Automatic Verification System for Thermocouple Thermal Resistance

DY-01 thermocouple/thermal resistance automatic verification system is a computer as the core, with imported high-precision six-half digital multimeter, and low potential scanning switch, main control box composed of measurement and control system. The operator can easily operate the whole process with the mouse under the Chinese Windows XP/ WIN7 operating system. The microcomputer system displays the temperature control curve, temperature value and verification time of the verification furnace (or oil tank, cryogenic tank, etc.) in real time. The system processes data in full accordance with the current national metrological verification regulations, and can print all kinds of record forms, verification certificates, and retain the original records for future reference. The system fully realizes the whole automation of thermocouple and thermal resistance verification process, namely: automatic temperature control, automatic verification, automatic data processing, automatic printing of verification results. The labor intensity of the operator is greatly reduced, and the working quality of the verification is improved. The device also provides the certification program of the system and the data file management program, which provides convenience for the operator to archive, retrieve and query the certification and verification results of the system.

【 Technical index 】

Scanning switch parasitic potential

0.2 u V or less

accuracy

The uncertainty of potential measurement is less than 0.01%

Resistance measurement uncertainty

≤ 0.01%

Uncertainty of thermocouple verification

1.2 ℃ or less

Uncertainty of thermal resistance verification

0.05 ℃ or less

Potential measurement error

Plus or minus 0.005% or less

Resistance measurement error

Plus or minus 0.01% or less

Resolving power

Electric potential: 0.01μV; Resistance: 0.01mΩ

Temperature control accuracy

The temperature deviation from the test point of the thermocouple should not exceed ±5℃

Constant temperature stability

After thermocouple verification process constant temperature, furnace temperature change rate ≤0.2℃/min; After constant temperature in the thermal resistance verification process, the temperature change of the constant temperature tank is less than 0.04℃/10min

Certified temperature point

Any temperature point in the range of (-80 ~ 1200) ℃

Verification duration

Under normal conditions, the average inspection point is about 20 minutes

Verification object

K, E, J, N, B, S, R, T, various types of working thermocouples, Pt100, Pt10, Cu50, Cu100 and other types of thermal resistance for two wire, three wire and four wire system automatic verification; Digital temperature indicator regulator, industrial process measurement recorder, etc.