Rosemount 644 Temperature Transmitter

The superior precision of the Rosemount 644 makes this transmitter ideal for use in control applications where the loss of temperature points can be detrimental. For immediate and accurate verification or process condition updates, its prime LCD display features local indication of temperature measurement and diagnostics.

By entering the temperature-resistance profile specific to the RTD sensor into the Rosemount 644, transmitter-sensor matching is achieved, eliminating the sensor interchangeability error. This is capable of improving accuracy by up to 75%.

The 644’s 2-wire design features either a 4-20 mA/HART or a fully digital FOUNDATION Fieldbus output. It can be configured for a wide range of sensor inputs including:

  • RTD
  • thermocouple
  • millivolt
  • ohm

To ensure process health and enable economical single-sensor architecture, the advanced Rosemount 644 Temperature Transmitter powers PlantWeb ®. Its capabilities include communication of important temperature diagnostics and PlantWeb ® alerts.

Crowded control rooms are no deterrent to the Rosemount 644’s compact rail mount style, which provides the option of DIN rail mounting in tight spaces. This highly adaptable DIN A-style head mount transmitter can be integral or remote mounted to a sensor and fits a variety of housings for remote transmitter mounting. It is also available in various additional mounting styles, field housings and communication protocols to match the specifications of your installation.

The Rosemount 644 Temperature Transmitter ensures top-tier performance in harsh EMC environments and meets NAMUR NE 21 recommendations. Additionally, the Rosemount 644 HART Transmitter meets NAMUR NE 43 and NE 89 recommendations.

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Rosemount 644 Temperature Transmitter Spec Sheet