Chapter 1 Introduction; Using This Manual; Transmitter Overview - Emerson Rosemount 644 Reference Manual

Reference Manual
00809-0500-4728
1 Introduction
1.1

Using this manual

This manual is designed to assist in the installation, operation, and maintenance of
Rosemount 644R/T Rail Mount Temperature Transmitter.
• Installation
• Configuration
• Operation and maintenance
• Troubleshooting
• Reference data
1.2

Transmitter overview

The transmitter supports the following features:
• 4-20 mA/HART
• Accepts either one or two inputs from a wide variety of sensor types (2-, 3-, and 4-wire
RTD, thermocouple, mV and ohm)
• Optional Safety Certification (IEC 61508 SIL 2)
• Special dual-sensor features including Hot Backup
differential and average temperature measurements, and four simultaneous
measurement variable outputs in addition to the analog output signal
• Meets NAMUR NE21, NE43, NE44, NE89 and NE107 compliant diagnostics information.
Refer to the following literature for a full range of compatible connection heads, sensors,
and thermowells provided by Emerson:
• Rosemount 214C Temperature Sensors
• Rosemount Volume 1 Temperature Sensors and Accessories (English)
Sheet
• Rosemount DIN-Style Temperature Sensors and Thermowells (Metric)
Sheet
Table 1-1: Change Summary: Rosemount 644 Rail Mount HART Device Revision
Release date
May 2021
(1) NAMUR software revision is located on the hardware tag of the device. HART software revision
can be read using a HART communication tool.
Emerson.com/Rosemount
®
protocol (Revision 7)
NAMUR NAMUR
software hardware
revision revision
01.05.10 01.05.10
™
, Sensor Drift Alert, first good,
Product Data Sheet
HART software Manual document
(1)
revision number
7 00809-0500-4728
Introduction
December 2021
Product Data
Product Data
5