Using This Manual; Transmitter; Considerations; General - Emerson Rosemount 644 FOUNDATION Reference Manual

Reference Manual
00809-0400-4728, Rev CA
Section 1
1.1

Using this manual

The sections in this manual provide information on installing, operating, and maintaining the
Rosemount
Section 2: Configuration
Information on software functions, configuration parameters, and online variables is also included.
Section 3: Installation
options.
Appendix A: Specifications and Reference Data
ordering information and contains intrinsic safety approval information, European ATEX directive
information, and approval drawings.
Appendix B: Foundation
1.1.1

Transmitter

Features of the Rosemount 644 include:
Accepts inputs from a wide variety of sensors

Configuration using F

Electronics that are completely encapsulated in epoxy and enclosed in a metal housing, making the

transmitter extremely durable and ensuring long-term reliability
A compact size and two housing options allowing mounting flexibility for the control room or the field

Refer to the following literature for a full range of compatible connection heads, sensors, and
thermowells provided by Emerson.
Temperature Sensors and Assemblies

Temperature Sensors and Assemblies

1.2

Considerations

1.2.1

General

Electrical temperature sensors such as RTDs and thermocouples produce low-level signals proportional
to their sensed temperature. The Rosemount 644 converts the low-level sensor signal to a standard
4–20 mA dc, or digital F
electrical noise. This signal is then transmitted to the control room via two wires.
1.2.2

Commissioning

The transmitter can be commissioned before or after installation. It may be useful to commission it on
the bench, before installation, to ensure proper operation and to become familiar with its functionality.
Make sure the instruments in the loop are installed in accordance with intrinsically safe, FISCO, or
non-incendive field wiring practices.
Introduction
Introduction
™
644 Pressure Transmitter. The sections are organized as follows:
provides instruction on commissioning and operating transmitters.
contains mechanical and electrical installation instructions, and field upgrade
™
Fieldbus Block Information
Fieldbus Protocol
OUNDATION
Fieldbus signal that is relatively insensitive to lead length and
OUNDATION
supplies reference and specification data, as well as
provides information regarding the function blocks
Product Data Sheet, Volume 1
Product Data Sheet, Volume 2
Introduction
September 2018
1