Fire monitoring system

Abstract

To provide a fire detector comprising a window plate of a material which is different for each light-receiving element.SOLUTION: A window plate part (2) of a fire sensor comprises: a window material base (21) in which an upper opening and a lower opening are formed; an annular reflector (22) which is mounted in the front side of the window material base (21); a glass window plate (23) which is mounted in the back side of the window material base (21) so as to cover the upper opening of the window material base (21); and a silicon window plate (24) which is mounted in the back side of the window material base (21) so as to cover the lower opening of the window material base (21). The glass window plate (23) of the window plate part (2) is a window plate for a photodiode, and the silicon window plate (24) is a window plate for a two-wavelength thermopile (35).SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a fire monitoring system. [Background technology]

[0002] Three-wavelength flame detectors have been known for detecting flames in large spaces such as factories, cultural properties, and atriums. For example, Patent Document 1 describes a flame detector equipped with a two-wavelength thermopile and a photodiode. The two-wavelength thermopile of this flame detector consists of a first element and a second element, with the first element having detection sensitivity in the medium wavelength band and the second element having detection sensitivity in the long wavelength band. Meanwhile, the photodiode has detection sensitivity in the short wavelength band. This flame detector finds a heat source based on the output of the first element, detects a flame based on the output ratio between the first and second elements, and distinguishes between a flame and a false alarm source based on the output ratio between the first element and the photodiode. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-160021 Summary of the Invention [Problem to be solved by the invention]

[0004] The dual-wavelength thermopile and photodiode in the flame detector described above have different detection wavelengths, so they need to be covered with window plates made of different materials. For example, the dual-wavelength thermopile needs to be covered with a silicon window plate, and the photodiode needs to be covered with a glass window plate.

[0005] The present invention has been made in view of the above circumstances, and has as its object to provide a flame detector having window plates made of different materials for each light receiving element. [Means for solving the problem]

[0006] In order to solve the above problems, the flame detector of the present invention comprises a housing having a front plate in which a light receiving window is formed, a plate-shaped window material base having a first opening and a second opening and fixed with double-sided tape to the back surface of the front plate so that the first opening and the second opening face the light receiving window, a first window plate fixed with double-sided tape to the back surface of the window material base so as to cover the first opening, and a second window plate made of a different material from the first window plate and fixed with double-sided tape to the back surface of the window material base so as to cover the second opening. a circuit board accommodated in the housing and arranged approximately parallel to the front plate; an element support base fixed to the front of the circuit board; a first light-receiving element supported by the element support base so as to face the first window plate and connected to the circuit board across the element support base; and a second light-receiving element supported by the element support base so as to face the second window plate and connected to the circuit board across the element support base, the second light-receiving element having detection sensitivity in a wavelength band different from that of the first light-receiving element. [Effects of the Invention]

[0007] The present invention provides a flame detector having a window plate made of a different material for each light receiving element. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of a flame detector 100 according to a first embodiment; [Figure 2] 1 is a front view of a flame detector 100 according to a first embodiment; [Figure 3] 1 is a side view of a flame detector 100 according to a first embodiment; [Figure 4] 1 is a rear view of the flame detector 100 according to the first embodiment; [Figure 5] 1 is an exploded perspective view of a flame detector 100 according to a first embodiment; [Figure 6] FIG. 1 is a front view of a window panel portion 2 according to a first embodiment; [Figure 7] 1 is a rear view of the window panel portion 2 according to the first embodiment; [Figure 8] FIG. 1 is an exploded perspective view of a window panel 2 according to a first embodiment. [Figure 9] Cross section of line AA in Figure 6 [Figure 10] FIG. 1 is an exploded perspective view of a circuit board 3 according to a first embodiment. [Figure 11] FIG. 1 is a front view of an element holder 32 according to a first embodiment; [Figure 12] 1 is a rear view of the element holder 32 according to the first embodiment; [Figure 13] Cross section of line BB in Figure 11 [Figure 14] Cross section of line CC in Figure 11 [Figure 15] FIG. 1 is a front view of an element holder 32 that accommodates a dirt detection LED 33 and the like according to the first embodiment; [Figure 16] Cross section of line DD in Figure 15 [Figure 17] Cross section of Figure 2, line EE [Figure 18] A diagram showing the relative sensitivity spectrum of the two-wavelength thermopile 35 and the photodiode 34. [Figure 19] A diagram showing the spectral characteristics of the fire and the source of the false alarm. [Figure 20] FIG. 6 is a diagram showing the configuration of a fire monitoring system 600 according to a second embodiment. [Figure 21] 10 is a perspective view of a detector 7 according to a second embodiment. [Figure 22] FIG. 10 is a front view of a detector 7 according to a second embodiment. [Figure 23] 10 is a block diagram of the internal configuration of a detector 7 according to a second embodiment. [Figure 24] Cross section of line AA in Figure 22 [Figure 25] Front view of the alarm panel 6 according to the second embodiment [Figure 26] Block diagram of the internal configuration of an alarm panel 6 according to a second embodiment DETAILED DESCRIPTION OF THE INVENTION

[0009] 1. First embodiment 1-1.Configuration A flame detector 100 according to a first embodiment of the present invention will be described with reference to the drawings. The flame detector 100 according to this embodiment is a three-wavelength flame detector. This flame detector 100 includes a two-wavelength thermopile and a photodiode, and detects the occurrence of a flame while distinguishing between a flame and a false alarm source based on the outputs of these light-receiving elements.

[0010] 1 to 5 are a perspective view, a front view, a side view, a rear view, and an exploded perspective view of this flame detector 100. As shown in FIG. 5, this flame detector 100 is made up of a protective cover 1, a window plate 2, a circuit board 3, and a rear cover 4. The protective cover 1 and rear cover 4 of this flame detector 100 form a housing by attaching the rear cover 4 to the rear of the protective cover 1. The window plate 2 and the circuit board 3 are housed in the housing made up of this protective cover 1 and rear cover 4. Each of the components of this flame detector 100 will be described below.

[0011] First, protective cover 1 has a substantially rectangular cup shape. As shown in Fig. 1 etc., protective cover 1 is composed of a circular front plate 11 and a peripheral wall 12 that curves and rises substantially vertically from the periphery of front plate 11. A light receiving window 111 with a rounded rectangular shape is formed in the center of front plate 11 of protective cover 1.

[0012] Next, the window panel portion 2 will be described. 6 to 8 are a front view, a back view, and an exploded perspective view of the window panel 2. FIG. 9 is a cross-sectional view taken along line AA in FIG. 6. Note that hatching has been omitted in FIG. 9. The window panel 2 shown in these figures is a component for closing the light receiving window 111 of the protective cover 1 from the back side. As shown in FIG. 8, this window panel 2 is made up of a window material base 21, a reflector 22, a glass window panel 23, a silicon window panel 24, and double-sided tapes 25 to 27. Each component of this window panel 2 will be described below.

[0013] 8, the window material base 21 is a substantially circular plate. The window material base 21 has an upper opening 211 formed at the upper center, a lower opening 212 formed at the lower center, and three sets of protrusions 213 protruding from the outer periphery. The upper opening 211 of the window material base 21 is an opening for allowing a photodiode 34, which will be described later, to receive light, and the lower opening 212 is an opening for allowing a dual-wavelength thermopile 35, which will be described later, to receive light.

[0014] As shown in Fig. 9, the upper opening 211 is formed by communication between a front-side recess 2111 formed on the front side of the window material base 21 and a back-side recess 2112 formed on the back side of the window material base 21. As shown in Fig. 8, the front-side recess 2111 of this upper opening 211 has a shape that combines a semicircle and a rectangle, and its diameter increases toward the front side. On the other hand, the back-side recess 2112 is circular, as shown in Fig. 7.

[0015] The shape of the semicircular portion of the front recess 2111 is determined in consideration of the visibility of the green LED 311 and the red LED 312 seen through the front recess 2111, the arrangement of the stain detection LED 33 seen through the front recess 2111, and ease of processing. On the other hand, the shape of the rectangular portion is determined in consideration of the field of view of fire monitoring by the photodiode 34.

[0016] As shown in Fig. 9, the lower opening 212 is formed by communication between a front-side recess 2121 formed on the front side of the window material base 21 and a back-side recess 2122 formed on the back side of the window material base 21. As shown in Fig. 8, the front-side recess 2121 of this lower opening 212 is a square with rounded corners, and the diameter increases toward the front side. On the other hand, the back-side recess 2122 is circular, as shown in Fig. 7.

[0017] The three sets of protrusions 213 are provided at equal intervals on the outer periphery of the window material base 21. These three sets of protrusions 213 are members for engaging with three protrusions (not shown) provided on the back surface of the front plate 11 when attaching the window panel 2 to the protective cover 1. The window panel 2 is positioned relative to the protective cover 1 by engaging the three sets of protrusions 213 with the three protrusions.

[0018] Next, as shown in Fig. 8, the reflector 22 is a substantially annular plate. The reflector 22 has a rounded rectangular opening 221 and a substantially semicircular protruding portion 222 formed by bending part of the inner periphery of the opening 221. The opening 221 of the reflector 22 is an opening for receiving light into the photodiode 34 and the dual-wavelength thermopile 35. On the other hand, the protruding portion 222 is a portion for reflecting light emitted from the soiling detection LED 33, which will be described later.

[0019] The double-sided tape 25 has a substantially circular ring shape, as shown in Fig. 8. The double-sided tape 25 is a member for attaching the reflector 22 to the window material base 21. As shown in Figs. 6 and 8, the front side of the double-sided tape 25 (particularly its inner peripheral edge) is attached along the inner peripheral edge of the back side of the reflector 22, and the back side is attached along the outer peripheral edge of the front side of the window material base 21.

[0020] 6, the reflector 22 attached to the window material base 21 with this double-sided tape 25 has its opening 221 overlapping the upper opening 211 and lower opening 212 of the window material base 21 in a front view. In addition, the protruding portion 222 overlaps the upper opening 211 of the window material base 21 in a front view.

[0021] Next, the glass window plate 23 is a circular plate, as shown in Fig. 8. This glass window plate 23 is a window plate for a photodiode 34, which will be described later.

[0022] As shown in Figure 8, the double-sided tape 26 has a substantially circular ring shape. This double-sided tape 26 is a member for attaching the glass window pane 23 to the window material base 21. More specifically, it is a member for fixing the glass window pane 23 fitted into the rear-side recess 2112 of the window material base 21. As shown in Figures 8 and 9, the front side of this double-sided tape 26 is attached to the bottom of the rear-side recess 2112 of the window material base 21 along its outer periphery, and the back side is attached along the front-side outer periphery of the glass window pane 23.

[0023] The silicon window plate 24 is a circular plate, as shown in Fig. 8. This silicon window plate 24 is a window plate for a two-wavelength thermopile 35, which will be described later.

[0024] As shown in Figure 8, the double-sided tape 27 has a substantially circular ring shape. This double-sided tape 27 is a member for attaching the silicon window plate 24 to the window material base 21. More specifically, it is a member for fixing the silicon window plate 24 fitted into the rear surface side recess 2122 of the window material base 21. As shown in Figures 8 and 9, the front side of this double-sided tape 27 is attached to the bottom of the rear surface side recess 2122 of the window material base 21 along its outer periphery, and the back side is attached along the front surface side outer periphery of the silicon window plate 24. The above is a description of the components of the window panel portion 2.

[0025] The window panel 2 described above is attached to the protective cover 1 as shown in Figures 2 and 5. More specifically, the double-sided tape 25 (particularly the outer peripheral edge on the front side) of the window panel 2 is attached to the back surface of the front plate 11, thereby attaching the window panel 2 to the protective cover 1. As shown in Figure 2, the upper opening 211 and lower opening 212 of the window panel 2 attached to the protective cover 1 overlap with the light receiving window 111 of the protective cover 1 in a front view. In other words, the upper opening 211 and the lower opening 212 face the light receiving window 111. Furthermore, the protruding portion 222 overlaps with the light receiving window 111 of the protective cover 1 in a front view. Furthermore, the reflector 22 is arranged to surround the light receiving window 111.

[0026] In the window panel 2 described above, each component is attached to the window material base 21 using double-sided tapes 25 to 27. The window panel 2 is also attached to the protective cover 1 using double-sided tape 25. Using these double-sided tapes 25 to 27 makes the assembly work of the flame detector 100 easier than when, for example, an adhesive is used.

[0027] Next, the circuit board 3 will be described. 10 is an exploded perspective view of the circuit board 3. As shown in the figure, the circuit board 3 is composed of a printed circuit board 31, an element holder 32, a contamination detection LED 33, a photodiode 34, a two-wavelength thermopile 35, a shield case 36, a connector 37, and lead wires 38. Each component of the circuit board 3 will be described below.

[0028] 10, the printed circuit board 31 has a square shape with four corners cut out. A green LED 311 and a red LED 312 are arranged side by side slightly above the center of the printed circuit board 31. In addition, a microprocessor 313 (not shown) is mounted on the printed circuit board 31.

[0029] 10, the element holder 32 has a substantially rectangular parallelepiped shape. The element holder 32 is a support base for supporting the contamination detection LED 33, the photodiode 34, and the dual-wavelength thermopile 35. The element holder 32 is made of a translucent resin material containing a light diffusing agent such as silica or calcium carbonate in order to diffuse and transmit the light emitted from the green LED 311 and the red LED 312.

[0030] 11 and 12 are a front view and a rear view of the element holder 32. FIG. 13 is a cross-sectional view taken along line BB in FIG. 11, and FIG. 14 is a cross-sectional view taken along line CC in FIG. 11. Hatching is omitted in FIGS. 13 and 14. The element holder 32 shown in these figures is composed of a substantially rectangular plate body 321, first to fifth recesses 322 to 326 formed on the front side of the plate body 321, and first to third peripheral walls 327 to 329 formed on the rear side of the plate body 321. Each component of the element holder 32 will be described below.

[0031] First, the first to third recesses 322 to 324 are formed side by side at the center of the plate body 321 in the short side direction, as shown in Fig. 11 and Fig. 13. Of these recesses, the first recess 322 is a recess for accommodating the soil detection LED 33. As shown in Fig. 13, an insertion hole 3222 for inserting the leg of the soil detection LED 33 is formed in the bottom plate 3221 of the first recess 322. The leg of the soil detection LED 33 inserted into the insertion hole 3222 is connected to the printed circuit board 31.

[0032] The second recess 323 is a recess for accommodating the photodiode 34. A bottom plate 3231 of the second recess 323 is formed with an insertion hole 3232 for inserting the leg of the photodiode 34. The leg of the photodiode 34 inserted into the insertion hole 3232 is connected to the printed circuit board 31.

[0033] The third recess 324 is a recess for accommodating the dual-wavelength thermopile 35. A bottom plate 3241 of the third recess 324 is formed with insertion holes 3242 for inserting the legs of the dual-wavelength thermopile 35. The legs of the dual-wavelength thermopile 35 inserted into the insertion holes 3242 are connected to the printed circuit board 31.

[0034] 11 and 14, the fourth recess 325 and the fifth recess 326 are rectangular and are formed side by side between the first recess 322 and the second recess 323. Of these recesses, the fourth recess 325 has a first bottom plate 3251. On the other hand, the fifth recess 326 has a second bottom plate 3261.

[0035] 12 and 13, the first peripheral wall 327 is formed to surround the bottom plate 3231 of the second recess 323. The first peripheral wall 327 surrounds the legs of the photodiode 34 housed in the second recess 323.

[0036] 12 and 13, the second peripheral wall 328 is formed to surround the bottom plate 3241 of the third recess 324. The second peripheral wall 328 surrounds the legs of the dual-wavelength thermopile 35 housed in the third recess 324.

[0037] Next, the third peripheral wall 329 is formed along the outer periphery of the plate body 321, as shown in FIG.

[0038] 5, the element holder 32 described above is screwed to the center of the front side of the printed circuit board 31. In addition, the element holder 32 accommodates a contamination detection LED 33, a photodiode 34, and a two-wavelength thermopile 35.

[0039] Fig. 15 is a front view of an element holder 32 that is screwed to a printed circuit board 31 and that houses an LED 33 for detecting soiling and the like. Fig. 16 is a cross-sectional view taken along line DD in Fig. 15. Note that hatching is omitted in Fig. 16.

[0040] The first to third recesses 322 to 324 of the element holder 32 shown in these figures respectively house a soiling detection LED 33, a photodiode 34, and a two-wavelength thermopile 35. The legs of the sensor elements housed in these recesses are each connected to the printed circuit board 31.

[0041] Moreover, the first bottom plate 3251 of the element holder 32 shown in the same figure overlaps with the green LED 311 in a front view. This first bottom plate 3251 transmits while diffusing the light emitted by the green LED 311, improving the visibility of the light. Moreover, the second bottom plate 3261 of the element holder 32 shown in the same figure overlaps with the red LED 312 in a front view. This second bottom plate 3261 transmits while diffusing the light emitted by the red LED 312, improving the visibility of the light.

[0042] Next, the shield case 36 will be described. As shown in FIG. 10, the shield case 36 has a box shape with a bottom and no lid, and is attached to the rear surface of the printed circuit board 31.

[0043] 10, the connector 37 has a substantially rectangular parallelepiped shape and is attached to the rear surface of the printed circuit board 31. To this connector 37, a lead wire 38 is connected. The components of the circuit board 3 have been described above.

[0044] The circuit board 3 described above is screwed to the protective cover 1 and housed between the protective cover 1 and the rear cover 4, as shown in Fig. 5. The circuit board 3 is disposed approximately parallel to the front plate 11 of the protective cover 1.

[0045] Fig. 17 is a cross-sectional view taken along line EE in Fig. 2. However, for ease of explanation, Fig. 17 only shows the window panel portion 2 and the circuit board 3. Furthermore, hatching is omitted in Fig. 17.

[0046] 17, the green LED 311, red LED 312 (not shown), contamination detection LED 33, and photodiode 34 of the circuit board 3 overlap (in other words, face) the glass window pane 23 of the window pane unit 2 in a front view. In particular, the contamination detection LED 33 also overlaps with the reflector 22 of the window pane unit 2 in a front view. Light emitted from the contamination detection LED 33 passes through the glass window pane 23 and is reflected by the reflector 22, as indicated by the two-dot chain arrow. The reflected light passes through the glass window pane 23 again and is received by the photodiode 34. The output of the photodiode 34 that receives this reflected light indicates the transmittance of the glass window pane 23 (in other words, the degree of contamination).

[0047] As shown in FIG. 17, the two-wavelength thermopile 35 of the circuit board 3 overlaps (in other words, faces) the silicon window plate 24 of the window plate portion 2 in a front view.

[0048] In addition, as shown in FIG. 2, the green LED 311, red LED 312, contamination detection LED 33, photodiode 34, and dual-wavelength thermopile 35 of the circuit board 3 overlap the light receiving window 111 of the protective cover 1 in a front view.

[0049] Next, the rear cover 4 will be described. 4 and 5, the rear cover 4 is a square plate with four corners cut out. The rear cover 4 has a rectangular wiring hole 41 with rounded corners formed in the center. The lead wires 38 are drawn out from the wiring hole 41.

[0050] As shown in FIG. 5, the rear cover 4 is screwed to the rear surface of the protective cover 1 with a gasket 5 sandwiched therebetween.

[0051] According to the above-described configuration, it is possible to use window plates made of different materials for each light receiving element.

[0052] 1-2.Operation Next, the operation of the flame detector 100 will be described. The microprocessor 313 mounted on the flame detector 100 executes three processes: fire determination, contamination determination, and malfunction determination. These three processes will be described below.

[0053] First, the fire determination will be described. The microprocessor 313 performs fire detection based on the outputs of the photodiode 34 and the dual-wavelength thermopile 35. Of the sensor elements used for this fire detection, the dual-wavelength thermopile 35 is composed of a first element TP1 and a second element TP2.

[0054] 18 is a diagram showing the relative sensitivity spectra of the dual-wavelength thermopile 35 and the photodiode 34. As shown in the figure, the first element TP1 of the dual-wavelength thermopile 35 has detection sensitivity in the medium wavelength band. More specifically, it has detection sensitivity to wavelengths equal to or greater than 1.2 μm and less than 8.0 μm. The second element TP2 of the dual-wavelength thermopile 35 has detection sensitivity in the long wavelength band. More specifically, it has detection sensitivity to wavelengths equal to or greater than 8.0 μm. The photodiode (PD) 34 has detection sensitivity in the short wavelength band. More specifically, it has detection sensitivity to wavelengths less than 1.2 μm.

[0055] The microprocessor 313 monitors the outputs of these three sensor elements and determines that a fire has occurred when all of the following three conditions are met: (1) The output (TP1) of the first element TP1 is equal to or greater than the threshold value Th1. (2) The output ratio (TP1 / TP2) between the first element TP1 and the second element TP2 is equal to or greater than the threshold value Th2. (3) The output ratio (TP1 / PD) of the first element TP1 to the photodiode 34 is equal to or greater than a threshold value Th3.

[0056] Figure 19 shows the spectral characteristics of fires to be detected and sources of false alarms. Of the heat sources shown in the figure, the heptane fire is the target of detection, while the other sources, sunlight, a xenon lamp, and a 100°C high-temperature object, are sources of false alarms.

[0057] Of these heat sources, the heptane fire has a high relative intensity in the mid-wavelength band and a low relative intensity in the short-wavelength and long-wavelength bands. Therefore, the output of the first element TP1, which has detection sensitivity in the mid-wavelength band, is high, while the output of the second element TP2, which has detection sensitivity in the long-wavelength band, and the output of the photodiode 34, which has detection sensitivity in the short-wavelength band, are low. As a result, TP1, TP1 / TP2, and TP1 / PD all have high values.

[0058] Sunlight and xenon lamps have high relative intensities in the short wavelength band and low relative intensities in the medium and long wavelength bands. Therefore, the output of photodiode 34, which has detection sensitivity in the short wavelength band, is high, while the outputs of first element TP1, which has detection sensitivity in the medium wavelength band, and second element TP2, which has detection sensitivity in the long wavelength band, are low. As a result, TP1 and TP1 / PD are low, and TP1 / TP2 is high.

[0059] A 100°C high-temperature object has high relative intensity in the long wavelength band and low relative intensity in the short and medium wavelength bands. Therefore, the output of the second element TP2, which has detection sensitivity in the long wavelength band, is high, while the output of the photodiode 34, which has detection sensitivity in the short wavelength band, and the output of the first element TP1, which has detection sensitivity in the medium wavelength band, are low. As a result, TP1 and TP1 / TP2 are low, and TP1 / PD is high.

[0060] As explained above, in heptane fires, TP1, TP1 / TP2, and TP1 / PD all have high values. In contrast, in sunlight and xenon lamps, TP1 / TP2 has high values, but TP1 and TP1 / PD have low values. Therefore, by setting the TP1 threshold Th1 and the TP1 / PD threshold Th3 to values ​​between heptane fires and sunlight, etc., it is possible to distinguish heptane fires from sunlight, etc. Furthermore, unlike heptane fires, for 100°C high-temperature objects, TP1 / PD has high values, but TP1 and TP1 / TP2 have low values. Therefore, by setting the TP1 threshold Th1 and the TP1 / TP2 threshold Th2 to values ​​between heptane fires and 100°C high-temperature objects, it is possible to distinguish heptane fires from 100°C high-temperature objects.

[0061] When the microprocessor 313 determines that all three of the above conditions are met and that a fire has occurred, it turns on the red LED 312. In addition, it outputs an alarm signal to a device connected to the flame detector 100. This concludes the explanation of fire detection.

[0062] Next, the contamination determination will be described. The microprocessor 313 periodically causes the contamination detection LED 33 to emit light and determines whether the output of the photodiode 34 that receives that light exceeds a threshold. If the result of this determination is that the output of the photodiode 34 is below the threshold (in other words, if the transmittance of the glass window pane 23 is below the threshold), the microprocessor 313 causes the green LED 311 to blink. In addition, the microprocessor 313 outputs a contamination detection signal to a device connected to the flame detector 100.

[0063] Next, the fault determination will be described. The microprocessor 313 monitors the components of the flame detector 100 for failures, and if it determines that a failure has occurred, it blinks the red LED 312. In addition, it outputs a failure signal to a device connected to the flame detector 100.

[0064] 2. Variations The first embodiment described above may be modified as follows: In addition, the following modifications may be combined with each other.

[0065] 2-1. Variation 1 1 and the like is merely an example, and other shapes may be used as long as they can accommodate the window panel portion 2 and the circuit board 3. Furthermore, the shape of the printed circuit board 31 accommodated in the housing may also be changed in accordance with the deformation of the housing.

[0066] Furthermore, the shape of the light receiving window 111 shown in FIG. 1 etc. is merely an example, and other shapes may be used as long as the photodiode 34 and the two-wavelength thermopile 35 can receive light.

[0067] 2-2. Variation 2 The reflector 22, the glass window plate 23 and the silicon window plate 24 may be attached to the window material base 21 by means other than double-sided tape (for example, adhesive).

[0068] 2-3. Variation 3 8 and the like is merely an example, and other shapes may be used as long as they are capable of fixing the glass window plate 23 and the silicon window plate 24. Furthermore, as the window material base 21 is deformed, the shapes of the reflector 22, glass window plate 23, and silicon window plate 24 fixed to the window material base 21 may also be changed.

[0069] 2-4. Variation 4 The glass window plate 23 and the silicon window plate 24 are merely examples of window plates that can be used. Instead of these window plates, window plates made of sapphire glass or germanium may also be used.

[0070] 2-5. Variation 5 The shape of the element holder 32 shown in FIG. 10 and other figures is merely an example, and other shapes may be used as long as they can support the dirt detection LED 33, the photodiode 34, and the two-wavelength thermopile 35.

[0071] 2-6. Variation 6 The photodiode 34 and the two-wavelength thermopile 35 are merely examples of usable light receiving elements. Instead of these light receiving elements, a one-wavelength thermopile or a pyroelectric sensor may be used.

[0072] 3. Second embodiment A fire monitoring system 600 according to a second embodiment of the present invention will be described with reference to the drawings. 20 is a diagram showing the configuration of this fire monitoring system 600. The fire monitoring system 600 shown in the figure is made up of an alarm panel 6 and a plurality of detectors 7.

[0073] Five detectors 7 (in other words, five systems) are connected by wire to the alarm panel 6 of this fire monitoring system 600. Of the five detectors 7, only the detectors 7 for the first and fifth lines are shown in Fig. 20, and the detectors 7 for the second to fourth lines are not shown.

[0074] Furthermore, five detectors 7 are connected to each circuit by a feeder wiring to this alarm panel 6. Of the five detectors 7, only the first and fifth detectors 7 are shown in Figure 20, and the second to fourth detectors 7 are not shown.

[0075] As shown in Fig. 20, the alarm panel 6 has an I+ terminal, an I- terminal, a C terminal, five L terminals, a DC terminal, and five DA terminals. On the other hand, the detector 7 has an I+ terminal, an I- terminal, a C terminal, an L terminal, two DC terminals, and two DA terminals.

[0076] The I+ terminal of the alarm panel 6 is connected to the I+ terminals of five detectors 7 for each line. The I- terminal of the alarm panel 6 is connected to the I- terminals of five detectors 7 for each line. The C terminal of the alarm panel 6 is connected to the C terminals of five detectors 7 for each line. The five L terminals of the alarm panel 6 are each connected to the L terminals of five detectors 7 for different lines. The DC terminal of the alarm panel 6 is connected to the DC terminals of five detectors 7 for each line. The five DA terminals of the alarm panel 6 are each connected to the DA terminals of five detectors 7 for different lines.

[0077] The C terminal and L terminal of the fifth detector 7 on each line are connected by a terminating resistor, and the DC terminal and DA terminal of the fifth detector 7 on each line are short-circuited. Each component of the fire monitoring system 600 will now be described.

[0078] First, the detector 7 will be described. Detector 7 is a three-wavelength flame detector. This detector 7 includes a photodiode and a two-wavelength thermopile, and detects the occurrence of a flame while distinguishing between a flame and a false alarm source based on the outputs of these light-receiving elements. In one example, detector 7 has a configuration similar to that of flame detector 100 according to the first embodiment.

[0079] 21 and 22 are a perspective view and a front view of this detector 7. As shown in these figures, this detector 7 includes a substantially rectangular parallelepiped housing 701, a reflector 702 that covers part of a light receiving window 7011 of the housing 701, and a soiling detection LED 703, a photodiode 704, a two-wavelength thermopile 705, a green LED 706, and a red LED 707 that are housed in the housing 701 and face the light receiving window 7011.

[0080] 23 is a block diagram of the internal configuration of this detector 7. As shown in the figure, this detector 7 is equipped with a soiling detection LED 703, a photodiode 704, a two-wavelength thermopile 705, an indicator light circuit 708, an alarm output circuit 709, an abnormality output circuit 710, an internal power supply 711, and a microprocessor 712. Each component of this detector 7 will be described below.

[0081] First, the soiling detection LED 703 is a near-infrared LED, and is used for soiling determination, which will be described later.

[0082] The photodiode 704 is a photodiode that is sensitive in the visible and near-infrared regions, and is used for fire detection and contamination detection, which will be described later.

[0083] The two-wavelength thermopile 705 is composed of a first element TP1 and a second element TP2, each of which has different spectral characteristics. This two-wavelength thermopile 705 is used to determine fires, which will be described later.

[0084] The relative sensitivity spectrum of this two-wavelength thermopile 705 and photodiode 704 is the same as that explained in the first embodiment, and therefore the explanation thereof will be omitted.

[0085] Next, the indicator light circuit 708 has the above-mentioned green LED 706 and red LED 707, and is a circuit for controlling the light emission of these indicator lights. Of the indicator lights controlled by this indicator light circuit 708, the green LED 706 is an abnormality light that notifies of contamination of the light receiving window 7011. On the other hand, the red LED 707 is an abnormality light that notifies of a malfunction of a component of the detector 7, and is also an alarm light that notifies of the occurrence of a fire.

[0086] The alarm output circuit 709 is a circuit for short-circuiting the C terminal and L terminal, which are normally open, to send an alarm signal to the alarm panel 6. In addition, this alarm output circuit 709 has a recovery detection function, and when a recovery signal is sent by the alarm panel 6 cutting off the voltage between the C terminal and the L terminal, the circuit detects the recovery signal.

[0087] The abnormality output circuit 710 is a circuit for transmitting an abnormality signal to the alarm panel 6 by opening the DC terminal and DA terminal that are short-circuited under normal conditions.

[0088] The internal power supply 711 is connected to the I+ terminal and the I- terminal, and receives power from the alarm panel 6 via these terminals.

[0089] The microprocessor 712 executes a program stored in a memory (not shown) to perform five processes: fire detection, contamination detection, failure detection, recovery operation, and mode switching. These five processes will be described below.

[0090] First, the fire determination will be described. The microprocessor 712 judges whether a fire has occurred based on the outputs of the photodiode 704 and the two-wavelength thermopile 705. The specific method of judging whether a fire has occurred is the same as that described in the first embodiment, and therefore will not be described again. When the microprocessor 712 judges that all of the above three conditions are met and that a fire has occurred, it controls the indicator light circuit 708 to turn on the red LED 707. The red LED 707 remains lit until a recovery signal is received from the alarm panel 6. The microprocessor 712 also controls the alarm output circuit 709 to send an alarm signal to the alarm panel 6. The transmission of this alarm signal is stopped after about five seconds to prevent the temperature of the circuit board on the alarm panel 6 side from rising.

[0091] Next, the contamination determination will be described. Before explaining the contamination determination, the contamination detection mechanism will be explained first. Fig. 24 is a cross-sectional view taken along line AA in Fig. 22. However, in Fig. 24, for ease of explanation, the housing 701 is not shown, and hatching is also omitted in the figure.

[0092] 24, the soiling detection LED 703 and photodiode 704 of the detector 7 are covered by a glass window plate 713. In particular, the soiling detection LED 703 is covered by a reflector 702 in addition to the glass window plate 713. As indicated by the two-dot chain arrow, light emitted from the soiling detection LED 703 passes through the glass window plate 713 and is then reflected by the reflector 702. The reflected light passes through the glass window plate 713 again and is received by the photodiode 704. The output of the photodiode 704 that receives this reflected light indicates the transmittance of the glass window plate 713 (in other words, the degree of soiling).

[0093] 24, the dual-wavelength thermopile 705 of the detector 7 is covered with a silicon window plate 714. Since the dual-wavelength thermopile 705 has a different detection wavelength from the photodiode 704, it is covered with a window plate made of a different material from that of the photodiode 704.

[0094] The microprocessor 712 performs a contamination determination using the contamination detection mechanism described above. Specifically, it periodically causes the contamination detection LED 703 to emit light, and determines whether the output of the photodiode 704 that receives the light exceeds a threshold. If the output of the photodiode 704 is found to be below the threshold (in other words, if the transmittance of the glass window pane 713 is below the threshold), it controls the indicator light circuit 708 to blink the green LED 706 at one-second intervals. This blinking of the green LED 706 continues until the contamination is resolved. The microprocessor 712 also controls the abnormality output circuit 710 to send an abnormality signal to the alarm panel 6. This transmission of the abnormality signal continues until the contamination is resolved.

[0095] Note that the microprocessor 712 stops flashing the green LED 706 if it determines that a fire has occurred, even before the detected contamination state is resolved. In addition, the microprocessor 712 stops sending the abnormality signal to the alarm panel 6. Specifically, the transmission of the abnormality signal to the alarm panel 6 is stopped by shorting the DC terminal and the DA terminal. As a result, only the red LED 707 is turned on in the detector 7, and only an alarm signal is sent to the alarm panel 6. By limiting the indicator light turned on in the detector 7 to only the red LED 707 in this way, the occurrence of a fire is more emphasized than when both the green LED 706 and the red LED 707 are turned on. This temporary release of the soiled state will continue until a restoration signal is received from the alarm panel 6.

[0096] Next, the fault determination will be described. The microprocessor 712 monitors the voltage value of the internal power supply 711 and the output values ​​of the photodiode 704 and the two-wavelength thermopile 705. If an abnormality is detected in either value, the microprocessor 712 controls the indicator light circuit 708 to blink the red LED 707 at one-second intervals. The red LED 707 continues to blink until the fault condition is resolved. The microprocessor 712 also controls the abnormality output circuit 710 to send an abnormality signal to the alarm panel 6. The transmission of this abnormality signal continues until the fault condition is resolved.

[0097] Note that if the microprocessor 712 determines that a fire has occurred, even before the detected fault condition is resolved, it stops flashing the red LED 707. In addition, it stops sending the abnormality signal to the alarm panel 6. Specifically, it stops sending the abnormality signal to the alarm panel 6 by short-circuiting the DC terminal and the DA terminal. As a result, the red LED 707 in the detector 7 lights up, and only an alarm signal is sent to the alarm panel 6. This temporary release of the fault state will continue until a recovery signal is received from the alarm panel 6.

[0098] Next, the recovery operation will be described. When the alarm output circuit 709 detects the restoration signal transmitted from the alarm panel 6, the microprocessor 712 controls the indicator light circuit 708 to turn off the red LED 707.

[0099] Next, mode switching will be described. This mode switching is a process for switching the operation mode of the detector 7 from the normal operation mode to the test acceptance mode. By performing this mode switching, the operation mode of the detector 7 is switched to the test acceptance mode, and the operation test of the detector 7 becomes possible.

[0100] An operation tester is used to test the operation of the detector 7. The operation tester is equipped with a krypton lamp and a light shielding plate with an aperture, and by appropriately setting the diameter of the aperture, it is possible to irradiate test light with a different spectral ratio from that of a flame.

[0101] In order to detect the test light of this operation tester, the microprocessor 712 of the detector 7 performs a fire judgment using the fire judgment conditions for the operation test in addition to the above fire judgment conditions only during the test acceptance mode. Then, if the fire judgment result shows that the fire judgment conditions for the operation test are met, the above-mentioned post-fire judgment processing is executed. Specifically, the red LED 707 is turned on and an alarm signal is sent to the alarm panel 6. Note that the microprocessor 712 performs a fire judgment using the above fire judgment conditions even during the test acceptance mode, and therefore can detect flames even during the test acceptance mode.

[0102] The microprocessor 712 automatically switches to the test reception mode for a predetermined time (for example, 60 seconds) after the detector 7 is powered on or after a recovery signal is received from the alarm panel 6. By timing the switch to the test reception mode after the detector 7 is powered on or after a recovery signal is received in this way, there is no need for a signal line to receive the mode switching signal from the alarm panel 6. In addition, there is no need for circuits in the detector 7 and alarm panel 6 to send and receive the mode switching signal. This concludes the description of the detector 7.

[0103] Next, the alarm panel 6 will be described. The alarm panel 6 is a device for displaying the status of the detector 7 for each line.

[0104] 25 is a front view of the alarm panel 6. As shown in the figure, the alarm panel 6 comprises a substantially rectangular parallelepiped housing 601, and five alarm area lights 602, five abnormality area lights 603, an alarm light 604, a 7-segment display 605, and a detector abnormality light 606 provided on the front of the housing 601. As shown in the figure, the alarm panel 6 also comprises other indicator lights, but as these indicator lights are not closely related to the main parts of this embodiment, their description will be omitted. For the same reason, the description of the operation buttons provided on the alarm panel 6 will also be omitted.

[0105] Figure 26 is a block diagram of the internal configuration of this alarm panel 6. As shown in the figure, this alarm panel 6 is equipped with a display circuit 607, an alarm receiving circuit 608, an abnormality receiving circuit 609, an audio circuit 610, and a microprocessor 611. Each component of this alarm panel 6 will be explained below.

[0106] First, the display circuit 607 has the five warning district lights 602, five abnormality district lights 603, warning light 604, 7-segment indicator 605, and detector abnormality light 606 described above, and is a circuit for controlling the light emission of these indicator lights (more specifically, LED indicator lights) and indicators. Of the indicator lights controlled by this display circuit 607, the five warning district lights 602 and warning light 604 are warning lights that notify the occurrence of a fire. On the other hand, the five abnormality district lights 603 and detector abnormality light 606 are abnormality lights that notify the occurrence of an abnormality in the detector 7. Note that an abnormality in the detector 7 referred to here means dirt on the light receiving window 7011 or a malfunction of a component.

[0107] The alarm receiving circuit 608 is a circuit for detecting an alarm signal transmitted by shorting the C terminal and L terminal in the detector 7. As described above, the alarm panel 6 has one L terminal for each line, so this alarm receiving circuit 608 detects alarm signals on a line-by-line basis. For example, if a short circuit occurs in the signal line between the C terminal and the L1 terminal, the alarm signal on the first line is detected. As another example, if a short circuit occurs in the signal line between the C terminal and the L5 terminal, the alarm signal on the fifth line is detected.

[0108] The abnormality receiving circuit 609 is a circuit for detecting an abnormality signal transmitted when the DC terminal and DA terminal are opened in the detector 7. As described above, the alarm panel 6 is provided with one DA terminal for each line, so this abnormality receiving circuit 609 detects abnormality signals on a line-by-line basis. For example, if an open circuit occurs in the signal line between the DC terminal and the DA1 terminal, the abnormality signal for the first line is detected. As another example, if an open circuit occurs in the signal line between the DC terminal and the DA5 terminal, the abnormality signal for the fifth line is detected.

[0109] The audio circuit 610 has a speaker (not shown) and is a circuit for controlling the output of the speaker.

[0110] The microprocessor 611 executes a program stored in a memory (not shown) to perform three processes: an alarm operation, an abnormality notification operation, and a recovery operation. These three processes will be described below.

[0111] First, the warning operation will be described. When an alarm signal is detected by the alarm receiving circuit 608, the microprocessor 611 controls the display circuit 607 to light up the alarm district light 602 of the line where the alarm signal was detected. The microprocessor 611 also controls the display circuit 607 to flash the alarm light 604 and display the line number on the 7-segment display 605. The microprocessor 611 also controls the audio circuit 610 to output an audio alarm from the speaker. As a result of these processes, it is possible to notify users of the occurrence of a fire and the area where it has occurred.

[0112] Next, the abnormality notification operation will be described. When an abnormal signal is detected by the abnormality receiving circuit 609, the microprocessor 611 controls the display circuit 607 to light up the abnormality area light 603 of the line where the abnormal signal was detected. The microprocessor 611 also controls the display circuit 607 to flash the detector abnormality light 606. The microprocessor 611 also controls the audio circuit 610 to output an abnormal sound from the speaker. As a result of these processes, it is possible to notify the user of the occurrence of an abnormality and the area in which it occurred.

[0113] As described above, if the detector 7 determines that a fire has occurred, it stops sending an abnormality signal to the alarm panel 6, even before the contamination or malfunction has been resolved. In response to this cancellation of the abnormality signal, the microprocessor 611 of the alarm panel 6 stops lighting the abnormality area light 603 and flashing the detector abnormality light 606, even before the contamination or malfunction has been resolved. As a result, the alarm panel 6 only lights up the alarm area light 602, flashes the alarm light 604, and displays the information on the 7-segment display 605. By limiting the indicator lights that are turned on on the alarm panel 6 to only the alarm indicator lights in this way, the occurrence of a fire is more emphasized than when both the abnormality indicator light and the alarm indicator light are turned on.

[0114] The above-mentioned abnormality area light 603 and the like are turned off even if the detector 7 that sent the abnormality signal is different from the detector 7 that sent the alarm signal. That is, when the microprocessor 611 of the alarm panel 6 receives an abnormality signal from detector 7A and receives an alarm signal from another detector 7B, even before the contamination or failure state in detector 7A is resolved, it stops the lighting of the abnormality area light 603 and the flashing of the detector abnormality light 606. As a result, the alarm panel 6 only lights up the alarm area light 602, flashes the alarm light 604, and displays the information on the 7-segment display 605. By limiting the indicator lights that are turned on on the alarm panel 6 to only the alarm indicator lights in this way, the occurrence of a fire is more emphasized than when both the abnormality indicator lights and the alarm indicator lights are turned on.

[0115] Next, the recovery operation will be described. When the recovery button (not shown) on the alarm panel 6 is pressed, the microprocessor 611 cuts off the voltage between the C terminal and the L terminal, thereby transmitting a recovery signal to all the detectors 7.

[0116] 4. Variations The second embodiment described above may be modified as follows: The following modifications may also be combined with each other.

[0117] 4-1. Variation 1 In the detector 7, the red LED 707 is turned on when a fire occurs and the red LED 707 is blinking when a malfunction occurs, but this may be reversed. That is, the red LED 707 may be blinked when a fire occurs and the red LED 707 may be turned on when a malfunction occurs.

[0118] Furthermore, in the detector 7, the green LED 706 flashes when contamination occurs, but instead, the green LED 706 may be lit.

[0119] Furthermore, the colors and blinking intervals of the green LED 706 and the red LED 707 are merely examples, and may be changed as appropriate depending on the facility in which the detector 7 is installed.

[0120] 4-2. Variation 2 In the alarm panel 6, when a fire occurs, the alarm area light 602 is turned on and the alarm light 604 is flashed, but instead, the alarm area light 602 may be flashed and the alarm light 604 may be turned on.

[0121] Furthermore, in the case of an abnormality occurring on the alarm panel 6, the abnormality area light 603 is turned on and the detector abnormality light 606 is made to flash, but instead, the abnormality area light 603 may be made to flash and the detector abnormality light 606 may be made to flash.

[0122] 4-3. Variation 3 In the fire monitoring system 600, if it is determined that a fire has occurred before the contamination of the detector 7 is resolved, the lit or flashing abnormal light is turned off in both the detector 7 and the alarm panel 6. However, it is not necessarily necessary to turn off the lit or flashing abnormal light in both devices, and the lit or flashing abnormal light may be turned off in only one of the devices.

[0123] 4-4. Variation 4 In the fire monitoring system 600, the alarm panel 6 and the detector 7 are connected by wire. However, instead of this, the two devices may be connected so as to be able to communicate wirelessly.

[0124] 4-5. Variation 5 Detector 7, which is a flame detector, is an example of a fire detector. A smoke detector or heat detector may be used instead of detector 7. Note that the smoke detector or heat detector referred to here is a detector that turns on its own alarm light and sends an alarm signal to the alarm panel 6 when it detects a fire, and flashes its own abnormality light and sends an abnormality signal to the alarm panel 6 when it detects an abnormality in its own device.

[0125] 4-6. Variation 6 As described above, the detector 7 turns on the red LED 707 in the event of a fire. As described above, the alarm panel 6 turns on the warning area light 602 and flashes the warning light 604 in the event of a fire. That is, the detector 7 and the alarm panel 6 use LED indicator lights to turn on and off the warning display. However, instead of LED indicator lights, the warning display may be turned on and off using an LCD. More specifically, the warning display may be turned on and off by displaying or hiding a warning light icon on the LCD.

[0126] As described above, the detector 7 flashes the green LED 706 when contamination occurs and flashes the red LED 707 when a malfunction occurs. As described above, the alarm panel 6 turns on the abnormality area light 603 and flashes the detector abnormality light 606 when an abnormality occurs. That is, the detector 7 and the alarm panel 6 use LED indicator lights to turn the abnormality indication on and off. However, instead of LED indicator lights, the abnormality indication may be turned on and off using an LCD. More specifically, the abnormality indication may be turned on and off by displaying or hiding an abnormality light icon on the LCD.

[0127] 4-7. Variation 7 As described above, the detector 7 stops the blinking of the green LED 706 when it determines that a fire has occurred, even before the detected contamination state is resolved. However, instead of stopping the blinking of the green LED 706, the brightness of the green LED 706 may be made lower than the brightness of the red LED 707. More specifically, the brightness of the green LED 706 may be reduced or the brightness of the red LED 707 may be increased. As another method, the blinking cycle of the green LED 706 may be made longer than the blinking cycle of the red LED 707. More specifically, the blinking cycle of the green LED 706 may be made longer or the blinking cycle of the red LED 707 may be made shorter. Alternatively, other display mode control may be used, such as emphasizing the alarm display mode more than the abnormality display mode. Such indicator light control may also be used to emphasize the occurrence of a fire.

[0128] As described above, when the alarm panel 6 receives an alarm signal from the detector 7, it stops the illumination of the abnormality area light 603 and the flashing of the detector abnormality light 606, even before the contamination or failure state of the detector 7 is resolved. However, instead of turning on the abnormality area light 603 and stopping the flashing of the detector abnormality light 606, the brightness of these indicator lights may be made lower than the brightness of the warning area light 602 and the warning light 604. More specifically, the brightness of these indicator lights may be lowered, or the brightness of the warning area light 602 and the warning light 604 may be increased. As another method, the flashing cycle of these indicator lights may be made longer than the flashing cycle of the warning area light 602 and the warning light 604. More specifically, the flashing cycle of these indicator lights may be made longer, or the flashing cycle of the warning area light 602 and the warning light 604 may be made shorter. Alternatively, other display mode control may be used to emphasize the alarm display mode more than the abnormality display mode. These indicator light controls can also highlight the occurrence of a fire. [Explanation of symbols]

[0129] 1...protective cover, 2...window plate portion, 3...circuit board, 4...back cover, 5...gasket, 11...front plate, 12...periphery wall, 21...window material base, 22...reflector, 23...glass window plate, 24...silicon window plate, 25-27...double-sided tape, 31...printed circuit board, 32...element holder, 33...fouling detection LED, 34...photodiode, 35...two-wavelength thermopile, 36...shield case, 37...connector, 38...lead wire, 1 00...flame detector, 111...light receiving window, 211...upper opening, 212...lower opening, 213...protrusion, 221...opening, 222...extending portion, 311...green LED, 312...red LED, 321...plate body, 322...first recess, 323...second recess, 324...third recess, 325...fourth recess, 326...fifth recess, 327...first peripheral wall, 328...second peripheral wall, 329...third peripheral wall, 2111, 2121...front recess, 2112, 2 122...rear recess, 3221, 3231, 3241...bottom plate, 3222, 3232, 3242...insertion hole, 3251...first bottom plate, 3261...second bottom plate, 6...alarm panel, 7...detector, 600...fire monitoring system, 601...casing, 602...alarm district light, 603...abnormal district light, 604...alarm light, 605...7-segment display, 606...detector abnormal light, 607...display circuit, 608...alarm receiving circuit, 609...abnormal receiving circuit, 6 10...acoustic circuit, 611...microprocessor, 701...casing, 702...reflector, 703...fouling detection LED, 704...photodiode, 705...two-wavelength thermopile, 706...green LED, 707...red LED, 708...indicator light circuit, 709...alarm output circuit, 710...abnormal output circuit, 711...internal power supply, 712...microprocessor, 713...glass window plate, 714...silicon window plate, 7011...light receiving window

Claims

1. A fire detector, an alarm panel communicably connected to the fire detector; Equipped with When the fire detector detects a fire, it turns on its own alarm display and transmits an alarm signal to the alarm panel, and when it detects an abnormality in the fire detector, it turns on its own abnormality display and transmits an abnormality signal to the alarm panel, When the fire detector detects a fire after detecting an abnormality in the device itself and the abnormality is not resolved, the fire detector turns off the abnormality display, or makes the brightness of the abnormality display lower than that of the alarm display, or makes the blinking cycle of the abnormality display longer than that of the alarm display. A fire monitoring system characterized by:

2. one or more fire detectors; an alarm panel communicably connected to the fire detector; Equipped with the one or more fire detectors transmit an alarm signal to the alarm panel when detecting a fire, and transmit an abnormality signal to the alarm panel when detecting an abnormality in the own device; The alarm panel turns on the alarm display of its own device when it receives the alarm signal, and turns on the abnormality display of its own device when it receives the abnormality signal, When a first fire detector included in the one or more fire detectors detects an abnormality in the device and the abnormality is not resolved, and the first fire detector or a second fire detector included in the one or more fire detectors detects a fire, the alarm panel turns off the abnormality indication, or makes the brightness of the abnormality indication lower than that of the alarm indication, or makes the blinking cycle of the abnormality indication longer than that of the alarm indication. A fire monitoring system characterized by:

3. 3. The fire monitoring system according to claim 1, wherein the fire detector switches its own operation mode from a normal operation mode to a test reception mode when it receives a recovery signal from the alarm panel.

4. 4. The fire monitoring system according to claim 3, wherein the fire detector performs a fire detection in the test acceptance mode using fire detection conditions for an operation test in addition to fire detection conditions for normal operation.

Images