644 Temperature Transmitter

644 Temperature Transmitter
Product Details

Rosemount 644 Temperature Transmitter with Hart 

The wall-mounted 644 temperature transmitter can be connected to a thermal resistor or thermocouple. The LCD shows the current temperature change. 24V DC power supply 4-20MA signal output two-wire system superimposed HART communication protocol.

Transmitter features include:

• Transmitter-sensor comparison function to improve measurement accuracy of the entire system

• Temperature correction circuit to reduce ambient temperature effects

• Independent alarm circuit to detect electronic board and sensor failure

• Performance indicators of at least 3σ

• Accuracy: ±0.15°C (±0.27oF), Pt100 thermal resistance

• Stability: ±0.1% reading or ±0.1°C, whichever is greater, 12 months, RTD and thermocouple input

• Unlimited range settings within the sensor range

• Optional WAGO spring clip terminals provide anti-vibration connection for applications where no tightening is required


• Compatibility with Rosemount HART375 Communicator, Rosemount HART475 Communicator HART-based system, and PC-based AMS device management system

• Improve process efficiency, quality and productivity

Specification :

Transmitter Type


H :DIN A Head Mount (suitable for mounting in the field with enclosure options below) 

R :Rail Mount

Output :

4–20 mA with digital signal based on HART protocol



M5 : LCD Display 

M6 :LCD Display with Polycarbonate Meter Face

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