I. Overview The thermocouple vacuum meter is a new type of vacuum measuring instrument that uses computer technology to nonlinearly process vacuum measurement data. It improves the measurement accuracy and increases the stability of the display. It is an advanced vacuum gauge. Widely used in aerospace, machinery, petroleum, chemical, Low temperature liquid storage and transportation equipment, metallurgy, electronics and medical fields. The product complies with JB/T6873-2005. 2. Working principle According to the heat transfer characteristics of gas molecules under low pressure, when the heating current of the thermocouple gauge hot wire is constant, the temperature of the hot wire will follow the pressure inside the tube. Strong and change, when the pressure is reduced, the heat conduction motion of the gas molecules is weakened, and the temperature of the hot wire is increased; otherwise, the temperature of the hot wire is reduced, heat The thermoelectric potential of the even tube output reflects the change in the temperature of the hot wire. As long as the thermoelectric potential of the gauge is measured, the corresponding system pressure is determined. The thermoelectric potential of the regulated output is sent to the digital tube after being nonlinearly processed by the computer. 3. Thermocouple regulation *. Technical specifications of ZJ-51 (M007) type thermocouple tube 1. Range: 66.5Pa ~ 0.1 Pa 2. Vacuum error: ± 15 % 3. Heating current: 90 ~ 130 mA *. Technical specifications of ZJ-54 (ZJ-53) type thermocouple tube 1. Range: 300Pa ~ 0.1 Pa 2. Vacuum error: ± 15 % 3. Heating current: 27.5 ± 1.5 mA IV. Technical specifications of the instrument 1. Measuring range: 500Pa ~ 0.1Pa (0 ~ 100 grid) 2. Heating current range: 20 mA to 130 mA Effective error range: 68Pa ~ 0.1Pa (ZJ-51) 300Pa~0.1 Pa(ZJ-54) 3. Heating current error: ± 0.5 % 4. Vacuum limit error: ± 20 % 5. Display digits: four digit LCD 6. Working power supply: DC 8V lithium battery, AC 220/50Hz 7. Power: 2 VA; 8. Weight: 0.3 kg 9. Dimensions: 152 × 83 × 30 mm3
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