Thermal instrument calibration device

The thermal instrument calibration device is developed by our factory with the support of scientific research institutions and many customers, through the absorption and improvement of advanced technologies for similar products. It is currently one of the more advanced automatic calibration devices in China.

Overview

The LT-RZJ-T thermal instrument calibration device is developed by our factory with the support of scientific research institutions and many customers, through the absorption and improvement of advanced technology from similar products. It is currently one of the more advanced automatic calibration devices in China. The device is mainly composed of a 32-bit microcomputer, which is equipped with a 6 1/2 bit imported high-precision digital multimeter, a low potential multi-channel scanner, a high stability digital controller, a dedicated input/output interface card, a printer, and advanced and fully functional dedicated software configuration. Realize fully automatic calibration of thermocouples and thermal resistors for various work applications.

　　feature：

◆High degree of automationThe entire verification process is automatically completed by the device under the control of a computer, except for the need for the verifier to bundle thermocouples, thermistors, load furnaces (slots), and wire connections (automatic temperature control, automatic detection, automatic calculation, automatic printing of detection results, automatic storage of detection data, etc.).

◆ Advanced hardware technology, adopting fully digital technology, modular structure composed of universal digital integrated circuits, and equipped with relatively complete manual/automatic switching functions. The main operations such as furnace temperature control, channel switching, and data acquisition can be carried out automatically or manually.

◆ Software technology, adopting full screen multi screen display technology, all using menu based selection and human-machine dialogue for operation, supporting mouse. In the Windows 2000 environment, the program is developed using a mixture of CODEBASE VISUAL C++, VISUAL FOXPRO, and assembly language, which has fast running speed, novel interface, secure data management, and flexible user participation.

◆High degree of standardizationThe calibration points, calibration records, and calibration results can be set according to the requirements of regulations and standards, as well as according to the actual needs of users and metrological management requirements.

◆High precision furnace temperature controlShort calibration time, using optimized furnace temperature control algorithm and self calibration technology, this device has fast heating speed, short temperature control time, and long constant temperature time. Generally, with three calibration points, the calibration work can be completed in about two hours (including issuing calibration result reports).

◆High detection accuracy and complete functionsData is collected using an imported high-precision digital multimeter with a resolution of 0.1uV 6 1/2 bits, and data judgment and processing are performed using artificial intelligence technology. Automatic storage of calibration data, protection of power failure data, automatic compensation of cold end temperature, over temperature alarm, simultaneous calculation of calibration point thermoelectric potential value, thermoelectric potential error value, temperature error value, and allowable error value. A calibration result table (calibration certificate or calibration result notification) can be provided for each tested component. For platinum rhodium 10 platinum thermocouples, not only fixed point thermoelectric potential value but also whole potential value can be provided. It can dynamically display the actual temperature, temperature change rate, temperature control curve, and graphic enlargement of the constant temperature curve inside the calibration furnace (tank).

◆Set up a complete system self-test programFunction self inspection can be performed on digital multimeters, main control boxes, thyristor voltage regulators, dedicated I/O interface cards, etc. to check whether the above components are working properly, identify faulty components and their causes, and facilitate device maintenance and fault diagnosis and elimination. There is a complete usage and operation help program set up, which can be queried and assisted at any time.

Device design: Reasonable structure, advanced manufacturing technology, complete quality assurance system, modular structure, easy maintenance, replacement, and upgrade. Key components are selected from imported high-quality components, which undergo strict aging screening and inspection before leaving the factory to ensure product quality.

◆Data archiving functionIt can provide convenience for users in data processing and measurement management. If needed, our factory can also provide technical support for data management and processing to users.

　　JK-RZJ-TtypeThermal instrument calibration deviceMain technical indicators:

◆Temperature range for verification

Thermocouple 300 ℃~1100 ℃; Thermal resistance: 0-300 ℃.

◆Verify the types of thermocouples and thermal resistors

Thermocouples for work: S, K, E, J, N, EA2, B, T, (U, L) types;

Thermal resistors for work: Cu50, Cul00, Ptl0, Ptl00, etc.

◆accuracyThe accuracy of voltage measurement is better than 0.02%, with a resolution of 0.1uV.

The accuracy of resistance measurement is better than 0.02%, with a resolution of 0.1m Ω.

The parasitic potential of each measurement channel is ≤ 0.4uV.

Constant temperature equipment has a high heating rate: tube type calibration furnace>30 ℃/min;

Oil tank temperature>2 ℃/min.

◆Temperature control accuracy

The temperature deviation of the tube type calibration furnace from the preset calibration point is ≤± 5 ℃;

The temperature deviation of the oil (water) tank from the preset point is ≤± 1.5 ℃.

Temperature stability inside the furnace (tank) during calibration measurement

Tube type calibration furnace temperature ≤ 0.2 ℃/min, and ≤ 0.5 ℃/10min;

Oil tank temperature ≤ 0.02 ℃/min, and ≤ 0.04 ℃/10min.

◆Automatic compensation for cold end temperatureWhen the cold end temperature is within the range of 20 ± 10 ℃, the compensation error is ≤ 0.2 ℃.

The detection time for each verification point is about 1.5 minutes.

◆The uncertainty of the verification result (including the error of the standard instrument, with a confidence probability of 99.8%)Thermocouple: ≤ 1.2 ℃, repeatability error: ≤ 0.2 ℃ (at 600 ℃).

Thermal resistance: ≤ 0.05 ℃, repeatability error: ≤ 0.012 ℃ (at 100 ℃).

◆Verification quantity

Thermocouples: 6 (including 1 standard thermocouple);

Thermistor: 6 units (including 1 standard platinum resistor).

The processing of detection data shall be carried out in accordance with the current national metrological verification regulations and specifications.

◆Anti-interference performance

Serial mode ≥ 46db; common mode ≥ 100db.

◆working environment

Temperature range: 0-40 ℃. When the room temperature exceeds (20 ± 5) ℃, temperature correction should be performed. Relative humidity>70%.

◆working power supply220V ± 10 Ω, 50Hz. It also has a good grounding wire (grounding resistance<5 Ω).

◆power consumptionTube type verification furnace: 2KW; oil (water) tank: 4KW;

Detection system: 500W (including microcomputer system).

◆Other supporting equipment

The indicators for the calibration furnace and oil (water) tank are specified in JJG351-96 and JJG229-98. For thermocouples shorter than 400mm, a shorter calibration furnace should be selected.