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Rosemount 644 Temperature Transmitter

Temperature Transmitter

Rosemount 644 Temperature Transmitter


  • User-selectable inputs
  • 4-20 mA HART or FOUNDATION fieldbus output
  • Optional five-digit integral LCD display
  • Input/output isolation tested to 500 V ac rms; 707 V dc @50/60 Hz
  • Head mount or rail mount

Temperature Transmitter

Rosemount 644 Temperature Transmitter

The Rosemount 644  is designed for

use in control applications where the loss of the

temperature points may be detrimental.

These highly accurate Rosemount 644

are available in a variety of mounting styles, field

housings, and communication protocols to meet your demanding

installation requirements.

Each Rosemount 644 is a 2-wire

design providing either a 4-20 mA/HART or a completely

digital FOUNDATION fieldbus ouput.

Each unit can be configured for a variety of sensor inputs:

RTD, themocouple, millivolt, or ohm.

The advanced Rosemount 644  powers

PlantWeb ® by communicating important temperature

diagnostics and PlantWeb alerts to ensure process health and

enable economical single-sensor architecture.

Entering the temperature-resistance profile specific to the

RTD sensor into the Rosemount 644

results in transmitter-sensor matching.

This eliminates the sensor interchangeability error, which

can improve accuracy by up to 75%.

The integral LCD display provides local indication of

temperature measurement and diagnostics for immediate and

accurate verification or process conditions.

Meeting the NAMUR NE 21 recommendations, the Rosemount 644

ensures top transmitter performance

in harsh EMC environments.

In addition, the Rosemount 644 HART transmitter meets NAMUR

NE 43 and NE 89 recommendations.

The Rosemount 644 offers great

mounting flexibility.

The DIN A style head mount transmitters fits a variety of

housings for remote transmitter mounting and can be integral

or remote mounted to a sensor.

The compact rail mount style is great for DIN rail mounting

in the tight spaces of a crowded control room.