Engineered for versatility, the 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.
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
Features
. 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
