Calibration jig

Abstract

The utility model provides a calibration jig, a rotating mechanism, comprising a rotation driving member, a rotating disc in transmission connection with the rotation driving member, and a standard tilt angle sensor installed on the rotating disc, the rotating disc is provided with an electrical slip ring electrically connected with the standard tilt angle sensor, and the standard tilt angle sensor is used for detecting the rotation angle of the rotating disc; the tool clamp comprises an abutting assembly and a limiting assembly detachably installed on the rotating disc, the limiting assembly is provided with at least two limiting grooves, the abutting assembly can abut against or be away from the circuit board, and the electrical sliding ring is used for being electrically connected with the abutted circuit board; and the electrical slip ring and the rotary driving part are electrically connected with the controller, and the controller is used for receiving detection angle values of the standard tilt angle sensor and the circuit board. According to the utility model, the calibration of different tilt angle sensors can be realized by comparing the detection angle values of the circuit board and the standard tilt angle sensor and replacing different limiting assemblies in a matched manner, the structure is simple, and the calibration efficiency is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of sensor measurement, and in particular relates to a calibration fixture. Background Art

[0002] The tilt sensor, also known as inclinometer, inclinometer, level, inclinometer, is a detection tool commonly used to measure the horizontal or vertical angle changes of the system. It can accurately and real-time monitor and record the changes in the tilt angle, providing important data support for various industrial applications and scientific research fields. It has become an indispensable and important measurement tool in the fields of bridge erection, railway laying, civil engineering, oil drilling, aviation and navigation, industrial automation, intelligent platform, mechanical processing, etc.

[0003] As a measuring tool, sensor products are most concerned about measurement accuracy, so sensor products require strict calibration tools; generally, all inclinometer systems do not have a method for rapid on-site calibration, which means that when users use inclinometers, if they want to ensure high-precision measurement of the inclinometer, they need the manufacturer to complete angle calibration before leaving the factory to ensure the reliability of angle measurement. However, existing inclinometer calibration equipment is usually more complex, larger in size, and has low calibration efficiency, resulting in high inclinometer calibration costs. Utility Model Content

[0004] The main purpose of the utility model is to provide a calibration fixture, aiming to solve the technical problems of the complicated structure and low calibration efficiency of the calibration device of the tilt sensor in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a calibration fixture, which comprises: a rotating mechanism, comprising a rotating drive member, a turntable drivingly connected to the rotating drive member, and a standard inclination sensor installed on the turntable, the turntable is provided with an electrical slip ring electrically connected to the standard inclination sensor, and the standard inclination sensor is used to detect the rotation angle of the turntable; a fixture, comprising a pressing component and a limiting component detachably installed on the turntable, the limiting component is provided with at least two limiting grooves, the limiting groove is used to limit the circuit board of the inclination sensor to be calibrated, the pressing component can abut against or stay away from the circuit board, and the electrical slip ring is used to be electrically connected to the abutted circuit board; a controller, the electrical slip ring and the rotating drive member are both electrically connected to the controller, and the controller is used to receive the detection angle values ​​of the standard inclination sensor and the circuit board.

[0006] In an embodiment of the utility model, the limiting assembly includes: a bottom frame, which is connected to the turntable through legs, the turntable is provided with a wire passing hole, a wire passing gap is provided between the bottom frame and the turntable, and a card slot is provided on the bottom frame; a bottom plate, which is detachably connected to the card slot, and the limiting slot is provided on the bottom plate.

[0007] In an embodiment of the utility model, the pressing assembly includes: a cover frame, which is hinged to the bottom frame and can rotate relative to the bottom frame between a marked position and an avoidance position, and the cover frame located at the avoidance position is used to avoid the bottom plate; a pressure plate, which is telescopically mounted on the cover frame, and the pressure plate is provided with a pin for abutting against the circuit board.

[0008] In an embodiment of the utility model, the cover frame is provided with a hollow groove for the pressure plate to pass through, and the pressing assembly further comprises a connecting transverse plate installed on the cover frame, and the pressure plate is connected to the connecting transverse plate via a telescopic assembly.

[0009] In an embodiment of the utility model, the telescopic assembly includes a telescopic top rod and a pressure rod handle installed on the connecting cross plate, the pressure rod handle and the pressure plate are respectively connected to the two ends of the telescopic top rod, and the pressure rod handle is used to drive the pressure plate to move through the telescopic top rod.

[0010] In an embodiment of the utility model, one side of the cover frame is hinged to the bottom frame via a rotary hinge, and the other side of the cover frame is hinged to the bottom frame via a limiting connecting rod.

[0011] In an embodiment of the utility model, a locking groove is provided on the bottom frame, and a locking hook for locking the locking groove is provided on the cover frame; and / or a cover plate handle is provided on the cover frame.

[0012] In an embodiment of the utility model, the calibration fixture further includes an electric control box, the rotary drive component and the controller are electrically connected to the electric control box, and the turntable is installed in the electric control box.

[0013] In an embodiment of the utility model, the calibration fixture also includes a base, the controller is installed in the base, the rotating mechanism and the tooling fixture are installed on the upper supporting surface of the base, and a plurality of handles are provided on the upper supporting surface of the base.

[0014] In an embodiment of the utility model, the calibration fixture includes an alarm electrically connected to the controller.

[0015] Through the above technical solution, the calibration fixture provided by the embodiment of the utility model has the following beneficial effects:

[0016] When the calibration jig is used to calibrate the inclination sensor, the circuit board of the inclination sensor to be calibrated can be limited by the limit assembly. At least two limit grooves are provided on one limit assembly, which can limit at least two circuit boards, thereby improving the calibration efficiency of the inclination sensor. Moreover, the calibration jig is aimed at circuit boards in the early stage of production, and can screen out defective products in the early stage of production, avoid rework of finished products, reduce error correction time, and improve product quality and production efficiency. Moreover, the circuit board is used as the calibration target, and the volume is small. No other components need to be replaced. Only by replacing the limit assembly, different types of inclination sensors can be calibrated, thereby reducing the implementation cost of the calibration jig. The pressing assembly is adjusted to make the pressing assembly move relative to the limit assembly, so that the electrical slip ring and the abutted circuit board are electrically connected. After the calibration jig is energized, the rotating drive member drives the turntable to rotate, the standard inclination sensor and the circuit board can detect the rotation angle of the turntable, the controller can receive the detection angle values ​​of the standard inclination sensor and the circuit board, and the circuit board can be calibrated by comparing the two detection angle values. The calibration fixture structure in the utility model cooperates with a rotating mechanism, a fixture and a controller, and can realize the calibration of different inclination sensors by comparing the detection angle values ​​of the circuit board and the standard inclination sensor, and replacing different limit components. The structure is simple and the calibration efficiency is high. When the limit component needs to be replaced, the pressing component can be adjusted to keep the pressing component away from the limit component, and avoid the limit component, thereby facilitating the replacement of the limit component.

[0017] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the accompanying drawings:

[0019] Figure 1 It is a structural schematic diagram of a calibration fixture according to an embodiment of the utility model;

[0020] Figure 2 It is a schematic diagram of the rotating mechanism and fixture structure of the calibration fixture according to one embodiment of the utility model;

[0021] Figure 3 It is a partial structural schematic diagram of a calibration fixture according to an embodiment of the utility model.

[0022] Description of Reference Numerals

[0023] DETAILED DESCRIPTION

[0024] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0025] The calibration fixture according to the present utility model is described below with reference to the accompanying drawings.

[0026] like Figures 1 to 3 As shown, the calibration fixture 100 includes a rotating mechanism, a fixture and a controller. The rotating mechanism includes a rotating drive member 1, a turntable 2 transmission-connected to the rotating drive member 1 and a standard inclination sensor installed on the turntable 2. The turntable 2 is provided with an electrical slip ring electrically connected to the standard inclination sensor, and the standard inclination sensor is used to detect the rotation angle of the turntable 2; the fixture includes a pressing component 4 and a limiting component 5 detachably installed on the turntable 2, the limiting component 5 is provided with at least two limiting grooves, the limiting grooves are used to limit the circuit board 200 of the inclination sensor to be calibrated, the pressing component 4 can abut against or stay away from the circuit board 200, and the electrical slip ring is used to be electrically connected to the abutted circuit board 200; the electrical slip ring and the rotating drive member 1 are both electrically connected to the controller, and the controller is used to receive the detection angle values ​​of the standard inclination sensor and the circuit board 200. It can be understood that the rotary drive member 1 in this embodiment can be a stepping motor, and the calibration fixture 100 also includes a rotating table 3, and the rotary drive member 1 and the turntable 2 are both installed on the rotating table 3, and the turntable 2 is vertically arranged.

[0027] When the calibration fixture 100 in this embodiment is used to calibrate the inclination sensor, the circuit board 200 of the inclination sensor to be calibrated can be limited by the limit assembly 5. At least two limit grooves are provided on one limit assembly 5, which can limit at least two circuit boards 200, thereby improving the calibration efficiency of the inclination sensor. The calibration fixture 100 is aimed at the circuit boards 200 in the early stage of production, and can screen out defective products in the early stage of production, avoid rework of finished products, reduce error correction time, improve product quality and production efficiency, and take the circuit board 200 as the calibration target, which is small in size and does not need to replace other components. Only by replacing the limit assembly 5, different types of inclination sensors can be calibrated, which reduces the implementation cost of the calibration fixture 100. The pressing assembly 4 is adjusted to make the pressing assembly 4 move relative to the limit assembly 5, so that the electrical slip ring and the abutted circuit board 200 are electrically connected. After the calibration fixture 100 is powered on, the rotating drive member 1 drives the turntable 2 to rotate, the standard inclination sensor and the circuit board 200 can detect the rotation angle of the turntable 2, and the controller can receive the detection angle values ​​of the standard inclination sensor and the circuit board 200. By comparing the two detection angle values, the circuit board 200 can be calibrated. The structure of the calibration fixture 100 in this embodiment is coordinated by the rotating mechanism, the fixture and the controller. By comparing the detection angle values ​​of the circuit board 200 and the standard inclination sensor, and by replacing different limit assemblies 5, the calibration of different inclination sensors can be achieved. The structure is simple and the calibration efficiency is high. When the position-limiting component 5 needs to be replaced, the pressing component 4 can be adjusted to keep the pressing component 4 away from the position-limiting component 5 and avoid the position-limiting component 5, thereby facilitating the replacement of the position-limiting component 5.

[0028] In one embodiment, the limit assembly 5 includes a bottom frame 51 and a bottom plate 54. The bottom frame 51 is connected to the turntable 2 through the legs 52. The turntable 2 is provided with a wire hole 21. A wire gap 53 is provided between the bottom frame 51 and the turntable 2. A card slot is provided on the bottom frame 51. The bottom plate 54 and the card slot are detachably connected, and the limit slot is provided on the bottom plate 54. In this embodiment, there can be four electrical slip rings, two of which are power supply slip rings, and the other two are communication slip rings. The standard inclination sensor and the circuit board 200 can be powered through the power supply slip rings, and the standard inclination sensor and the circuit board 200 can send signals to the controller through the communication slip rings. The connection between the electrical slip ring and the circuit board 200 can enter the turntable 2 through the wire gap 53 and the wire slot. The bottom plate 54 in this embodiment matches the shape of the card slot, and the turntable 2 is a hollow disc, which is detachably connected to the bottom plate 54 and the bottom frame 51. By replacing different types of bottom plates 54, different types of circuit boards 200 can be calibrated. The structure is simple and the cost is low. In this embodiment, the bottom plate 54 is a flat plate.

[0029] like Figure 2 and Figure 3As shown, the pressing assembly 4 includes a cover frame 41 and a pressing plate 42. The cover frame 41 is hinged to the bottom frame 51 and can rotate between a calibrated position and an avoidance position relative to the bottom frame 51. The cover frame 41 at the avoidance position is used to avoid the bottom plate 54. The pressing plate 42 is telescopically mounted on the cover frame 41, and a pin for contacting the circuit board 200 is provided on the pressing plate 42. The pressing plate 42 in this embodiment can be a transparent acrylic plate. When the bottom plate 54 needs to be replaced, the cover frame 41 can be rotated to the avoidance position to facilitate the removal of the bottom plate 54. After the corresponding bottom plate 54 is installed, the cover frame 41 can be rotated to the calibrated position. The cover frame 41 at the calibrated position is close to the bottom plate 54, which can facilitate the pressing plate 42 to telescopically contact the circuit board 200 at the upper limit of the bottom plate 54.

[0030] Specifically, the cover frame 41 is provided with a hollow groove for the pressure plate 42 to pass through, and the pressing assembly 4 further includes a connecting transverse plate 43 installed on the cover frame 41, and the pressure plate 42 is connected to the connecting transverse plate 43 through a telescopic assembly. The connecting transverse plate 43 in this embodiment extends in the left-right direction, and the pressure plate 42 and the bottom plate 54 are sequentially arranged in the front-back direction. The cover frame 41 is a hollow rectangular frame, and the pressure plate 42 is located in the hollow groove when it does not abut against the circuit board 200. The telescopic assembly can be telescopic relative to the connecting transverse plate 43, so that the pressure plate 42 can telescopically move relative to the connecting transverse plate 43. The pressure plate 42 in this embodiment is connected through the connecting transverse plate 43, and the connection structure is simple. When the pressure plate 42 or the cover frame 41 needs to be replaced and repaired, it can be replaced and repaired separately, and the maintenance cost is low.

[0031] like Figure 3 As shown, the telescopic assembly includes a telescopic top rod and a pressure rod handle 44 installed on the connecting cross plate 43. The pressure rod handle 44 and the pressure plate 42 are respectively connected to the two ends of the telescopic top rod. The pressure rod handle 44 is used to drive the pressure plate 42 to move through the telescopic top rod. The pressure rod handle 44 in this embodiment is located at the front side of the connecting cross plate 43. The operator can drive the telescopic top rod to telescope by rotating the pressure rod handle 44. The pressure rod handle 44 can reciprocate between the unfolded position and the folded position. Figure 2 The pressure bar handle 44 shown is in the folded position, and the telescopic top rod is retracted. The pressure bar handle 44 in this embodiment is provided with anti-skid lines, which can facilitate the operation of the operator.

[0032] It should be noted that one side of the cover frame 41 is hinged to the bottom frame 51 through a rotating hinge 6, and the other side of the cover frame 41 is hinged to the bottom frame 51 through a limit link 7. In this embodiment, two rotating hinges 6 are arranged on the top of the cover frame 41, and the cover frame 41 and the bottom frame 51 can be hinged through the rotating hinges 6. Limit links 7 are arranged on the left and right sides of the cover frame 41, and the two ends of the limit links 7 are respectively hinged to the bottom frame 51 and the cover frame 41. When the cover frame 41 rotates relative to the bottom frame 51, the limit link 7 is a telescopic rod, and the telescopic stroke of the limit link 7 can limit the rotation angle of the cover frame 41, so as to avoid the cover frame 41 from being separated from the bottom frame 51, thereby improving the stability of the calibration fixture 100.

[0033] In the embodiment of the utility model, a locking groove 511 is provided on the bottom frame 51, and a locking hook 411 for locking with the locking groove 511 is provided on the cover frame 41; and a cover plate handle 412 is provided on the cover frame 41. The bottom frame 51 and the cover frame 41 in this embodiment can be locked with each other through the locking groove 511 and the locking hook 411, and the cover plate handle 412 is connected to the locking hook 411, and the locking hook 411 can be locked by pushing the cover plate handle 412 backward. The cover plate handle 412 in this embodiment is tilted forward and protrudes forward relative to the cover frame 41, which can facilitate the operation of the operator.

[0034] The fixture in this embodiment further includes a compression spring 10, and the number of the compression spring 10 can be multiple. Figure 1 There are four middle compression springs 10, and a compression rod is provided on the pressure plate 42. The compression spring 10 is sleeved outside the pressure rod. When the pressure plate 42 is pushed backward, the bottom frame 51 and the cover frame 41 are locked by the locking hook 411, and the compression spring 10 is compressed, which can provide elastic compression force to the pressure plate 42, so that the pressure plate 42 and the circuit board 200 can fit more closely.

[0035] In one embodiment, the calibration fixture 100 further includes an electric control box 8, the rotary drive member 1 and the controller are electrically connected to the electric control box 8, and the turntable 2 is installed on the electric control box 8. The rotating table 3 can be fixed to the electric control box 8 by screws and studs; the controller controls the electric control box 8 to execute commands through the internal wiring harness; the electric control box 8 controls the rotation of the stepper motor, and at the same time integrates an electrical slip ring in the rotating table 3 to power and communicate with the standard inclination sensor and the inclination sensor to be calibrated, and the stepper motor drives the rotating table 3 to rotate through the rotating shaft and gear transmission; the fixture and the standard inclination sensor can be installed on the rotating table 3 through studs. The limit buckle of the limit circuit board 200 can be set on the bottom plate 54.

[0036] like Figure 1As shown, the calibration fixture 100 also includes a base 9, a controller is installed in the base 9, a rotating mechanism and a fixture are installed on the upper support surface of the base 9, and a plurality of handles 91 are provided on the upper support surface of the base 9. The base 9 in this embodiment is located at the bottom of the fixture, and the number of handles 91 on the base 9 can be set according to actual use requirements. The controller can be embedded in the base 9 to protect the controller, and the controller can be a PLC controller. The upper support surface is a plane, which can facilitate the installation of the electric control box 8. The electric control box 8 is a rectangular box, and a front mounting plane is provided on the front side of the electric control box 8, and the rotating table 3 is installed on the front mounting plane.

[0037] It should be noted that the calibration fixture 100 includes an alarm electrically connected to the controller. A power switch is also provided on the base 9. After the circuit board 200 of the calibrated inclination sensor is installed, the power switch is turned on, the controller is powered on, and power is supplied to the rotating drive member 1, the standard inclination sensor, and the circuit board 200 at the same time; the calibration is started through the controller, the controller first reads the angle of the standard inclination sensor, and the control device is reset to zero; then the controller checks whether the communication connection with the circuit board 200 is normal; if the communication is abnormal, the alarm sounds an alarm to remind the operator to check whether the installation is correct. If the communication is normal, the controller controls the rotating drive member 1 to rotate the set angle α, reads the detection angle value β of the standard inclination sensor, compares the two angles to see if they are within the preset accuracy range, and verifies whether the current angle is correct; if the angle is correct, the current angle is written to the circuit board 200; if the angle is abnormal, the rotating drive member 1 is controlled to adjust the angle to form a closed-loop feedback; repeat the above steps until all angles are calibrated. Angle verification: The controller controls the rotating drive member 1 to rotate a random angle, reads the detection angle value of the standard inclination sensor and the detection angle value of the circuit board 200, and verifies the error between the two sets of angle values. If the error exceeds the set value, the calibration is considered to have failed, and the alarm sounds an alarm to remind the operator to recalibrate or check whether the circuit board 200 and the standard inclination sensor are abnormal.

[0038] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0041] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A calibration fixture for calibrating an inclination sensor, characterized in that: The calibration fixture (100) comprises: A rotating mechanism, comprising a rotating drive member (1), a rotating disk (2) drivingly connected to the rotating drive member (1), and a standard inclination sensor mounted on the rotating disk (2), wherein the rotating disk (2) is provided with an electrical slip ring electrically connected to the standard inclination sensor, and the standard inclination sensor is used to detect the rotation angle of the rotating disk (2); A fixture, comprising a pressing component (4) and a limiting component (5) detachably mounted on the rotating disk (2), the limiting component (5) being provided with at least two limiting grooves, the limiting grooves being used to limit the circuit board (200) of the inclination sensor to be calibrated, the pressing component (4) being able to abut against or move away from the circuit board (200), and the electrical slip ring being used to be electrically connected to the abutted circuit board (200); A controller, the electrical slip ring and the rotary drive member (1) are electrically connected to the controller, and the controller is used to receive the detection angle values ​​of the standard inclination sensor and the circuit board (200).

2. The calibration fixture according to claim 1, characterized in that: The limiting component (5) comprises: A bottom frame (51) is connected to the rotating disk (2) via supporting legs (52); the rotating disk (2) is provided with a wire-passing hole (21); a wire-passing gap (53) is provided between the bottom frame (51) and the rotating disk (2); and a card slot is provided on the bottom frame (51); The bottom plate (54) is detachably connected to the card slot, and the limiting slot is arranged on the bottom plate (54).

3. The calibration fixture according to claim 2, characterized in that: The pressing component (4) comprises: A cover frame (41) is hingedly connected to the bottom frame (51) and can rotate relative to the bottom frame (51) between a marked position and an avoidance position, wherein the cover frame (41) located at the avoidance position is used to avoid the bottom plate (54); A pressing plate (42) is telescopically mounted on the cover frame (41), and a push pin for abutting against the circuit board (200) is provided on the pressing plate (42).

4. The calibration fixture according to claim 3, characterized in that: The cover frame (41) is provided with a hollow groove for the pressure plate (42) to pass through, and the pressing assembly (4) further comprises a connecting transverse plate (43) mounted on the cover frame (41), and the pressure plate (42) is connected to the connecting transverse plate (43) via a telescopic assembly.

5. The calibration fixture according to claim 4, characterized in that: The telescopic assembly comprises a telescopic top rod and a pressure rod handle (44) mounted on the connecting cross plate (43); the pressure rod handle (44) and the pressure plate (42) are respectively connected to two ends of the telescopic top rod; the pressure rod handle (44) is used to drive the pressure plate (42) to move via the telescopic top rod.

6. The calibration fixture according to any one of claims 3 to 5, characterized in that: One side of the cover frame (41) is hinged to the bottom frame (51) via a rotating hinge (6), and the other side of the cover frame (41) is hinged to the bottom frame (51) via a limiting connecting rod (7).

7. The calibration fixture according to any one of claims 3 to 5, characterized in that: The bottom frame (51) is provided with a locking groove (511), and the cover frame (41) is provided with a locking hook (411) for locking the locking groove (511); and / or, The cover frame (41) is provided with a cover plate handshake (412).

8. The calibration fixture according to any one of claims 1 to 5, characterized in that: The calibration fixture (100) further comprises an electric control box (8), the rotary drive member (1) and the controller are both electrically connected to the electric control box (8), and the turntable (2) is mounted on the electric control box (8).

9. The calibration fixture according to any one of claims 1 to 5, characterized in that: The calibration fixture (100) further comprises a base (9), the controller is mounted in the base (9), the rotating mechanism and the fixture are mounted on an upper support surface of the base (9), and a plurality of handles (91) are provided on the upper support surface of the base (9).

10. The calibration fixture according to any one of claims 1 to 5, characterized in that: The calibration fixture (100) comprises an alarm electrically connected to the controller.

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