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Emerson Rosemount 644 with HART Protocol User Manual

Emerson Rosemount 644 with HART Protocol
112 pages
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Reference Manual
00809-0200-4728, Rev SA
July 2018
Rosemount
644 Temperature Transmitter
with HART
®
Protocol

Table of Contents

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Emerson Rosemount 644 with HART Protocol Specifications

General IconGeneral
TypeTemperature Transmitter
MeasurementTemperature
Output Signal4-20 mA with HART Protocol
AccuracyUp to ±0.1% of span
Communication ProtocolHART
EnclosureAluminum or stainless steel
InputSingle or dual sensor input
Process Temperature RangeDepends on sensor type
Power Supply10.5 to 42.4 VDC
Enclosure RatingType 4X, IP66
DisplayOptional LCD display
Sensor TypeRTD, Thermocouple
MountingHead-mount, rail-mount
Temperature Range-40°C to 85°C (-40°F to 185°F)

Summary

Section 2: Configuration

2.6 Basic Transmitter Configuration

Covers essential variables for transmitter operation, including mapping HART variables and sensor setup.

Section 3: Hardware Installation

3.4 Installation Procedures

Provides a flowchart and steps for mounting, wiring, and powering the transmitter.

3.4.3 Installing the Device

Step-by-step instructions for head mount transmitter installation with DIN plate or threaded sensor.

Section 4: Electrical Installation

4.3 Wiring and Powering the Transmitter

Explains how power is supplied via signal wiring and how to connect wiring for the transmitter.

4.3.1 Sensor Connections

Details compatibility with RTD and thermocouple sensors and proper connection methods.

Section 5: Operation and Maintenance

5.4 Sensor Input Trim

Allows alteration of the transmitter's input interpretation for site-standard calibration using known temperature sources.

5.5 Analog Output Trim

Covers trimming the transmitter's analog output to match standards, including 4-20mA and scaled outputs.

5.6 Transmitter-Sensor Matching

Enhances accuracy by creating a custom curve matching specific sensor performance via Callendar-Van Dusen constants.

Section 7: Safety Instrumented Systems (SIS) Certification

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