Sulfur chemiluminescence detector

Abstract

A sulfur chemiluminescence detector comprises: a heating furnace (210) having a flow path extending left and right and having a gas flow path (211) whose end on the inlet side is inserted into the end on the outlet side of a column (140) of a gas chromatograph, and a heating unit (215) for heating the gas flow path; a reaction chamber (231) for reacting gas passing through the gas flow path with ozone; a light detector (233) for detecting light emitted from the reaction chamber; a shell (240) for accommodating the heating furnace, the reaction chamber and the light detector; and an interface (250) installed in a manner penetrating the wall surface of the shell and provided with a column passage (251) for the column (140) to penetrate and a heating unit (252) for heating the column passage (251), wherein the shell can keep the heating furnace in any state of a state in which the end on the inlet side of the gas flow path faces right or a state in which the end on the inlet side faces left, and the interface can be installed on any one of the right side wall (242) and the left side wall (243). Therefore, it can be applied to GC systems of various structures.

Description

Technical Field

[0001] The invention relates to a sulfur chemiluminescence detector. Background Art

[0002] A sulfur chemiluminescence detector (SCD) is a detector that can detect sulfur compounds in a sample with high sensitivity by utilizing chemiluminescence, and is generally used in combination with a gas chromatograph (GC) (see, for example, Patent Document 1).

[0003] The gas (sample gas) containing the sample components separated in the column of the GC is introduced into the heating furnace provided in the SCD. In the heating furnace, sulfur monoxide (SO) is generated from the sulfur compounds in the sample gas under the action of the redox reaction at high temperature. The SO is introduced into the reaction chamber in the SCD and mixed with ozone (O3) in the reaction chamber. As a result, the excited state substance (Japanese: excitation species) of sulfur dioxide (SO2*) is generated under the action of the reaction between SO and ozone. The luminescence intensity of the SO2* when it returns to the ground state through chemiluminescence is detected by the photodetector, and the sulfur compounds contained in the sample gas are quantified based on the luminescence intensity.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2015-59876 Summary of the invention

[0007] Problem that the invention aims to solve

[0008] Among the detectors used in GC, relatively small devices such as FID (Flame Ionization Detector) and TCD (Thermal Conductivity Detector) are installed on the top of the GC for use, but SCD is relatively large and is therefore installed next to the GC for use. However, there are cases where other relatively large detectors (such as mass spectrometers) and sample pretreatment devices (such as headspace samplers) are arranged next to the GC, and if the above devices are to be used together with the SCD, there will be restrictions on their arrangement.

[0009] For example, a mass spectrometer (MS) is generally arranged adjacent to the left side of a GC, so when the mass spectrometer (MS) is used together with an SCD, the SCD needs to be arranged adjacent to the right side of the GC (wherein, in this specification, the left side when facing the front of the GC is referred to as the left, and the right side when facing the front of the GC is referred to as the right for the following description). In addition, a sample pretreatment device is generally arranged adjacent to the right side of a GC, so when the sample pretreatment device is used together with an SCD, the SCD needs to be arranged adjacent to the left side of the GC.

[0010] Therefore, the following situation is considered, for example, for SCD, the manufacturer prepares two models in advance, a model that can be arranged at the right adjacent position of the GC and a model that can be arranged at the left adjacent position of the GC, and delivers an SCD of a model corresponding to the configuration of the GC system desired by the user (specifically, the type of equipment that the user wants to use with the SCD). However, in this case, the manufacturer needs to manufacture the SCD of the right-placed model and the SCD of the left-placed model separately, which has a problem of increased manufacturing cost.

[0011] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an SCD that can be applied to GC systems of various structures with one device.

[0012] Solutions for solving problems

[0013] The sulfur chemiluminescence detector (SCD) of the present invention, which has been made to solve the above-mentioned problems, is characterized by having:

[0014] A heating furnace including a gas flow path extending in the left and right directions and having an inlet-side end portion inserted into an outlet-side end portion of a column of a gas chromatograph, and a first heating unit for heating the gas flow path;

[0015] a reaction chamber that reacts the gas passing through the gas flow path of the heating furnace with ozone;

[0016] a light detector that detects light emitted from the reaction chamber;

[0017] a housing having at least a right side wall and a left side wall and accommodating the heating furnace, the reaction chamber, and the light detector; and

[0018] An interface having a column passage through which the column passes and a second heating unit for heating the column passage,

[0019] The shell can maintain the heating furnace in either a state where the end of the inlet side of the gas flow path faces right or left, and can install the interface on either the right wall or the left wall.

[0020] The sulfur chemiluminescence detector of the present invention is preferably:

[0021] The housing has: a first opening provided on the right side wall coaxially with the gas flow path of the heating furnace; and a second opening provided on the left side wall coaxially with the gas flow path.

[0022] The interface can pass through any one of the first opening and the second opening.

[0023] In addition, the sulfur chemiluminescence detector of the present invention is preferably,

[0024] The interface is selected from the group consisting of two interfaces having lengths different from each other.

[0025] Effects of the Invention

[0026] According to the sulfur chemiluminescence detector (SCD) of the present invention having the above-mentioned structure, it is possible to set the detector to two states: a state in which the end of the inlet side of the gas flow path of the heating furnace faces right and the interface is arranged on the right side wall of the housing, and a state in which the end of the inlet side faces left and the interface is arranged on the left side of the housing. Therefore, according to the above-mentioned SCD of the present invention, the SCD can be arranged at a right adjacent position of the gas chromatograph, and can also be arranged at a left adjacent position, so that one SCD can be applied to GC systems of various structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a front view showing the appearance of a GC system including an SCD according to an embodiment of the present invention.

[0028] Figure 2 It is a diagram showing the main structure of the SCD.

[0029] Figure 3 This is a front view schematically showing the internal structure of the GC and the SCD when the SCD is arranged on the left side of the GC.

[0030] Figure 4 It is a plan view schematically showing the internal structure of the GC and the SCD when the SCD is arranged on the left side of the GC.

[0031] Figure 5 It is a cross-sectional view showing the structure of the SCD and the vicinity of the heating furnace when the SCD is arranged on the left side of the GC.

[0032] Figure 6 It is a front view schematically showing the internal structure of the GC and the SCD when the SCD is arranged on the right side of the GC.

[0033] Figure 7 It is a plan view schematically showing the internal structure of the GC and the SCD when the SCD is arranged on the right side of the GC.

[0034] Figure 8 It is a cross-sectional view showing the structure of the SCD and its vicinity when the SCD is arranged on the right side of the GC.

[0035] Fig. 9 It is a plan view showing a structure in which the SCD including a detachable side panel is placed on the left.

[0036] Fig.10 It is a plan view showing a structure when the SCD including a detachable side panel is placed on the right. DETAILED DESCRIPTION

[0037] Hereinafter, a configuration for implementing the present invention will be described with reference to the drawings. Figure 1 It is a front view showing the appearance of a gas chromatography system (GC system) equipped with a sulfur chemiluminescence detector (SCD) according to the present embodiment. Figure 2 It is a diagram showing a schematic structure of an SCD according to this embodiment. Figure 3 and Figure 4 is a schematic diagram showing the internal structure of the GC system, Figure 3 is the main view, Figure 4 It is a top view. Figure 5 It is a cross-sectional view showing the structure near the heating furnace of the SCD.

[0038] In addition, Figure 1 , Figure 3 , Figure 4 as well as Figure 5 , the SCD 200 is shown to be arranged at a left adjacent position of the gas chromatograph (GC) 100. However, as described later, the SCD 200 of the present embodiment can also be arranged at a right adjacent position of the GC 100.

[0039] The GC 100 includes a sample introduction unit 110, a column oven 120 that accommodates and heats a column 140, and a control board storage unit 130 that stores a control board (not shown) etc. The front surface of the column oven 120 is an openable and closable door 121, and an operation panel 131 is provided on the front surface of the control board storage unit 130.

[0040] In the GC 100, a sample is introduced into a carrier gas flow at a sample introduction section 110, and the carrier gas containing the sample is introduced into an inlet end of a column 140 housed in a column oven 120. The sample is separated into components in the process of passing through the column 140, and gases containing the separated sample components (hereinafter referred to as "sample gas") are sequentially eluted from an outlet end of the column 140.

[0041] like Figure 2 As shown, the SCD 200 includes a heating furnace 210, a reaction chamber 231, an optical filter 232, a light emission detection unit 233, an ozone generator 234, an ozone scrubber 235, a vacuum pump 236, a flow controller 237, a control / processing unit 238, and a housing 240 for housing these components (see Figure 1 ). In addition, the SCD 200 includes an interface 250 , which is disposed at a boundary between the SCD 200 and the GC 100 and is used to connect the GC 100 and the SCD 200 .

[0042] like Figure 3 and Figure 4 As shown, in the SCD 200, the heating furnace 210 is housed in the upper front side of the housing 240 of the SCD 200, and the reaction chamber 231 and other structural elements (in Figure 3 and Figure 4 The SCD 200 is provided with a removable top plate 241 (see FIG. 24A ). Figure 1 ).

[0043] The heating furnace 210 includes an external combustion tube 211 (equivalent to the "gas flow path" in the present invention), an internal combustion tube 212, an oxidant supply tube 213, an inert gas introduction tube 214, a heater 215 (equivalent to the "first heating unit" in the present invention), and a housing 216 that accommodates these components. The external combustion tube 211 is coaxially arranged inside the oxidant supply tube 213, and one end (left end) of the inert gas introduction tube 214 is inserted into the right end of the external combustion tube 211. In addition, one end (right end) of the internal combustion tube 212 is inserted into the left end of the external combustion tube 211. In addition, the external combustion tube 211, the internal combustion tube 212, the oxidant supply tube 213, and the inert gas introduction tube 214 are all made of ceramics such as alumina.

[0044] A connector 217 is installed at the right end of the oxidant supply pipe 213 and the external combustion pipe 211, and the inert gas introduction pipe 214 is inserted through the connector 217. In addition, the right end openings of the oxidant supply pipe 213 and the external combustion pipe 211 are closed by the connector 217, but a groove is cut in the left end surface of the connector 217, so that gas can flow between the oxidant supply pipe 213 and the external combustion pipe 211 through the groove. The right end of the inert gas introduction pipe 214 protrudes from the outer shell 216 of the heating furnace 210 and is connected to the left end of the pipe 251 (equivalent to the "column passage" of the present invention) provided inside the interface 250, and the interface 250 is arranged at the boundary between the GC 100 and the SCD 200. In addition to the pipe 251, the interface 250 also includes a heater 252 (corresponding to the "second heating unit" of the present invention) for heating the pipe 251 and a housing 253 for accommodating the pipe 251 and the heater 252. The interface 250 is penetrated by an opening 242a (corresponding to the "first opening" of the present invention) provided in the right side wall 242 of the housing 240 of the SCD 200 and an opening 122a provided in the left side wall 122 of the housing of the GC 100. The right end of the pipe 251 protrudes from the housing 253 of the interface 250, and a first joint 221 is attached to the right end. The first joint 221 is connected to an inert gas flow path 264 for supplying an inert gas (here, nitrogen) to the inert gas introduction pipe 214. In addition, a hole (not shown) is provided in the first joint 221 for the column 140 of the GC 100 to pass through. The end of the column 140 on the outlet side passes through the hole through the first joint 221 and is inserted into the interior of the heating furnace 210 via the piping 251 in the interface 250, specifically, into the interior of the inert gas inlet pipe 214 and to a position slightly to the right of the left end of the inert gas inlet pipe 214.

[0045] The left ends of the oxidant supply pipe 213, the external combustion pipe 211, and the internal combustion pipe 212 protrude from the outer shell 216 of the heating furnace 210, and further protrude to the outside from the opening 243a (corresponding to the "second opening" of the present invention) provided in the left side wall 243 of the housing 240 of the SCD 200. Outside the housing 240, a second joint 222 is installed at the left end of the oxidant supply pipe 213, and the second joint 222 is connected to the oxidant flow path 265 for supplying the oxidant (here, oxygen) to the oxidant supply pipe 213. The external combustion pipe 211 passes through the second joint 222, and a third joint 223 is installed at the left end of the external combustion pipe 211. The third joint 223 is connected to the reducing agent flow path 266 for supplying the reducing agent (here, hydrogen) to the external combustion pipe 211. The internal combustion tube 212 passes through the third joint 223 , and the left end of the internal combustion tube 212 is connected to the delivery tube 270 reaching the reaction chamber 231 .

[0046] The delivery tube 270 is composed of a flexible tube, and the delivery tube 270 is folded back outside the housing 240 of the SCD 200 to be delivered from another opening 243b (see FIG. Figure 4 ) enters the interior of the housing 240 again and connects with the reaction chamber 231 in the housing 240. Figure 5 Although not shown in the figure, an openable and closable cover 271 is provided on the outer surface of the left side wall 243 of the SCD 200 at a position covering the openings 243a and 243b.

[0047] The inert gas flow path 264, the oxidant flow path 265, and the reducing agent flow path 266 are all connected to the flow controller 237, and the flow controller 237 is used to control the flow rates of the gases supplied from the inert gas supply source 261, the oxidant supply source 262, and the reducing agent supply source 263 to the inert gas flow path 264, the oxidant flow path 265, and the reducing agent flow path 266, respectively. In addition, the inert gas supply source 261, the oxidant supply source 262, and the reducing agent supply source 263 can be configured by, for example, gas cylinders filled with nitrogen, oxygen, and hydrogen, respectively.

[0048] Nitrogen supplied from the inert gas supply source 261 to the inert gas flow path 264 via the flow controller 237 flows into the right end of the inert gas introduction pipe 214 via the first joint 221 and the pipe 251 , and travels leftward inside the inert gas introduction pipe 214 .

[0049] The oxygen supplied to the oxidant flow path 265 from the oxidant supply source 262 via the flow controller 237 flows into the left end of the oxidant supply pipe 213 via the second joint 222, and moves toward the right in the space between the inner wall of the oxidant supply pipe 213 and the outer wall of the external combustion pipe 211. The oxygen reaching the right end of the oxidant supply pipe 213 flows into the inside of the external combustion pipe 211 from the groove (described above) formed on the left end surface of the connector 217, and moves toward the left in the external combustion pipe 211.

[0050] The hydrogen supplied to the reducing agent flow path 266 from the reducing agent supply source 263 via the flow controller 237 flows into the left end of the external combustion tube 211 via the third joint 223, and moves toward the right in the space between the inner wall of the external combustion tube 211 and the outer wall of the internal combustion tube 212. The hydrogen reaching the vicinity of the right end of the internal combustion tube 212 is introduced into the internal combustion tube 212 from there, and moves toward the left inside the internal combustion tube 212.

[0051] The sample gas introduced into the heating furnace 210 from the outlet end of the column 140 of the GC 100 is mixed with oxygen at the right end of the external combustion tube 211 , and the sample gas is oxidatively decomposed at high temperature while traveling leftward in the external combustion tube 211 .

[0052] At this time, if the sample component is a sulfur compound, sulfur dioxide is generated. The gas containing the sample component after oxidation and decomposition is introduced into the internal combustion tube 212 together with hydrogen introduced from the vicinity of the left end of the external combustion tube 211. If the sample component after oxidation and decomposition contains sulfur dioxide, the sulfur dioxide reacts with hydrogen here and is reduced to sulfur monoxide. The gas passing through the internal combustion tube 212 is introduced into the reaction chamber 231 via the delivery tube 270.

[0053] Furthermore, nitrogen is supplied from the inert gas introduction pipe 214 to the vicinity of the outlet end of the column 140. This nitrogen has the effect of preventing detector contamination due to deterioration of the column 140 and the effect of promoting the redox reaction in the heating furnace 210.

[0054] In order to promote the redox reaction inside the external combustion tube 211 and the internal combustion tube 212, the heater 215 is used to heat the inside of the heating furnace 210 so that the area with the highest temperature inside the heating furnace 210 becomes above 500°C (preferably 700°C to 1200°C).

[0055] The gas sent from the delivery pipe 270 to the reaction chamber 231 is mixed with ozone in the reaction chamber 231. At this time, the chemiluminescence generated by the reaction of sulfur monoxide and ozone is detected by the luminescence detection unit 233 with the aid of the filter 232, wherein the luminescence detection unit 233 is composed of a photomultiplier tube or the like. In addition, the ozone is generated in the ozone generator 234 using oxygen supplied from the oxidant supply source 262 via the oxygen flow path 267, and supplied to the reaction chamber 231. At this time, the flow rate of oxygen supplied to the ozone generator 234 via the oxygen flow path 267 is also controlled by the flow controller 237. An ozone scrubber 235 and a vacuum pump 236 are provided downstream of the reaction chamber 231, and the gas in the reaction chamber 231 sucked out by the vacuum pump 236 is discharged to the outside as exhaust gas after the ozone is removed by the ozone scrubber 235.

[0056] The detection signal from the light emission detection unit 233 is sent to the control / processing unit 238, and the control / processing unit 238 obtains the concentration of the sulfur compound in the sample gas based on the detection signal. The control / processing unit 238 can be specifically implemented by, for example, a microcomputer, which has a CPU, a ROM, a RAM, and an input / output circuit for communicating with external peripheral devices, etc. The control / processing unit 238 processes the detection signal and controls the operation of each unit by, for example, executing arithmetic processing according to a control program or control parameters stored in the ROM with the CPU as the center, and specifically controls the heater 215 of the heating furnace 210, the heater 252 of the interface 250, the light emission detection unit 233, the ozone generator 234, the vacuum pump 236, and the flow controller 237, etc.

[0057] As described above, a detachable top plate 241 is provided on the upper surface of the housing 240 of the SCD 200. By removing the top plate 241, the heating furnace 210 can be taken out of the housing 240 or installed in the housing 240. In the above description, the heating furnace 210 is used in a state where the end of the inlet side of the heating furnace 210 (i.e., the end on the side where the column 140 is inserted) is facing right. However, the housing 240 of the SCD 200 of this embodiment is structured so that the heating furnace 210 can be held in a state where the end of the inlet side of the heating furnace 210 is facing right or in a state where the end of the inlet side of the heating furnace 210 is facing left. Therefore, in addition to being able to be used as in the embodiment, the SCD 200 of this embodiment can also be used as in the embodiment. Figure 1 and Figure 3 to Figure 5 In addition to being arranged adjacent to the left side of the GC 100 as shown in FIG. Figure 6 to Figure 8 As shown, it is arranged and used at a position adjacent to the right side of GC100 (hereinafter referred to as "right placement").

[0058] When the SCD 200 of the present embodiment is placed right, the end of the column 140 on the outlet side needs to be introduced into the SCD 200 via the control substrate housing 130 provided at the right adjacent position of the column oven 120 of the GC 100. Therefore, in this case, it is necessary to use an interface 280 (hereinafter referred to as "right-placement interface") which is longer than the interface 250 instead of the interface 250 used in the left-placement (hereinafter referred to as "left-placement interface"). That is, in the SCD 200 of the present embodiment, two models of interfaces 250 and 280 for left-placement and right-placement are prepared in advance, and the model of the interface corresponding to the user's desired usage (i.e., right-placement or left-placement) is selectively used. In addition, the right-placement interface 280 is provided with a pipe 281, a heater 282, and a housing 283 in the same manner as the left-placement interface 250, and its outer diameter is equal to that of the left-placement interface 250, and its length is longer than the width (the dimension in the left-right direction) of the control substrate housing 130 of the GC 100.

[0059] When the SCD 200 is positioned right, Figure 8 As shown, the partition wall 132 between the column oven 120 and the control substrate housing 130 of the GC 100 and the right side wall 133 of the control substrate housing 130 are respectively formed with openings 132a and 133a, and the right-placement interface 280 is passed through these openings 132a and 133a. In addition, the right-placement interface 280 is passed through the opening 243a of the left side wall 243 of the housing 240 of the SCD 200, and the ends of the oxidant supply pipe 213, the external combustion pipe 211, and the internal combustion pipe 212 protruding from the outer shell 216 of the heating furnace 210 are passed through the opening 242a of the right side wall 242 of the SCD 200. On the outside of the right side wall 242 of the SCD 200, the second joint 222 and the third joint 223 are respectively installed at the ends of the oxidant supply pipe 213 and the external combustion pipe 211, and the end of the internal combustion pipe 212 is connected to the transfer pipe 270 that reaches the reaction chamber 231. In addition, a cover 271 covering the above components is provided on the outside of the right side wall 242 of the SCD 200. Figure 4 Although the reference numerals are omitted, another opening 242b is formed behind the opening 242a of the right side wall 242 of the SCD 200 (see Figure 7 ), when the SCD 200 is placed rightward, the transfer tube 270 is passed through the other opening 242b.

[0060] In the image Figure 1 and Figure 3 to Figure 5 When the SCD 200 is placed on the left, the SCD 200 can be used together with a device (such as a pre-processing device) arranged at a right adjacent position of the GC 100. Figure 6 to Figure 8When the SCD 200 is placed rightward in this way, the SCD 200 can be used together with a device (e.g., MS) disposed adjacent to the left side of the GC 100. When the SCD 200 is used together with another GC detector (e.g., MS), the outlet end of the column 140 of the GC 100 is branched into two using a branch pipe or the like, one of which is connected to the SCD 200 and the other is connected to the other GC detector.

[0061] In the above, specific examples are cited to illustrate the method for implementing the present invention, but the present invention is not limited to the above-mentioned embodiment, and appropriate changes are allowed within the scope of the purpose of the present invention. For example, in the above-mentioned embodiment, both the opening 242a provided on the right side wall 242 of the shell 240 of the SCD 200 and the opening 243a provided on the left side wall 243 are made to allow the oxidant supply pipe 213, the external combustion pipe 211 and the internal combustion pipe 212 (hereinafter collectively referred to as "oxidant supply pipe, etc.") or the interfaces 250, 280 to pass through, but instead, the left and right side walls may be composed of freely loadable and detachable side plates. Fig. 9 and Fig.10 The structure in this case is shown in FIG. As the side plate, a first side plate 244 having an opening 244a through which the interfaces 250 and 280 can pass and a second side plate 245 having an opening 245a through which the oxidant supply pipe and the like can pass (and an opening 245b through which the transfer pipe 270 can pass) can be prepared, and the above components can be replaced as appropriate. In this case, when the SCD 200 is placed on the left, as shown in FIG. Fig. 9 As shown in FIG. 2 , the first side plate 244 is mounted on the right side of the housing 240 of the SCD 200, and the second side plate 245 is mounted on the left side of the housing 240 of the SCD 200. Conversely, when the SCD 200 is placed rightward, as shown in FIG. Fig.10 As shown in FIG. 2 , the first side plate 244 is mounted on the left side of the housing 240 of the SCD 200 , and the second side plate 245 is mounted on the right side of the housing 240 of the SCD 200 .

[0062] In addition, in the above embodiment, oxygen is used as an oxidant, but air can be used instead of oxygen. In addition, in the above embodiment, nitrogen is used as an inert gas, but other inert gases (such as helium) can be used as inert gases. In addition, the supply of inert gas is not an action required for the operation of the SCD, so the SCD of the present invention can also be set to a structure without the inert gas supply source 261, the inert gas flow path 264, the inert gas introduction pipe 214, etc.

[0063] Description of Reference Numerals

[0064] 100, GC; 110, sample introduction unit; 120, column oven; 130, control substrate storage unit; 140, column; 200, SCD; 210, heating furnace; 211, external combustion tube; 212, internal combustion tube; 213, oxidant supply tube; 214, inert gas introduction tube; 215, heater; 216, housing; 231, reaction chamber; 232, filter; 233, luminescence detection unit; 234, ozone generator device; 235, ozone scrubber; 236, vacuum pump; 237, flow controller; 238, control / processing unit; 240, shell; 242, right side wall; 242a, opening; 243, left side wall; 243a, opening; 250, 280, interface; 270, right interface; 251, 281, piping; 252, 282, heater; 253, 283, shell; 244, first side plate; 245, second side plate.

Claims

1. A sulfur chemiluminescence detector, characterized in that: The sulfur chemiluminescence detector has: A heating furnace including a gas flow path extending in the left-right direction and having an inlet-side end portion of the gas flow path inserted into an outlet-side end portion of a column of a gas chromatograph, and a first heating unit for heating the gas flow path; a reaction chamber that reacts the gas passing through the gas flow path of the heating furnace with ozone; a light detector that detects light emitted from the reaction chamber; a housing having at least a first side wall and a second side wall opposite to each other in the left-right direction and accommodating the heating furnace, the reaction chamber, and the photodetector; and An interface having a column passage through which the column passes and a second heating unit for heating the column passage, The housing is capable of maintaining the heating furnace in one of the following two states: a state in which the end of the inlet side of the gas flow path faces the side where the first side wall is located, and a state in which the end of the inlet side faces the side where the second side wall is located. Furthermore, the housing can mount the interface on either the first side wall or the second side wall. The housing has: a first opening disposed on the first side wall; and a second opening disposed on the second side wall. The interface can pass through any one of the first opening and the second opening.

2. The sulfur chemiluminescence detector according to claim 1, characterized in that The first opening is provided coaxially with the gas flow path of the heating furnace, and the second opening is provided coaxially with the gas flow path.

3. The sulfur chemiluminescence detector according to claim 1, characterized in that The interfaces having different lengths are selected depending on whether the interface is mounted on the first side wall or the second side wall.

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