Stem temperature sensor test and verification instrument

Abstract

The utility model discloses a pole type temperature sensor test check appearance. Among them, the pole type temperature sensor test check appearance includes: heating device, heating device includes first heating body, second heating body, direct current heating tube and probe thermocouple, direct current heating tube sets up in the first heating body inside, and the probe thermocouple sets up in the second heating body inside, and the first heating body and the second heating body are installed in the vertical direction staggered parallel, temperature controller is connected with heating device, is used for according to the signal control of probe thermocouple heating device's start and stop, first solid -state relay is connected with heating device and temperature controller, is used for controlling the switch -on and the switch -off of heating device power supply. The utility model solves the technical problem of low precision and poor safety in the temperature sensor test in the related art.

Description

Technical Field

[0001] This utility model relates to the field of sensor testing, and more specifically, to a rod-type temperature sensor testing and calibration instrument. Background Technology

[0002] Temperature sensors, as critical measurement tools, directly impact product quality and production safety through their accuracy and reliability. However, current testing and verification methods for temperature sensors often have limitations and safety hazards. Existing testing methods, such as using hot air guns or heating in oil, not only struggle to provide a stable and accurate testing temperature environment but also pose high operational risks, increasing the risk of burns or equipment damage. During hot air gun testing, the unstable airflow makes temperature distribution difficult to control, resulting in inconsistent temperature effects on different sensor locations and affecting test accuracy. Heating sensors in oil requires manual monitoring of the oil temperature, and the rate of temperature rise and fall is difficult to control precisely. Furthermore, the inherent heat transfer properties and uneven temperature distribution of oil further complicate the accuracy and consistency of the test temperature. In addition, these methods are poorly adaptable to various environments, complex to operate, and unsuitable for flexible temperature sensor testing in diverse settings. In summary, current temperature sensor testing technologies suffer from low accuracy and poor safety.

[0003] There is currently no effective solution to the above problems. Utility Model Content

[0004] This utility model provides a rod-type temperature sensor test and calibration instrument to at least solve the technical problems of low accuracy and poor safety in temperature sensor testing in related technologies.

[0005] According to one aspect of the present invention, a rod-type temperature sensor test and calibration instrument is provided, comprising: a heating device, the heating device including a first heating element, a second heating element, a DC heating tube, and a probe thermocouple, the DC heating tube being disposed inside the first heating element, the probe thermocouple being disposed inside the second heating element, and the first heating element and the second heating element being installed parallel to each other in a vertically offset manner; a temperature controller, connected to the heating device, for controlling the start and stop of the heating device according to the signal from the probe thermocouple; and a first solid-state relay, connected to the heating device and the temperature controller, for controlling the connection and disconnection of the power supply to the heating device.

[0006] Furthermore, the first heating element has a through hole in the vertical direction, the upper end of the second heating element has a first non-through hole in the vertical direction, and the lower end of the second heating element has a second non-through hole in the vertical direction. The DC heating tube is disposed in the through hole; the probe thermocouple is disposed in the first non-through hole; and the second non-through hole is used to insert a temperature sensor.

[0007] Furthermore, there are two through holes, one first non-through hole, and two second non-through holes.

[0008] Furthermore, the rod-type temperature sensor test and calibration instrument also includes: a DC converter, connected to the first solid-state relay and the heating device, used to convert AC power from the first voltage to a second voltage to power the heating device, wherein the second voltage is less than the first voltage.

[0009] Furthermore, the rod-type temperature sensor tester also includes a second solid-state relay, connected to the main power supply and temperature controller, used to control the connection and disconnection of the main power supply.

[0010] Furthermore, the rod-type temperature sensor tester also includes a power switch, located between the main power supply and the second solid-state relay, used to control the connection and disconnection between the main power supply and the second solid-state relay.

[0011] Furthermore, the rod-type temperature sensor tester also includes: a terminal block, which is connected to the main power supply, power switch, first solid-state relay and second solid-state relay, and is used to distribute power to the power switch, first solid-state relay and second solid-state relay.

[0012] Furthermore, the rod-type temperature sensor tester also includes: a protective housing and a protective base plate, wherein the heating device, temperature controller, first solid-state relay, second solid-state relay, power switch and terminal block are disposed on the protective base plate and inside the protective housing, and an opening is provided at a predetermined position on the upper surface of the protective housing, the predetermined position corresponding to the position of the second non-penetrating hole provided on the second heating element.

[0013] Furthermore, the rod-type temperature sensor tester also includes: a grounding wire connected to the protective housing; and an insulating plate installed on the bottom plate of the protective housing.

[0014] Furthermore, the rod-type temperature sensor tester also includes a fixed bracket, through which the heating device is fixed to the base plate of the protective cover.

[0015] Furthermore, a PTFE gasket is provided between the fixed bracket and the base plate of the protective cover.

[0016] Furthermore, the rod-type temperature sensor tester also includes a first indicator light, a second indicator light, and a third indicator light. The first indicator light is used to indicate whether the main power supply is on; the second indicator light is used to indicate that the heating device is in the heating state; and the third indicator light is used to indicate that the heating device is in the non-heating state.

[0017] In this embodiment of the utility model, a rod-type temperature sensor testing and calibration instrument includes a heating device, which comprises a first heating element, a second heating element, a DC heating tube, and a probe thermocouple. The DC heating tube is disposed inside the first heating element, and the probe thermocouple is disposed inside the second heating element. The first and second heating elements are installed parallel to each other in a vertically offset manner. A temperature controller is connected to the heating device and is used to control the start and stop of the heating device according to the signal from the probe thermocouple. A first solid-state relay is connected to the heating device and the temperature controller and is used to control the power supply of the heating device. This achieves the technical effect of using the first heating element and the DC heating tube to generate a heating effect, while the second heating element and the probe thermocouple provide a stable and accurate temperature signal. The temperature controller automatically adjusts the heating state according to the signal from the probe thermocouple, and the first solid-state relay is the key to power control, ensuring the power supply is switched on and off throughout the heating process. This achieves the technical effect of high-precision testing and calibration of the temperature sensor under safe conditions, thereby solving the technical problems of low accuracy and poor safety in temperature sensor testing in related technologies. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0019] Figure 1 A first structural schematic diagram of a rod-type temperature sensor test and calibration instrument according to an embodiment of the present invention is shown;

[0020] Figure 2 An electrical wiring diagram of a rod-type temperature sensor test and calibration instrument according to an embodiment of the present invention is shown.

[0021] Figure 3 A first structural schematic diagram of a heating element structure according to an embodiment of the present invention is shown;

[0022] Figure 4 A second structural schematic diagram of a heating element structure according to an embodiment of the present invention is shown;

[0023] Figure 5 A third structural schematic diagram of a heating element structure according to an embodiment of the present invention is shown;

[0024] Figure 6 This diagram shows a second structural schematic of a rod-type temperature sensor test and calibration instrument according to an embodiment of the present invention;

[0025] Figure 7A first structural schematic diagram of a protective device for a rod-type temperature sensor tester and calibrator provided according to an embodiment of the present invention is shown.

[0026] Figure 8 A second structural schematic diagram of a protective device for a rod-type temperature sensor tester and calibrator provided according to an embodiment of the present invention is shown.

[0027] The above figures include the following reference numerals:

[0028] 1. Heating device;

[0029] 11. First heating element;

[0030] 12. Second heating element;

[0031] 13. DC heating element; 14. Probe thermocouple;

[0032] 2. Temperature controller;

[0033] 31. First solid-state relay; 32. Second solid-state relay;

[0034] 4. DC converter;

[0035] 51. Power switch; 52. First indicator light; 53. Second indicator light; 54. Third indicator light;

[0036] 6. Terminal block;

[0037] 71. Protective housing; 72. Protective base plate; 73. Insulating plate; 74. Fixing bracket;

[0038] 8. Temperature sensor detection port. Detailed Implementation

[0039] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0040] like Figures 1 to 8As shown, this utility model embodiment provides a rod-type temperature sensor test and calibration instrument. The rod-type temperature sensor test and calibration instrument includes: a heating device 1, which includes a first heating element 11, a second heating element 12, a DC heating tube 13, and a probe thermocouple 14. The DC heating tube 13 is disposed inside the first heating element 11, and the probe thermocouple 14 is disposed inside the second heating element 12. The first heating element 11 and the second heating element 12 are installed parallel to each other in a vertically offset manner; a temperature controller 2, connected to the heating device 1, is used to control the start and stop of the heating device 1 according to the signal of the probe thermocouple 14; and a first solid-state relay 31, connected to the heating device 1 and the temperature controller 2, is used to control the connection and disconnection of the power supply to the heating device 1.

[0041] The rod-type temperature sensor test and calibration instrument provided in this embodiment comprises two core parts: a heating device and a control system. The heating device 1 consists of a first heating element 11, a second heating element 12, a DC heating tube 13, and a probe thermocouple 14. The DC heating tube 13 is embedded within the first heating element 11, while the probe thermocouple 14 is placed inside the second heating element 12. Notably, the first heating element 11 and the second heating element 12 are installed parallel to each other in a staggered manner along the vertical direction. This design ensures uniform heating and a clear test area, which is beneficial for accurate temperature sensor testing. Based on the connection relationship, the temperature controller 2 is closely connected to the heating device 1. It can receive temperature signals from the probe thermocouple 14 and intelligently control the start and stop of the heating device 1 based on these signals, thereby precisely adjusting the heating temperature to ensure that the test environment meets the set temperature conditions. In addition, the role of the first solid-state relay 31 is also important. It is connected to the heating device 1 on the one hand and communicates with the temperature controller 2 on the other. Its task is to automatically control the power supply of the heating device 1 to be turned on and off according to the instructions of the temperature controller 2. This automatic control mechanism can greatly improve the safety and efficiency of the test.

[0042] In summary, the rod-type temperature sensor test and calibration instrument of this embodiment can not only accurately provide the required test temperature for the temperature sensor, but also intelligently control the heating process, avoiding potential safety hazards and measurement inaccuracies in related testing methods, thus significantly improving test quality and safety. Furthermore, the application of solid-state relays automates power control, reducing manual intervention and further enhancing the instrument's reliability and user-friendliness.

[0043] like Figure 3 and Figure 4As shown, the first heating element 11 has a through hole in the vertical direction, the upper end of the second heating element 12 has a first non-through hole in the vertical direction, and the lower end of the second heating element 12 has a second non-through hole in the vertical direction. The DC heating tube 13 is disposed in the through hole; the probe thermocouple 14 is disposed in the first non-through hole; and the second non-through hole is used to insert a temperature sensor.

[0044] By adopting the above structure, a through hole is provided in the first heating body 11 to accommodate the DC heating tube 13, and a first non-through hole is provided at the upper end of the second heating body 12 for installing the probe thermocouple 14, and a second non-through hole is provided at the lower end for inserting the temperature sensor. This allows for precise separation and positioning of the heating source, temperature detection and the sensor under test. This ensures that the temperature sensor can contact an accurate and uniform temperature environment during testing. At the same time, the probe thermocouple 14 provides high-precision temperature feedback, which enhances the accuracy and reliability of the test.

[0045] Optionally, during operation, when testing the temperature sensor, simply insert it into the second non-penetrating hole of the second heating element 12, and then start the test calibrator. The DC heating tube 13 heats the first heating element 11, and heat is transferred to the second heating element 12 through contact. The probe thermocouple 14 monitors the temperature of the second heating element 12 in real time and transmits the signal to the temperature controller 2. The temperature controller 2 intelligently adjusts the working state of the heating device 1 according to the signal until the preset target temperature is reached. At this point, the temperature of the environment where the temperature sensor is located is the set temperature. By observing and analyzing the sensor's output signal, the sensor's performance and accuracy can be determined. This method not only improves the convenience and efficiency of testing but also significantly enhances the accuracy and reliability of testing, avoiding test errors caused by uneven heating and temperature instability in related technologies, thus providing strong support for the quality control and performance verification of temperature sensors.

[0046] like Figure 3 As shown, there are two through holes, one first non-through hole, and two second non-through holes.

[0047] With the above structure, the two through holes on the first heating element 11 are used to insert two DC heating tubes 13. This dual-heating-tube design can significantly improve the heating speed and the uniformity of heat distribution, ensuring that the entire heating element can quickly reach and maintain a stable test temperature. Simultaneously, the presence of two heating tubes facilitates future maintenance or replacement of heating components. Even if one heating tube malfunctions, the other can continue to maintain the necessary heating function, improving the stability and lifespan of the calibrator. Regarding the second heating element 12, the first non-through hole is used to house the probe thermocouple 14, which can accurately monitor the center temperature of the heating element and provide accurate feedback signals to the temperature controller 2, thereby achieving precise control of the heating process. The two second non-through holes can accommodate different types of temperature sensor testing needs, allowing simultaneous or independent testing of two sensors, significantly improving testing efficiency. In actual operation, the tester can choose to insert the sensor into any one or two holes according to the specific situation, flexibly handling various testing scenarios, whether it is detailed calibration of a single sensor or batch testing of multiple sensors.

[0048] Optionally, in the specific operation process, firstly, select an appropriate number of holes according to the test requirements, insert the temperature sensor into the second non-penetrating hole, and then start the test calibrator. Two DC heating tubes 13 simultaneously heat the first heating element 11, and the heat is rapidly and evenly conducted to the second heating element 12. The probe thermocouple 14 monitors the temperature and sends a signal to the temperature controller 2. The temperature controller 2 automatically adjusts the working state of the heating device 1 according to the signal to ensure that the test environment reaches the set temperature. After the test is completed, the sensor's output signal is compared with the actual temperature to evaluate its performance and accuracy.

[0049] In this embodiment, on the one hand, the dual-hole design can improve the heating efficiency and temperature control accuracy of the calibrator, ensuring the reliability and consistency of test results; on the other hand, the increase in test holes can enhance the instrument's versatility and testing efficiency, ensuring that more sensors can be tested in a shorter time. Furthermore, the dual-hole design also considers the maintainability and long-term operational stability of the tester. The redundant heating tube configuration reduces the risk of the entire tester failing due to a single component malfunction.

[0050] Optionally, the first heating element 11 and the second heating element 12 can be cuboid structures (e.g., corresponding to cuboid No. 1 and cuboid No. 2), and can be made of austenitic stainless steel. All holes on the heating elements (e.g., through holes, first non-through holes, second non-through holes) are circular holes (referred to as round holes). For example, two cuboids, each 350mm high and 40mm long and wide, can be made of austenitic stainless steel, namely cuboid No. 1 and cuboid No. 2. Two parallel round holes, each 10mm in diameter, are made on the top of each cuboid. The round hole in cuboid No. 1 penetrates the cuboid, while the round hole in cuboid No. 2 does not penetrate; the depth of the round hole is 10mm below the bottom of the cuboid. A round hole with a diameter of 4mm and a depth of 40mm is made next to the round hole on the bottom of cuboid No. 2. Accordingly, 132 DC heating tubes (21V each), each 370mm long and 9.8mm in diameter, are installed; and 141 probe thermocouples, each 3.9mm in diameter and 40mm long, are installed. During assembly, two DC heating tubes are inserted into the two through holes of cuboid 1, and one end is connected with a wire. The probe thermocouple 14 is inserted into the 4mm diameter hole on the lower side of cuboid 2. Cuboid 2 is then installed parallel to cuboid 1, offset from it, with cuboid 2 50mm higher than cuboid 1.

[0051] like Figure 2 and Figure 6 As shown, the rod-type temperature sensor tester also includes: a DC converter 4, which is connected to the first solid-state relay 31 and the heating device 1, and is used to convert the AC power from the first voltage to the second voltage to power the heating device 1. The second voltage is less than the first voltage.

[0052] By adopting the above structure, the introduction of the DC converter 4 can solve the safety hazards and voltage matching problems that may arise from direct AC power supply. In practical applications, the voltage of AC power (such as 220V or 110V) is much higher than the voltage required by the heating device 1. Direct use of AC power may cause the heating device 1 to overheat, be damaged, or even cause a safety accident. However, the DC converter 4 can convert the input high-voltage AC power into low-voltage DC power suitable for the heating device 1. This process not only ensures the safe operation of the heating device 1 but also improves the power conversion efficiency and reduces energy loss.

[0053] Optionally, the DC converter can convert the input 220V AC power into an output 42V DC power of 1000W. In actual operation, when the test calibrator is started, the user first controls the first solid-state relay 31 to turn on via power switch 51. Then, the DC converter 4 starts working, converting the input AC power (first voltage) into the required DC power (second voltage). The second voltage is designed according to the specific requirements of the heating device 1 and can be set lower than the first voltage to ensure that the heating element operates at a safe operating voltage. The converted DC power flows to the heating device 1 under the control of the first solid-state relay 31, and the heating element begins to heat until the temperature controller detects the set temperature. Then, by controlling the second solid-state relay 32, the power supply to the heating device 1 is disconnected, stopping the heating process.

[0054] Through this embodiment, firstly, the use of DC converter 4 can improve the safety of the test calibrator. Through voltage conversion, the potential risks of directly connecting high voltage to heating device 1 can be avoided, providing a safer testing environment for experimenters. Secondly, the high-efficiency power conversion characteristics of DC converter 4 can reduce energy loss, improve testing efficiency, and also help reduce overall energy consumption. Finally, this design can also enhance the flexibility and adaptability of the instrument. The output voltage of DC converter 4 can be adjusted according to different heating devices 1 or specific testing requirements to adapt to a wider range of testing scenarios.

[0055] like Figure 2 and Figure 6 As shown, the rod-type temperature sensor tester also includes a second solid-state relay 32, which is connected to the main power supply and the temperature controller 2 and is used to control the connection and disconnection of the main power supply.

[0056] With the aforementioned structure and the introduction of the second solid-state relay 32, the rod-type temperature sensor test and calibration instrument can more intelligently manage the power supply status of the main power supply, realizing automatic start and stop of the heating process. In test and calibration instruments of related technologies, power management often relies on manual operation or simple mechanical switches. This method is not only inefficient, but also prone to equipment damage or safety hazards in case of improper operation or emergencies. However, through the second solid-state relay 32, the instrument can also automatically control the connection and disconnection of the main power supply according to the instructions of the temperature controller 2, ensuring that the heating device 1 stops heating in time after reaching the preset temperature, avoiding overheating or wasting electrical energy.

[0057] Optionally, during operation, after the tester sets the target temperature of the temperature controller 2 and starts the instrument, the first solid-state relay 31 is activated, and the DC-DC converter 4 begins to work, converting the AC power into DC power suitable for the heating device 1. At this time, the second solid-state relay 32 is also activated under the control of the temperature controller 2, providing a path for the main power supply, and the DC power flows smoothly to the heating tube, starting the heating process. When the temperature controller 2 detects that the temperature of the heating element has reached the set value, it issues a command to deactivate the second solid-state relay 32, cutting off the main power supply, and the heating tube stops heating. This process is automatic and continuous, requiring no manual intervention, which can significantly improve the accuracy and safety of the test.

[0058] Through this embodiment, on the one hand, since the second solid-state relay 32 can automatically adjust the heating state based on the real-time feedback from the temperature controller 2, excessive temperature fluctuations can be avoided, ensuring the accuracy and consistency of the test temperature. On the other hand, the automatic power-off mechanism can effectively prevent the heating element from overheating, avoiding potential equipment damage or personal injury due to temperature runaway, and providing a safer testing environment for testers. In addition, by finely controlling the heating process, unnecessary energy consumption can also be reduced.

[0059] like Figure 2 , Figure 7 and Figure 8 As shown, the rod-type temperature sensor tester also includes a power switch 51, which is located between the main power supply and the second solid-state relay 32, and is used to control the connection and disconnection between the main power supply and the second solid-state relay 32.

[0060] With the above structure, the rod-type temperature sensor tester and calibrator achieve both ease of operation and safety. The addition of power switch 51 forms the first line of defense for the instrument's power management. Operators can easily control the circuit connection between the main power supply and the second solid-state relay 32 through intuitive manual operation, thereby controlling the start and stop of the entire heating system. This design simplifies the instrument's operation process, allowing even non-professional testers to quickly learn how to use it and reducing the possibility of misoperation.

[0061] Optionally, before using the test calibrator, the operator should first confirm that all parameters are set correctly, including the target temperature and the safety of the test environment. Then, by operating the power switch 51, the main power supply and the second solid-state relay 32 can be safely connected to start the instrument for heating. When the test is completed or needs to be interrupted, operating the power switch 51 again will disconnect the circuit between the main power supply and the second solid-state relay 32, stopping the heating. During this process, the power switch 51 plays a crucial role in ensuring the controllability and safety of the heating process.

[0062] In this embodiment, the operator does not need to have a deep understanding of the instrument's internal circuitry; simply operating the power switch 51 is sufficient to easily control the heating system's operating status, lowering the barrier to entry. Secondly, the presence of the power switch 51 adds an extra layer of physical isolation to the entire heating process. Even in the event of an emergency, such as an abnormal temperature rise or circuit failure, the operator can quickly disconnect the power switch 51 to cut off the power supply and prevent accidents.

[0063] like Figure 2 and Figure 6 As shown, the rod-type temperature sensor tester also includes: a terminal block 6, which is connected to the main power supply, power switch 51, first solid-state relay 31 and second solid-state relay 32, and is used to distribute power to the power switch 51, first solid-state relay 31 and second solid-state relay 32.

[0064] With the above structure, terminal block 6, as the core component of power distribution, can effectively integrate the circuit connections between the main power supply, power switch 51, first solid-state relay 31, and second solid-state relay 32, ensuring stable current transmission and accurate distribution. In complex electrical circuits, terminal block 6 not only simplifies wiring and improves the convenience of installation and maintenance, but more importantly, it optimizes the circuit architecture, reduces mutual interference between circuits, and enhances the overall stability and safety of the calibrator.

[0065] Optionally, during operation, when the operator is ready to use the test calibrator, they first establish a connection between the main power supply and the entire calibrator via power switch 51. At this time, terminal block 6 begins to play its crucial role in distributing power, precisely guiding the current provided by the main power supply to each circuit module, including the first solid-state relay 31 and the second solid-state relay 32. With the second solid-state relay 32 activated, the current is further guided to the DC converter 4 via terminal block 6, converting it into DC power suitable for the heating device 1; the activation of the first solid-state relay 31, under the command of the temperature controller, allows terminal block 6 to transmit DC power to the heating device 1, initiating the heating process. Throughout the testing process, terminal block 6 continuously monitors and adjusts the current distribution, ensuring that each circuit module receives the required power while preventing overload or other circuit malfunctions.

[0066] This embodiment can significantly improve the reliability of connections between circuit modules, make the current transmission path clearer, and reduce the failure rate caused by complex wiring; at the same time, it can optimize the power distribution strategy, achieve efficient and stable power supply, and create favorable conditions for the normal operation of heating device 1.

[0067] like Figure 7 and Figure 8As shown, the rod-type temperature sensor tester also includes: a protective housing 71 and a protective base plate 72. The heating device 1, temperature controller 2, first solid-state relay 31, second solid-state relay 32, power switch 51, and terminal block 6 are disposed on the protective base plate 72 and inside the protective housing 71. An opening is provided at a predetermined position on the upper surface of the protective housing 71, and the predetermined position corresponds to the position of the second non-penetrating hole provided on the second heating element 12.

[0068] With the above structure, key electrical components such as the heating device 1, temperature controller 2, first solid-state relay 31, second solid-state relay 32, power switch 51, and terminal block 6 are centrally located on the base plate 72 of the protective cover and all housed inside the protective housing 71. This layout not only significantly reduces the space occupied by the instrument but also ensures that all electrical components are protected from external environmental influences, improving the stability and durability of the calibrator. Simultaneously, the opening design on the upper surface of the protective housing 71 allows the temperature sensor to be inserted into the pre-set hole in the second heating element 12 for testing. When testing the temperature sensor, the operator does not need to open the entire protective housing 71; simply insert the sensor under test through the top opening to begin the test, saving time and ensuring a simple and smooth operation.

[0069] Optionally, during operation, the user can open the door or cover of the protective housing 71 to see the neatly arranged electrical components inside. The power switch 51 on the outside of the housing allows for safe control of the entire calibrator's power supply. During testing, the operator only needs to focus on the temperature control panel outside the housing 71, set the desired temperature, and then all heating control and power management will be automatically handled by the calibrator's internal electrical system. This eliminates the need for direct contact or operation of the electrical components inside the housing 71, greatly improving operational safety.

[0070] In this embodiment, the protective housing 71 forms an effective protective barrier for the internal electrical components, effectively preventing the corrosion of electrical components by adverse environmental factors such as dust and moisture, and extending the service life of the calibrator. Simultaneously, the calibrator's appearance design and space utilization, integrating all key components onto the housing base plate 72, makes the instrument look more concise and professional, while reducing its footprint, making it suitable for use in compact laboratories or production lines. Furthermore, the enclosed design of the electrical components reduces the probability of operators accidentally coming into contact with high-voltage or high-temperature components. The housing 71 also possesses certain heat insulation and electrical insulation capabilities, further ensuring the personal safety of testing personnel.

[0071] Optionally, a sleeve is provided on the opening at a predetermined position on the upper surface of the protective housing 71. For example, a 50mm round hole is opened at the center point of the upper right corner of the upper side of the protective housing 71, 10mm away from the edge. A 50mm high round sleeve is welded on the upper side of the round hole. The upper side of the second heating element 12 (such as the No. 2 cuboid) in the heating device 1 extends out at this round hole.

[0072] Optionally, the protective housing 71 can be made of 1.5mm thick stainless steel plate, forming a rectangular stainless steel protective housing with a width of 29cm, a length of 39cm, and a height of 40cm. The base plate 72 of the protective housing is detachable and fixed to the protective housing 71 with four bolts (one on each side). A rectangular handle can also be installed in the middle of the upper side of the protective housing 71 to facilitate the movement of the testing instrument and make it easy to carry.

[0073] Optionally, a hole corresponding to the temperature controller 2 can be provided on the front of the protective housing 71 for mounting the temperature controller 2. Specifically, the temperature controller 2 may include a control device and a display device, wherein the display device is embedded in the corresponding hole on the front of the protective housing 71, while the control device is located inside the protective housing 71, allowing the user to more intuitively see the current temperature status of the calibrator. For example, a 66mm square hole can be made at the center point 10cm below the top of the front of the protective housing 71, where the temperature controller can be installed.

[0074] like Figure 6 As shown, the rod-type temperature sensor tester also includes: a grounding wire connected to the protective housing 71; and an insulating plate 73 installed on the protective base plate 72.

[0075] The above structure, with the grounding wire connected to the housing 71 and the plastic base plate 72, together form the electrical safety protection network of the calibrator, providing additional safety for testers. Specifically, the grounding wire connection is a crucial aspect of electrical safety design. During instrument startup and operation, in the event of an electrical fault, such as a short circuit or leakage, the grounding wire can quickly conduct the fault current to the ground, preventing injury or damage from current passing through the human body or other equipment. This provides a safe electrical environment for testers during operation and reduces the risk of electrical accidents. An insulating plate 73, which can be made of plastic, is installed on the base plate 72. This not only reduces the weight of the instrument but, more importantly, the excellent insulation properties of plastic effectively isolate electrical components from direct contact with the operator, preventing electric shock and other accidents. Furthermore, the plastic plate possesses certain heat resistance and chemical corrosion resistance, providing a relatively stable working environment for the internal electrical components, free from external environmental interference, thus extending the service life of the calibrator.

[0076] Optionally, a rectangular plastic board 27cm wide and 37cm long can be made from a 4mm thick plastic sheet as an insulation board 73, which is installed on the upper side of the base plate 72 of the protective cover and fixed with 4 bolts.

[0077] like Figures 1 to 3 As shown, the rod-type temperature sensor tester also includes a fixed bracket 74, and the heating device 1 is fixed on the base plate 72 of the protective cover through the fixed bracket 74.

[0078] The aforementioned structure and the introduction of the fixing bracket 74 not only ensure the stable fixation of the heating device 1 on the protective cover base plate 72, but also optimize the layout of the internal components of the calibrator, facilitating subsequent maintenance and inspection. The combination of the fixing bracket 74 and the heating device 1 ensures the stability of the heating element during heating, avoiding temperature measurement errors caused by vibration or movement. In actual operation, the tester can place the temperature sensor in the sensor detection hole, and the heating device 1 is firmly fixed to the protective cover base plate 72 by the fixing bracket 74. Even slight vibrations during heating will not affect the position of the heating element or the heating effect, thus ensuring the accuracy of the test results. The design of the fixing bracket 74 takes into account the spatial relationship between the heating device 1 and other electrical components. Through reasonable arrangement, the heating device 1 is effectively surrounded by heat insulation material while ensuring a reasonable distance from other important components such as the temperature controller 2 and solid-state relays, avoiding adverse effects of heat radiation on sensitive electronic components. It also facilitates the arrangement of power cords and the connection of the terminal block 6.

[0079] Optionally, the fixing bracket 74 can be an L-shaped bracket made of 3mm thick stainless steel plate, which is installed on the underside of the first heating element 11 (such as cuboid 1).

[0080] As an optional embodiment, a PTFE gasket is provided between the fixed bracket 74 and the protective cover base plate 72.

[0081] With the above structure, a PTFE gasket, a high-performance, high-temperature resistant material, is placed between the fixed bracket 74 and the base plate 72 of the protective cover, effectively isolating the high temperature generated during the operation of the heating device 1. When the heating device 1 operates at a high temperature, the PTFE gasket prevents the high temperature from being directly transferred to the base plate 72, preventing the base plate from deforming or being damaged due to excessive heat. It also avoids the potential impact of high temperature on other electrical components on the base plate, enhancing the thermal stability of the instrument. Simultaneously, the PTFE gasket possesses excellent chemical stability and wear resistance, maintaining its physical and chemical properties even under long-term high-temperature environments, and is not prone to aging or damage. This characteristic makes the connection between the base plate 72 and the heating device 1 more robust and reliable, reducing loosening or wear caused by thermal expansion and contraction, thereby extending the overall service life of the instrument and reducing maintenance costs.

[0082] like Figure 7 and Figure 8 As shown, the rod-type temperature sensor tester also includes a first indicator light 52, a second indicator light 53, and a third indicator light 54. The first indicator light 52 is used to indicate whether the main power supply is on; the second indicator light 53 is used to indicate that the heating device 1 is in the heating state; and the third indicator light 54 is used to indicate that the heating device 1 is in the non-heating state.

[0083] Optionally, the first indicator light 52, the second indicator light 53, and the third indicator light 54 can display different colors. For example, the first indicator light 52 can be set to a red power indicator, the second indicator light 53 to a yellow heating indicator, and the third indicator light 54 to a green heating completion indicator. Optionally, a 20mm round hole can be opened on the side of the protective cover 71 to install a fastening head to fix the power cord.

[0084] Using the above structure, the first indicator light 52 (red power indicator light) indicates whether the main power supply is connected. When the power switch 51 is turned on, the first indicator light 52 lights up, intuitively telling the operator that the instrument is ready to start working. The second indicator light 53 (yellow heating indicator light) lights up when the heating device 1 starts heating, indicating that the instrument is heating up to the set temperature, allowing the operator to clearly understand the progress of the heating process. The third indicator light 54 (green heating completion indicator light) lights up after the heating device 1 reaches the set temperature and stops heating, indicating to the operator that the temperature sensor test can begin. The indicator light system not only simplifies the operation process but also provides clear safety prompts for the operator. For example, during the heating process, the yellow indicator light reminds the operator that the heating device 1 is working and that contact with the heated area should be avoided to prevent burns. When the green indicator light is on, it means that the heating process is over, and the temperature sensor can be safely inserted or removed, thereby reducing safety hazards caused by misoperation. In addition, the use of indicator lights can also simplify the maintenance of the calibrator. For example, when the instrument fails to start, the operator can first check whether the first indicator light 52 is on to determine whether it is a power problem or another fault. If the yellow indicator light does not illuminate as expected during the heating process, it can quickly pinpoint a possible fault in heating device 1 or related circuitry, thereby accelerating the troubleshooting and resolution of the problem.

[0085] Optionally, four holes can be provided below the corresponding holes of the temperature controller 2 on the front of the protective housing 71 for installing the first indicator light 52, the second indicator light 53, the third indicator light 54, and the power switch 51. This facilitates user operation and allows for easy observation of the indicator light status, providing a more intuitive view of the current operating status of the rod-type temperature sensor tester. For example, four 20mm round holes can be horizontally and evenly drilled 50mm below the square hole corresponding to the temperature controller 2 on the front of the protective housing 71. The rotary switch and indicator lights (i.e., the first indicator light 52, the second indicator light 53, and the third indicator light 54) are installed here.

[0086] Optionally, in the rod-type temperature sensor tester of this embodiment, three circular holes can be opened on the sides of the first heating element 11 and the second heating element 12 respectively. The three circular holes are evenly distributed on the corresponding heating elements. For example, the heating elements can be divided into three equal segments, and a circular hole can be opened at the center of each segment. That is, a circular hole is opened at the top, middle, and bottom center of the side of the first heating element 11 without tapping, and a circular hole is opened at the top, middle, and bottom center of the side of the second heating element 12 for tapping. Taking the first heating element 11 and the second heating element 12 as cuboid structures (referred to as cuboid 1 and cuboid 2), a 6mm circular hole can be opened at the top, middle, and bottom center of the side of cuboid 1 without tapping, and a 5mm circular hole can be opened at the top, middle, and bottom center of the side of cuboid 2 for tapping.

[0087] Based on the above embodiments and optional embodiments, this utility model proposes an optional implementation of a rod-type temperature sensor test and calibration instrument. The calibration instrument includes: a protective device, a heating device 1, and electrical components, wherein:

[0088] The protective device includes a protective housing 71 and a protective base plate 72. The protective housing 71 is made of 1.5mm thick stainless steel plate, forming a rectangular stainless steel protective housing with a width of 29cm, a length of 39cm, and a height of 40cm. The protective base plate 72 is detachable and fixed to the protective housing 71 with four bolts (one on each side). A rectangular plastic plate, 27cm wide and 37cm long, made of 4mm thick plastic sheet, is installed on the upper side of the protective base plate 72 and fixed with four bolts. A rectangular handle is installed in the middle of the upper side of the stainless steel protective housing 71. A 50mm round hole is drilled at the center point of the upper right corner of the upper side of the protective housing 71, 10mm from the edge. A 50mm high round tube is welded to the upper side of the round hole, through which the upper side of the heating device (rectangular block 12) extends. A 66mm square hole is drilled at the center point 10cm downwards on the upper front side of the protective housing 71; the temperature controller is installed here. Four 20mm round holes are evenly spaced 50mm below the square opening. The rotary switch and indicator light are installed here. A 20mm round hole is made on the side of the protective housing 71 to install a fastener to secure the power cord.

[0089] The heating device 1 includes a heating element, a DC heating tube 13, a probe thermocouple 14, and a fixing bracket 74. The heating element is made of austenitic stainless steel and consists of two cuboids, 350mm high and 40mm long and wide (i.e., cuboid 1 and cuboid 2). Two parallel circular holes, each 10mm in diameter, are made on the top of each cuboid. The hole in cuboid 1 penetrates the entire cuboid, while the hole in cuboid 2 does not penetrate; the hole is located 10mm below the bottom of cuboid 2. Next to the hole on the bottom of cuboid 2, a circular hole with a diameter of 4mm and a depth of 40mm is made. Three 5mm circular holes are made on the sides of cuboid 2, centered at the top, middle, and bottom, and tapped. Three 6mm circular holes are made on the sides of cuboid 1, centered at the top, middle, and bottom, without tapping. The DC heating tube 13 consists of two heating tubes, each 370mm long and 9.8mm in diameter (21V each). The probe thermocouple 14 is 3.9mm in diameter and 40mm long. The fixing bracket 74 can be made into an L-shaped bracket using a 3mm thick stainless steel plate. During the assembly of the heating device 1, two DC heating tubes 13 are inserted into the two through-holes of cuboid 1, and one end is connected with an electric wire. The probe thermocouple 14 is inserted into the 4mm diameter hole on the lower side of cuboid 1. Cuboid 2 is installed parallel to cuboid 1 with a staggered position, and cuboid 2 is 50mm higher than cuboid 1. The fixing bracket 74 is installed on the lower side of cuboid 1. The function of the heating device 1 is to heat the heating element to the set temperature to provide the temperature sensor with the temperature required for measurement (heating temperature 0-300 degrees). The heating device 1 is fixed on the base plate 72 of the protective cover.

[0090] The electrical components include a temperature controller 2, a DC converter, solid-state relays, a terminal block 6, a power switch 51, and indicator lights. The temperature controller 2 controls the start and stop of the heating device 1 based on the signal output from the probe thermocouple 14 on the heating device 1. The set temperature can be customized. The DC converter converts the input 220V AC power into an output 42V DC power of 1000W. The solid-state relays include a first solid-state relay 31 and a second solid-state relay 32. The second solid-state relay 32 controls the main power supply connection and disconnection, while the first solid-state relay 31 controls the power supply connection and disconnection of the heating device 1. The terminal block 6 is used to connect wires for power distribution. The power switch 51 controls the connection and disconnection of the second solid-state relay 32. The indicator lights include a red power indicator, a yellow heating indicator, and a green heating completion indicator.

[0091] The specific control logic of this rod-type temperature sensor tester is as follows: When the rotary switch is turned on, the second solid-state relay 32 is activated, the instrument is powered on, and the red power indicator light illuminates. The temperature controller is powered on and begins to work, controlling the first solid-state relay 31 to activate, illuminating the yellow heating indicator light. The DC converter is powered on and outputs 42V DC power to the heating device 1, which begins to heat up. The probe thermocouple 14 continuously outputs signals to the temperature controller. After reaching the set value, the temperature controller controls the first solid-state relay 31 to deactivate, illuminating the green heating completion indicator light. The DC converter is powered off, and the heating device 1 stops heating. If the temperature is lower than the set temperature, the temperature controller controls the heating device 1 to heat up until the set temperature is reached, at which point heating stops. When the rotary switch is turned off, the second solid-state relay 32 deactivates, the instrument is powered off, and the red power indicator light goes out.

[0092] For safety protection, a layer of high-temperature resistant, fireproof, and heat-insulating material can be wrapped around the heating device 1 to prevent the high temperature of the heating device 1 from spreading. A plastic plate is installed on the bottom plate 72 of the protective cover for insulation, and electrical components are installed on the protective plate. The protective cover shell 71 is connected to a grounding wire for protection. A 50mm high round pipe is welded to the upper right corner of the upper side of the protective cover, near the edge, to prevent personnel from touching the heating device 1 and getting burned. A PTFE gasket is placed under the heating element fixing bracket 74 to prevent the heating element from overheating and damaging the plastic plate.

[0093] The specific operation procedure of this rod-type temperature sensor test and calibration instrument is as follows:

[0094] S1, Insert the sensor into the sensor detection hole;

[0095] S2, turn on the power switch 51;

[0096] S3, set the temperature;

[0097] S4, start heating;

[0098] S5, upon reaching the temperature, check the temperature sensor's temperature status;

[0099] S6, turn off the power switch 51.

[0100] The rod-type temperature sensor test and calibration instrument provided in the embodiments has the following beneficial effects:

[0101] (1) The design of the calibrator includes comprehensive safety protection measures, such as wrapping the heating device 1 with high temperature resistant fireproof and heat insulation material to prevent the spread of high temperature; covering the bottom plate 72 of the protective cover with plastic insulation board 73 to isolate electrical components from the operator; connecting the housing with grounding wire to discharge static electricity and abnormal current in time and reduce the risk of electric shock; the application of round tube protection and PTFE gasket effectively prevents burns caused by direct contact with the heating element and comprehensively protects the safety of the operator.

[0102] (2) The calibrator has a reasonable interface layout, a simple rotary switch for starting, and indicator lights that provide clear feedback on the working status. The protective housing 71 is easy to disassemble, facilitating the inspection and maintenance of electrical components. In addition, the sensor is easy to plug and unplug, allowing for rapid testing without complicated calibration steps, which can significantly improve work efficiency.

[0103] (3) The use of the fixed bracket 74 can ensure the stability of the heating element during the heating process and avoid uneven heating or component damage caused by vibration or thermal expansion and contraction. All electrical connection points are tapped to ensure the tightness and durability of the connection and extend the service life of the instrument.

[0104] (4) By precisely controlling the heating process, energy waste caused by overheating or ineffective heating can be avoided. At the same time, this design can reduce reliance on traditional heat sources (such as hot air guns and oil boiling methods) and reduce the long-term operating cost of the calibrator.

[0105] Furthermore, it should be noted that the optional or preferred implementation methods of this embodiment can be found in the relevant descriptions in the embodiments, and will not be repeated here.

[0106] The order of the above embodiments of the present invention is merely for description and does not represent the superiority or inferiority of the embodiments.

[0107] In the above embodiments of this utility model, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0108] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A rod-type temperature sensor testing and calibration instrument, characterized in that, include: A heating device, comprising a first heating element, a second heating element, a DC heating tube, and a probe thermocouple, wherein the DC heating tube is disposed inside the first heating element, and the probe thermocouple is disposed inside the second heating element, and the first heating element and the second heating element are installed in parallel with a vertical offset. A temperature controller, connected to the heating device, is used to control the start and stop of the heating device according to the signal from the probe thermocouple; A first solid-state relay is connected to the heating device and the temperature controller, and is used to control the power supply of the heating device to be turned on and off.

2. The rod-type temperature sensor test and calibration instrument according to claim 1, characterized in that, The first heating element has a through hole in the vertical direction, the upper end of the second heating element has a first non-through hole in the vertical direction, and the lower end of the second heating element has a second non-through hole in the vertical direction, wherein the DC heating tube is disposed in the through hole; The probe thermocouple is positioned in the first non-penetrated hole; The second non-penetrating hole is used to insert a temperature sensor.

3. The rod-type temperature sensor test and calibration instrument according to claim 2, characterized in that, There are two through holes, one first non-through hole, and two second non-through holes.

4. The rod-type temperature sensor test and calibration instrument according to claim 1, characterized in that, The rod-type temperature sensor test and calibration instrument also includes: A DC converter, connected to the first solid-state relay and the heating device, is used to convert AC power from a first voltage to a second voltage to power the heating device, wherein the second voltage is less than the first voltage.

5. The rod-type temperature sensor test and calibration instrument according to any one of claims 1 to 4, characterized in that, The rod-type temperature sensor test and calibration instrument also includes: The second solid-state relay is connected to the main power supply and the temperature controller, and is used to control the connection and disconnection of the main power supply.

6. The rod-type temperature sensor test and calibration instrument according to claim 5, characterized in that, The rod-type temperature sensor test and calibration instrument also includes: A power switch is located between the main power supply and the second solid-state relay, and is used to control the connection and disconnection between the main power supply and the second solid-state relay.

7. The rod-type temperature sensor test and calibration instrument according to claim 6, characterized in that, The rod-type temperature sensor test and calibration instrument also includes: The terminal block is connected to the main power supply, the power switch, the first solid-state relay, and the second solid-state relay, and is used to distribute electrical energy to the power switch, the first solid-state relay, and the second solid-state relay.

8. The rod-type temperature sensor test and calibration instrument according to claim 7, characterized in that, The rod-type temperature sensor test and calibration instrument also includes: The protective cover shell and the protective cover base plate, among which, The heating device, the temperature controller, the first solid-state relay, the second solid-state relay, the power switch, and the terminal block are disposed on the bottom plate of the protective cover and inside the protective cover housing. An opening is provided at a predetermined position on the upper surface of the protective cover housing, and the predetermined position corresponds to the position of the second non-penetrating hole provided on the second heating element.

9. The rod-type temperature sensor test and calibration instrument according to claim 8, characterized in that, The rod-type temperature sensor test and calibration instrument also includes: A grounding wire is connected to the protective cover housing; an insulating plate is provided on the bottom plate of the protective cover.

10. The rod-type temperature sensor test and calibration instrument according to claim 8, characterized in that, The rod-type temperature sensor test and calibration instrument also includes: The heating device is fixed to the base plate of the protective cover by a fixed bracket.

11. The rod-type temperature sensor test and calibration instrument according to claim 10, characterized in that, A PTFE gasket is provided between the fixed bracket and the base plate of the protective cover.

12. The rod-type temperature sensor test and calibration instrument according to claim 5, characterized in that, The rod-type temperature sensor tester also includes a first indicator light, a second indicator light, and a third indicator light, wherein the first indicator light is used to indicate whether the main power supply is turned on; The second indicator light is used to indicate that the heating device is in heating mode; The third indicator light is used to indicate that the heating device is in a non-heating state.

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