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
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
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.