1. HART, FF or Profibus Protocol support. 2. SIL 2 certified to IEC 61508. 3. LCD Display.

The Rosemount 644 is a versatile temperature transmitter that delivers field reliability and advanced accuracy and stability to meet demanding process needs, especially with following characters:

HART/4-20 mA with Selectable Revision 5 and 7 selectable, FOUNDATION field bus or PROFIBUS PA.DIN A Head mount or Rail Mount transmitter styles.Dual Sensor Input.SIS SIL 2 Safety Certification to IEC 61508.LCD Display.Local Operator Interface.Advanced Diagnostics.Enhanced Transmitter Accuracy and Stability.Transmitter-Sensor Matching.Isolation: Input/output isolation tested to 600 Vrms.Stability: ±0.15% for 2 years.Physical specification:Conduit Connections: Captivated screw terminals permanently fixed to terminal block for 644 Head hart, Compression screw terminals permanently fixed to the terminal block for 644 head FF and Profibus and Compression screw permanently fixed to front panel to 644 Rail HART.Materials of Construction: Electronics Housing is Low-copper aluminum and 613SST , Paint is Polyurethane.Cover O-rings: Buna-N.Terminal Block and Power Module: PBT.Antenna: PBT/Polycarbonate (PC) integrated omnidirectional antenna.Mounting: 644 Rail attaches directly to a wall or a DIN rail, 644 Head installs in a connection head or universal head mounted directly on a sensor assemblyEnclosure Ratings: IP66 and IP68.

Rosemount 644 Integral Temperature Transmitter