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Rosemount 644 Temperature Transmitter

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  • User-selectable inputs
  • 4-20 mA HART or FOUNDATION fieldbus output
  • Optional five-digit integral LCD display
  • Input/output isolation tested to 500VAC rms
    • 707VDC @50/60Hz
  • Head mount or rail mount
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Rosemount 644 Temperature Transmitter Introduction

Rosemount 644 Temperature Transmitter is available with HART®, FOUNDATION™ Fieldbus or PROFIBUS® protocols in head, field or rail mount styles and a variety of enclosure options. By adding a Local Operator Interface (LOI), you can update your transmitter configuration in the field without tools. For diverse application requirements, this transmitter includes diagnostic capabilities, such as Hot Backup™ capability, sensor drift alert and thermocouple degradation.

Rosemount 644 temperature transmitter is designed for use in control applications where the loss of the temperature points may be detrimental. These highly accurate Rosemount 644 temperature transmitters are available in a variety of mounting styles, field housings, and communication protocols to meet your demanding installation requirements.

Rosemount 644 Temperature Transmitter Feature


  • Extremely versatile temperature transmitter available in HART®, FOUNDATION™ Fieldbus or PROFIBUS® protocols

  • Diverse mounting configurations including head, field or rail mount with many enclosure options

  • LOI option eliminates the need for special configuration tools (i.e. field communicator) for ease-of-use

  • Transmitter-sensor matching with Callendar-Van Dusen constants reduces total measurement error

  • Hot Backup™ capability and sensor drift alert with dual sensors ensure measurement integrity

  • Thermocouple degradation diagnostic monitors thermocouple health to detect degradation before failure

  • Minimum and maximum temperature tracking observes temperature extremes for easy troubleshooting

  • Device dashboards provide easy interface for simplified device configuration and diagnostic troubleshooting

Rosemount 644 Temperature Transmitter Specification 


    • Input

      Dual and single sensor capability with universal sensor inputs (RTD, T/C, mV, ohms)

    • Output Signal

      4-20 mA /HART® protocol, FOUNDATION™ fieldbus protocol, PROFIBUS® PA protocol

    • Housing

      Field mount, DIN A head mount or rail mount

    • Display/Interface

      LCD Display or LCD Display with Local Operator Interface (LOI)

    • Diagnostics

      Basic diagnostics, Hot Backup™ capability, sensor drift alert, thermocouple degradation, min/max tracking

    • Calibration Options

      Transmitter-sensor matching (Callendar-Van Dusen constants), 5-point calibration

    • Certifications/Approvals

      SIL 2/3 certified to IEC 61508 by an independent 3rd party, hazardous location, marine type, see full specs for complete list of certifications

-Manuals

Rosemount 644 Temperature Transmitter

-Data sheet


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