Thermocouple temperature transmitter, thermal resistance as temperature measurement devices, temperature measurement element to the output signal from the transmitter module, the regulated filter, operational amplifier, nonlinear correction, V / I converter, constant current and reverse After the protection circuit process, is converted into a linear relationship with the temperature of 4 ~ 20mA current signal output. The main features of ultra-small (module φ44 × 18) integrated, versatile two-wire 4 ~ 20mA DC output. Transmission distance, anti-interference ability. Cold end, temperature drift and non-linear automatic compensation. High accuracy, good long-term stability. The temperature inside the module using epoxy resin casting process, adapted to the harsh and dangerous places. Integrated design, simple and reasonable structure, can directly replace general assembly thermocouple, RTD. Mechanical protection IP65. Thermocouple temperature change, can avoid compensating cables, reducing costs on-site ambient temperature> 70 ℃, the transmitters and field display instrument can be separated (isolated) installation of protection: IP54 applications in petroleum, chemical, chemical fiber; textiles , rubber, building materials; electricity, metallurgy, pharmaceutical and other industries. Temperature Transmitter calibration Note 1, pay attention to the wiring polarity, and energized warmed up for 15 minutes after the start tuning. 2, adjust to the slow speed of the input signal, in order to ensure no overshoot. 3, when adjusting potentiometer do not overexert, to prevent bad twist. 4, before adjustment, to be ready to check record list, and check the temperature of each thermocouple data checkpoint / millivolt table or RTD temperature / resistance table, you will need to identify and fill has been prepared Good data records in the table.