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ZN-WZJ-T type thermocouple and thermal resistance automatic calibration device
The ZN-WZJ-T thermal automatic calibration system is one of the latest fourth generation thermal automatic calibration products developed by our compa
Product details
The ZN-WZJ-T thermal automatic calibration system is one of the latest fourth generation thermal automatic calibration products developed by our company. It is a new generation product developed entirely in the Windows environment using the language of the Windows environment. The system is centered around a high-end microcomputer, equipped with a high-precision imported digital multimeter, as well as a measurement and control system consisting of a low potential scanning switch, power regulator, and other components. The operator can easily operate the entire process with a mouse under the Chinese Win95/Win98/WinMe operating system, and the microcomputer system displays the temperature control curve, temperature, and calibration time parameters of the calibration furnace (or oil tank, etc.) in real time. The system fully processes data in accordance with the national metrological verification regulations, and can print various record forms and verification certificates. It can also retain original records for future reference. The system has fully automated the calibration process of thermocouples and thermal resistors, including automatic temperature control, automatic calibration, automatic data processing, and automatic printing of calibration results. Greatly reducing the labor intensity of operators and improving the quality of calibration work. This device also provides authentication programs and data file management programs for the system, providing convenience for operators to archive, retrieve, and query the authentication and verification results of the system.
TECHNICAL INDEX
| Scanning switch parasitic potential | ≤0.4 u V |
| Resolution | Maximum potential measurement resolution of 0.1 uV |
| The highest resistance measurement resolution is 0.1m Ω | |
| accuracy | Uncertainty of potential measurement ≤ 0.01% |
| Resistance measurement uncertainty ≤ 0.01% | |
| Thermocouple calibration uncertainty ≤ 1.2 ℃ | |
| (including annual variation of 0.7 ℃ for second-class standard thermocouples) | |
| The uncertainty of thermal resistance calibration is ≤ 0.05 ℃ | |
| Stability of constant temperature | During the thermocouple calibration process, the furnace temperature change after constant temperature is ≤ 0.2 ℃/min |
| The temperature change of the oil tank after constant temperature during the thermal resistance calibration process is ≤ 0.04 ℃/min | |
| Cold end automatic compensation | When the cold end temperature is within the range of (20 ± 10) ℃, the compensation error is ≤ 0.2 ℃ |
| Verification temperature | Thermocouple 300-1100 ℃ |
| Thermal resistance 0-300 ℃ (including low-temperature thermocouples) | |
| Verification quantity | Thermocouples can simultaneously calibrate 1-5 units |
| Thermal resistors can be tested simultaneously for 1-5 units, and multiple batches of testing are allowed at the same temperature point | |
| One continuous calibration point | 4 thermocouples |
| 3 thermal resistors | |
| Verification time | Thermocouple calibration, under normal conditions, takes an average of about 30 minutes per hundred degrees |
| work environment | Environmental temperature 20 ℃± 3 ℃ |
| Relative humidity ≤ 75% | |
| Use power supply | AC220V±10% 50±1HZ |
| Require grounding resistance ≤ 4 Ω |
Hardware configuration of the system
The ZN-WZJ-T thermal automatic calibration system consists of a high-precision digital multimeter, a main control box, a thyristor regulator, a microcomputer system, a constant temperature device (calibration furnace and oil tank), as well as measurement and communication wires, as shown in the figure.
Configuration List of ZN-WZJ-T Thermal Instrument Automatic Calibration System
| micro-computer system | name | unit | quantity | notes |
| host | cover | 1 | Configure P4 2.0 or above 256M 60G, optical floppy drive, control board (already assembled) | |
| monitor | tower | 1 | 17 inch flat screen | |
| laser printer | tower | 1 | EPSON or CANON series | |
| computer table | fix | 1 | ||
| Communication cable | root | 1 | ||
| Multi purpose power socket | only | 2 | ||
| Data acquisition system | Main control box | tower | 1 | |
| Measurement control cable | cover | 1 | ||
| Multimeter (imported) | root | 1 | KEITHLEY 6 1/2 digits (imported) | |
| temperature sensor | branch | 1 | Cold end compensation | |
| temperature control system | Thyristor regulator | tower | 1 | |
| Control signal line | root | 1 | ||
| power line | root | 1 | ||
| Other accessories | Tubular verification furnace | tower | 1 | |
| standard oil tank | tower | 1 | ||
| Standard sink | tower | 1 | ||
| Freezing point apparatus | tower | 1 | ||
| Ice maker | tower | 1 | ||
| Second class standard thermistor | branch | 1 | ||
| Second class standard thermocouple | branch | 1 | ||
| Second class standard off duty tube thermometer | cover | 1 | ||
| Software documentation | cover | 1 | Software CD, certificate of conformity, instruction manual |
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