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Emerson Rosemount 644 Temperature Transmitter

Emerson Rosemount 644 Temperature Transmitter
Emerson Rosemount 644 Temperature Transmitter Product Introduction The 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...
Product Details:

Emerson Rosemount 644 Temperature Transmitter


Product  Introduction


The 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.

 

Each Rosemount 644 temperature transmitter 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 temperature

transmitter 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

temperature transmitter 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 temperature transmitter

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 temperature transmitter 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.

 


Quick Detail


 

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Brand

Rosemount

Model

644

Output

4~20mA Hart,Profibus,FF

Input

Thermal resistance: PT100  0~150°C

Accuracy

Thermal resistance: ±0.2%FS

Cold junction compensation

0~50°C±1°C

Temperature drift

±0.2%/°C

Adjustment method

Potentiometer

Power

24VDC±10%

Ambient Temperature

-20~80°C

Load capacity

0~500Ω

Ambient Humidity

<85%RH

 

Accuracy

±0.10°C (±0.18°F)

Stability

5-year stability

Warranty

12/18 months, 3-year or 5-year limited warranty options

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

 


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