Verification device for temperature sensor

Abstract

The utility model provides a verification device used for a temperature sensor, the temperature sensor comprises a probe and a mainboard, and the verification device comprises a power supply unit, a switching unit, a mainboard verification unit, an ammeter and a probe verification unit; the power supply unit is connected with the mainboard verification unit and the probe verification unit through the ampere meter and the switching unit; the mainboard verification unit is connected with a to-be-verified mainboard and is used for simulating the probe so as to verify the to-be-verified mainboard; and the probe verification unit is connected with a to-be-verified probe and is used for verifying the to-be-verified probe of the simulation mainboard. According to the utility model, the mainboard verification unit is arranged to simulate the probe, so that the to-be-verified mainboard is verified; the probe verification unit is arranged to simulate the function of the mainboard to verify the probe to be verified, the switching unit is combined to realize the switching between the mainboard verification unit and the probe verification unit, and meanwhile, the ammeter is arranged, so that the verification result can be intuitively observed.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature sensor calibration, in particular to a calibration device for a temperature sensor. Background Art

[0002] A temperature sensor is a sensor that can sense temperature and convert it into a usable output signal. The temperature sensor is the core part of the temperature measuring instrument. The BAS system needs to continuously monitor the water supply temperature, return water temperature, air temperature and other data in the subway ventilation and air-conditioning equipment, so as to automatically adjust the number, power and operation mode of ventilation and air-conditioning equipment to achieve energy saving. However, the temperature sensor has a long service life and a high damage rate due to environmental influences, which leads to large errors in the data collected by the temperature sensor, affecting the operation of the system. At present, there is still a lack of relevant equipment for calibrating the temperature sensor, resulting in certain errors in the temperature data obtained by the system. Utility Model Content

[0003] In view of the above problems, the utility model is proposed to provide a calibration device for a temperature sensor, which is easy to use and can quickly calibrate the temperature sensor.

[0004] The utility model discloses a calibration device for a temperature sensor. The temperature sensor comprises a probe and a mainboard, including: a power supply unit, a switching unit, a mainboard calibration unit, an ammeter and a probe calibration unit;

[0005] The power supply unit is connected to the mainboard calibration unit and the probe calibration unit through the ammeter and the switching unit;

[0006] The mainboard verification unit is connected to the mainboard to be verified, and is used to simulate the probe for verification of the mainboard to be verified;

[0007] The probe calibration unit is connected to the probe to be calibrated and is used to calibrate the probe to be calibrated of the analog mainboard.

[0008] As a further improvement of the present utility model, the mainboard verification unit includes a plurality of mainboard verification branches;

[0009] The power supply unit is connected to each of the mainboard verification branches through the switching unit;

[0010] The mainboard verification branch includes: a first relay and an adjustable resistor;

[0011] The first end of the coil of the first relay is connected to the positive electrode of the power supply unit through the switching unit and the ammeter, the second end of the coil of the first relay is connected to the negative electrode of the power supply unit, the negative electrode of the power supply of the mainboard to be checked is connected to the negative electrode of the power supply unit, and the positive electrode of the power supply of the mainboard to be checked is connected to the first end of the coil of the first relay;

[0012] The first signal end of the mainboard to be checked, the normally open contact of the first relay, the adjustable resistor, and the second signal end of the mainboard to be checked are connected in series to form a loop.

[0013] As a further improvement of the utility model, the probe calibration unit comprises: an abnormal temperature calibration branch and a normal temperature calibration branch;

[0014] The abnormal temperature verification branch includes: a second relay, a temperature controller, a verified mainboard and a thermometer;

[0015] The first end of the coil of the second relay is connected to the positive electrode of the power supply unit through the switching unit and the ammeter, the second end of the coil of the second relay is connected to the negative electrode of the power supply unit, the negative electrode of the power supply of the verified mainboard is connected to the negative electrode of the power supply unit, and the positive electrode of the power supply of the verified mainboard is connected to the first end of the coil of the second relay;

[0016] The first signal terminal of the mainboard that has passed the verification, the normally open contact of the second relay, the probe to be verified, and the second signal terminal of the mainboard that has passed the verification are connected in series to form a loop, wherein the probe to be verified and the thermometer are placed in the temperature controller;

[0017] The normal temperature verification branch includes: a third relay and a main board that has passed the verification;

[0018] The first end of the coil of the third relay is connected to the positive electrode of the power supply unit through the switching unit and the ammeter, the second end of the coil of the third relay is connected to the negative electrode of the power supply unit, the negative electrode of the power supply of the mainboard that has passed the verification is connected to the negative electrode of the power supply unit, and the positive electrode of the power supply of the mainboard that has passed the verification is connected to the first end of the coil of the third relay;

[0019] The first signal end of the mainboard that has passed the verification, the normally open contact of the third relay, the probe to be verified, and the second signal end of the mainboard that has passed the verification are connected in series to form a loop.

[0020] As a further improvement of the utility model, the utility model further includes: an indication unit; the indication unit is respectively connected in series to the mainboard verification unit and the probe verification unit.

[0021] As a further improvement of the present utility model, the indicating unit comprises: a first indicating light, a second indicating light, and a third indicating light;

[0022] The two ends of the first indicator light are respectively connected to the first end of the coil of the first relay and the positive pole of the power supply of the mainboard to be checked;

[0023] Two ends of the second indicator light are respectively connected to the first end of the coil of the second relay and the positive pole of the power supply of the mainboard to be checked;

[0024] The two ends of the third indicator light are respectively connected to the first end of the coil of the third relay and the positive pole of the power supply of the mainboard to be checked.

[0025] As a further improvement of the utility model, the utility model also includes: a calibration device box for accommodating the power supply unit, the switching unit, the mainboard calibration unit and the probe calibration unit.

[0026] As a further improvement of the utility model, the verification device box comprises: a box body and a panel;

[0027] The power supply unit, the switching unit, the mainboard calibration unit and the probe calibration unit are placed in the box;

[0028] The ammeter is arranged on the panel.

[0029] As a further improvement of the utility model, the utility model further comprises: a probe socket arranged on the panel, the probe socket being serially connected in the probe calibration unit and being used for connecting the probe to be calibrated.

[0030] As a further improvement of the utility model, the utility model further comprises: a mainboard socket arranged on the panel, the mainboard socket being serially connected in the mainboard verification unit for connecting the mainboard to be verified.

[0031] As a further improvement of the utility model, the power supply unit comprises: a DC power supply and a power switch, wherein the DC power supply is connected to the switching unit via the power switch;

[0032] The power switch is arranged on the panel.

[0033] The utility model has the following technical effects: by setting the mainboard verification unit to simulate the probe, the verification of the mainboard to be verified is realized; by setting the probe verification unit to simulate the function of the mainboard, the verification of the probe to be verified is realized, and in combination with the switching unit, the switching between the mainboard verification unit and the probe verification unit is realized. At the same time, an ammeter is provided to intuitively observe the verification result. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1It is a circuit diagram of the verification device of the utility model;

[0035] Figure 2 This is a panel layout diagram of the verification device described in the utility model.

[0036] Explanation of the accompanying drawings: 1. Power supply unit; 11. Power switch; 2. Switching unit; 3. Mainboard calibration unit; 4. Probe calibration unit; 41. Temperature controller; 42. Thermometer; 43. Mainboard that has passed the calibration; 5. Panel; 6. Probe socket; 7. Mainboard socket; 8. Ammeter interface; 9. Power interface; 100. Mainboard to be calibrated; 101. Probe to be calibrated. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0038] Reference Figure 1 , shows a calibration device for a temperature sensor provided by the utility model, the temperature sensor includes a probe and a mainboard, including: a power supply unit 1, a switching unit 2, a mainboard calibration unit 3, an ammeter and a probe calibration unit 4; the power supply unit 1 is connected to the mainboard calibration unit 3 and the probe calibration unit 4 through the ammeter A and the switching unit 2; the mainboard calibration unit 3 is connected to the mainboard 100 to be calibrated, and is used to simulate the probe for calibration of the mainboard 100 to be calibrated; the probe calibration unit 4 is connected to the probe 101 to be calibrated, and is used to calibrate the probe 101 to be calibrated of the simulated mainboard.

[0039] Furthermore, the mainboard verification unit 3 includes several mainboard verification branches; the power supply unit 1 is connected to each mainboard verification branch through the switching unit 2; the mainboard verification branch includes: a first relay KA1 and an adjustable resistor X1; the first end of the coil of the first relay KA1 is connected to the positive pole of the power supply unit 1 through the switching unit 2 and the ammeter A, the second end of the coil of the first relay KA1 is connected to the negative pole of the power supply unit 1, the negative pole of the power supply of the mainboard 100 to be verified is connected to the negative pole of the power supply unit 1, and the positive pole of the power supply of the mainboard 100 to be verified is connected to the first end of the coil of the first relay KA1; the first signal end of the mainboard 100 to be verified, the normally open contact of the first relay KA1, the adjustable resistor X1, and the second signal end of the mainboard 100 to be verified are connected in series to form a loop.

[0040] The probe calibration unit 4 includes: an abnormal temperature calibration branch and a normal temperature calibration branch; the abnormal temperature calibration branch includes: a second relay KA2, a temperature controller 41, a calibrated main board 43 and a thermometer 42; the first end of the coil of the second relay KA2 is connected to the positive pole of the power supply unit 1 through the switching unit 2 and the ammeter A, the second end of the coil of the second relay KA2 is connected to the negative pole of the power supply unit 1, the negative pole of the power supply of the calibrated main board 43 is connected to the negative pole of the power supply unit 1, and the positive pole of the power supply of the calibrated main board 43 is connected to the first end of the coil of the second relay KA2; the first signal end of the calibrated main board 43, the normally open contact of the second relay KA2, the probe 101 to be calibrated, and the second signal end of the calibrated main board 43 are connected in series. The circuits are connected to form a loop, wherein the probe 101 to be checked and the thermometer 42 are placed in the temperature controller 41; the normal temperature check branch includes: a third relay KA3 and a main board 43 that has passed the check; the first end of the coil of the third relay KA3 is connected to the positive pole of the power supply unit 1 through the switching unit 2 and the ammeter A, the second end of the coil of the third relay KA3 is connected to the negative pole of the power supply unit 1, the negative pole of the power supply of the main board 43 that has passed the check is connected to the negative pole of the power supply unit 1, and the positive pole of the power supply of the main board 43 that has passed the check is connected to the first end of the coil of the third relay KA3; the first signal end of the main board 43 that has passed the check, the normally open contact of the third relay, the probe 101 to be checked, and the second signal end of the main board 43 that has passed the check are connected in series to form a loop.

[0041] The temperature controller 41 is used to create a temperature environment during the calibration process, and the thermometer 42 allows the user to observe the real-time temperature of the environment.

[0042] When the switching unit 2 switches to the corresponding branch, the power supply unit 1 is connected to the two ends of the relay coil, the normally open contacts of the relay are closed, and the corresponding branch is started; or, when the switching unit 2 is switched to the full-through branch state, the power supply unit 1 provides power to all mainboard verification branches, abnormal temperature verification branches, and normal temperature verification branches, and all branches start the verification work at the same time. By adopting this verification mode, multiple probes to be verified and mainboards to be verified can be verified at the same time to improve the efficiency of the verification.

[0043] In order to be able to more intuitively see the working status of the device, the utility model further comprises: an indicating unit; the indicating unit is serially connected to the mainboard verification unit 3 and the probe verification unit 4 respectively.

[0044] Further, the indicating unit includes: a first indicator light D1, a second indicator light D2, and a third indicator light D3; two ends of the first indicator light D1 are respectively connected to the first end of the coil of the first relay KA1 and the positive power supply of the mainboard 100 to be checked; two ends of the second indicator light D2 are respectively connected to the first end of the coil of the second relay KA2 and the positive power supply of the mainboard 100 to be checked; two ends of the third indicator light D3 are respectively connected to the first end of the coil of the third relay KA3 and the positive power supply of the mainboard 100 to be checked. Preferably, the utility model is provided with four mainboard checking branches, which are respectively used to check the probe data signals under -10℃, 25℃, 50℃, and 120℃ environments.

[0045] In the -10℃ motherboard verification branch, the first end of the coil of the first relay KA1-1 is connected to the positive pole of the power supply unit 1 through the switching unit 2 and the ammeter, the second end of the coil of the first relay KA1-1 is connected to the negative pole of the power supply unit 1, the negative pole of the power supply of the motherboard 100 to be verified is connected to the negative pole of the power supply unit 1, and the positive pole of the power supply of the motherboard 100 to be verified is connected to the first end of the coil of the first relay KA1-1; the first signal end of the motherboard 100 to be verified, the normally open contact of the first relay KA1-1, the adjustable resistor X11, and the second signal end of the motherboard 100 to be verified are connected in series to form a loop, and the two ends of the first indicator light D1-1 are respectively connected to the first end of the coil of the first relay KA1-1 and the positive pole of the power supply of the motherboard 100 to be verified.

[0046] In the 25℃ mainboard verification branch, the first end of the coil of the first relay KA1-2 is connected to the positive pole of the power supply unit 1 through the switching unit 2 and the ammeter, the second end of the coil of the first relay KA1-2 is connected to the negative pole of the power supply unit 1, the negative pole of the power supply of the mainboard 100 to be verified is connected to the negative pole of the power supply unit 1, and the positive pole of the power supply of the mainboard 100 to be verified is connected to the first end of the coil of the first relay KA1-2; the first signal end of the mainboard 100 to be verified, the normally open contact of the first relay KA1-2, the adjustable resistor X12, and the second signal end of the mainboard 100 to be verified are connected in series to form a loop, and the two ends of the first indicator light D1-2 are respectively connected to the first end of the coil of the first relay KA1-2 and the positive pole of the power supply of the mainboard 100 to be verified.

[0047] In the 50℃ mainboard verification branch, the first end of the coil of the first relay KA1-3 is connected to the positive pole of the power supply unit 1 through the switching unit 2 and the ammeter, the second end of the coil of the first relay KA1-3 is connected to the negative pole of the power supply unit 1, the negative pole of the power supply of the mainboard 100 to be verified is connected to the negative pole of the power supply unit 1, and the positive pole of the power supply of the mainboard 100 to be verified is connected to the first end of the coil of the first relay KA1-3; the first signal end of the mainboard 100 to be verified, the normally open contact of the first relay KA1-3, the adjustable resistor X13, and the second signal end of the mainboard 100 to be verified are connected in series to form a loop, and the two ends of the first indicator light D1-3 are respectively connected to the first end of the coil of the first relay KA1-3 and the positive pole of the power supply of the mainboard 100 to be verified.

[0048] In the 120℃ motherboard verification branch, the first end of the coil of the first relay KA1-4 is connected to the positive pole of the power supply unit 1 through the switching unit 2 and the ammeter, the second end of the coil of the first relay KA1-4 is connected to the negative pole of the power supply unit 1, the negative pole of the power supply of the motherboard 100 to be verified is connected to the negative pole of the power supply unit 1, and the positive pole of the power supply of the motherboard 100 to be verified is connected to the first end of the coil of the first relay KA1-4; the first signal end of the motherboard 100 to be verified, the normally open contact of the first relay KA1-4, the adjustable resistor X14, and the second signal end of the motherboard 100 to be verified are connected in series to form a loop, and the two ends of the first indicator light D1-4 are respectively connected to the first end of the coil of the first relay KA1-4 and the positive pole of the power supply of the motherboard 100 to be verified.

[0049] The utility model is also provided with a calibration device box for accommodating the power supply unit 1, the switching unit 2, the mainboard calibration unit 3 and the probe calibration unit 4.

[0050] The calibration device box includes: a box body and a panel 5; a power supply unit 1, a switching unit 2, a mainboard calibration unit 3 and a probe calibration unit 4 are placed in the box body; an ammeter is arranged on the panel 5. Based on this arrangement, the entire device has the characteristic of being portable.

[0051] Since each unit has been placed in the calibration device box, for ease of use, the utility model also includes: a probe socket 6 arranged on the panel 5, the probe socket 6 is serially connected in the probe calibration unit 4, and is used to connect the probe 101 to be calibrated. During specific use, the probe 101 to be calibrated can be directly inserted into the probe socket 6.

[0052] Similarly, the utility model also includes: a motherboard socket 7 arranged on the panel 5, the motherboard socket 7 is connected in series in the motherboard verification unit 3, and is used to connect the motherboard 100 to be verified. During specific use, the motherboard 100 to be verified can be directly inserted into the motherboard socket 7.

[0053] The power supply unit 1 includes: a DC power supply and a power switch 11, and the DC power supply is connected to the switching unit 2 through the power switch 11; the power switch 11 is arranged on the panel 5, and the DC power supply includes: a 24V DC power supply and a 12V DC power supply, the 24V DC power supply is used to provide power for the mainboard verification unit 3 and the probe verification unit 4, and the 12V DC power supply is used to provide power for the temperature controller 41.

[0054] Next, the utility model is further explained in conjunction with the specific implementation process, as follows:

[0055] When the probe 101 to be calibrated is calibrated, the power supply is connected to the probe calibration unit 4 through the switching unit 2, and the probe 101 to be calibrated is inserted into the probe socket 6. The power supply is connected to the abnormal temperature calibration branch through the switching unit 2, and the second indicator light D2 is lit, indicating that the abnormal temperature calibration branch is energized. At this time, a 0°C environment is generated through the temperature controller 41, and the user observes the data of the ammeter to determine whether the probe data is within the normal range.

[0056] Insert the probe 101 to be calibrated into the probe socket 6, and connect the power supply to the normal temperature calibration branch through the switching unit 2. The third indicator light D3 lights up, indicating that the normal temperature calibration branch is energized. At this time, under normal temperature environment, the user observes the data of the ammeter to determine whether the probe data is within the normal range.

[0057] When the probe 101 to be calibrated is calibrated, the power supply is connected to the mainboard calibration unit 3 through the switching unit 2, the mainboard 100 to be calibrated is inserted into the mainboard socket 7, the power supply is connected to the mainboard calibration branch through the switching unit 2, and the first indicator light D1 is lit, indicating that the mainboard calibration branch is energized. Taking the temperature sensor model QAE2174.010 as an example, it can be found from the technical parameters in the manual that this model of temperature sensor uses Pt1000 as a temperature sensing element, and its resistance at different temperatures is as follows: the resistance of the probe is 961Ω at -10℃, 1097Ω at 25℃, 1194Ω at 50℃, and 1460Ω at 120℃. The mainboard circuit resistance is set to 961Ω, 1097Ω, 1194Ω, and 1460Ω through the adjustable resistor, and the ammeter probe data is observed to see whether it is within the normal range.

[0058] The utility model connects the probe of the temperature sensor to the calibration device through the probe socket on the calibration device. The calibration device is provided with a temperature controller, a thermometer and a calibration mainboard to form a probe calibration unit. After the probe to be verified is connected, it switches to different probe calibration branches through a switching unit to realize the value calibration of the probe to be verified under a specified environment, and quickly judges whether the probe data of the temperature sensor is normal; the mainboard to be verified is connected to the calibration device through the mainboard to be verified on the calibration device, and the mainboard calibration unit is formed by variable resistors. After the mainboard to be verified is connected, it switches to different mainboard calibration branches through the switching unit to realize the value calibration of the mainboard to be verified under a specified environment, and quickly judges whether the mainboard data of the mainboard to be verified is normal.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A calibration device for a temperature sensor, the temperature sensor comprising a probe and a mainboard, characterized in that: include: Power supply unit, switching unit, mainboard calibration unit, ammeter and probe calibration unit; The power supply unit is connected to the mainboard calibration unit and the probe calibration unit through the ammeter and the switching unit; The mainboard verification unit is connected to the mainboard to be verified, and is used to simulate the probe for verification of the mainboard to be verified; The probe calibration unit is connected to the probe to be calibrated and is used to calibrate the probe to be calibrated of the analog mainboard.

2. The verification device according to claim 1, characterized in that: The mainboard verification unit includes a plurality of mainboard verification branches; The power supply unit is connected to each of the mainboard verification branches through the switching unit; The mainboard verification branch includes: a first relay and an adjustable resistor; The first end of the coil of the first relay is connected to the positive electrode of the power supply unit through the switching unit and the ammeter, the second end of the coil of the first relay is connected to the negative electrode of the power supply unit, the negative electrode of the power supply of the mainboard to be checked is connected to the negative electrode of the power supply unit, and the positive electrode of the power supply of the mainboard to be checked is connected to the first end of the coil of the first relay; The first signal end of the mainboard to be checked, the normally open contact of the first relay, the adjustable resistor, and the second signal end of the mainboard to be checked are connected in series to form a loop.

3. The verification device according to claim 2, characterized in that: The probe calibration unit comprises: an abnormal temperature calibration branch and a normal temperature calibration branch; The abnormal temperature verification branch includes: a second relay, a temperature controller, a verified mainboard and a thermometer; The first end of the coil of the second relay is connected to the positive electrode of the power supply unit through the switching unit and the ammeter, the second end of the coil of the second relay is connected to the negative electrode of the power supply unit, the negative electrode of the power supply of the verified mainboard is connected to the negative electrode of the power supply unit, and the positive electrode of the power supply of the verified mainboard is connected to the first end of the coil of the second relay; The first signal terminal of the mainboard that has passed the verification, the normally open contact of the second relay, the probe to be verified, and the second signal terminal of the mainboard that has passed the verification are connected in series to form a loop, wherein the probe to be verified and the thermometer are placed in the temperature controller; The normal temperature verification branch includes: a third relay and a main board that has passed the verification; The first end of the coil of the third relay is connected to the positive electrode of the power supply unit through the switching unit and the ammeter, the second end of the coil of the third relay is connected to the negative electrode of the power supply unit, the negative electrode of the power supply of the mainboard that has passed the verification is connected to the negative electrode of the power supply unit, and the positive electrode of the power supply of the mainboard that has passed the verification is connected to the first end of the coil of the third relay; The first signal terminal of the main board that has passed the verification, the normally open contact of the third relay, the probe to be verified, and the second signal terminal of the main board that has passed the verification are connected in series to form a loop.

4. The verification device according to claim 3, characterized in that: Also includes: Indicator unit; the indicator unit is connected in series with the mainboard calibration unit and the probe calibration unit respectively.

5. The verification device according to claim 4, characterized in that: The indicating unit includes: a first indicating light, a second indicating light, and a third indicating light; The two ends of the first indicator light are respectively connected to the first end of the coil of the first relay and the positive pole of the power supply of the mainboard to be checked; Two ends of the second indicator light are respectively connected to the first end of the coil of the second relay and the positive pole of the power supply of the mainboard to be checked; The two ends of the third indicator light are respectively connected to the first end of the coil of the third relay and the positive pole of the power supply of the mainboard to be checked.

6. The verification device according to claim 1, characterized in that: Also includes: A calibration device box for accommodating the power supply unit, the switching unit, the mainboard calibration unit and the probe calibration unit.

7. The verification device according to claim 6, characterized in that: The verification device box comprises: a box body and a panel; The power supply unit, the switching unit, the mainboard calibration unit and the probe calibration unit are placed in the box; The ammeter is arranged on the panel.

8. The verification device according to claim 7, characterized in that: Also includes: A probe socket is arranged on the panel and is serially connected in the probe calibration unit for connecting a probe to be calibrated.

9. The verification device according to claim 7, characterized in that: Also includes: A mainboard socket is arranged on the panel and is connected in series in the mainboard verification unit for connecting the mainboard to be verified.

10. The verification device according to claim 7, characterized in that: The power supply unit comprises: a DC power supply and a power switch, wherein the DC power supply is connected to the switching unit via the power switch; The power switch is arranged on the panel.

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