Chapter 1 Introduction; Overview - Emerson Rosemount 975UF Reference Manual

Reference Manual
00809-0100-4977
1 Introduction
1.1

Overview

The Rosemount Rosemount 975UF ultra fast Ultraviolet Infrared Flame Detector senses
radiant energy in the shortwave section of both the ultraviolet and infrared portions of the
electromagnetic spectrum. The IR sensor operates at a wavelength of 2.5 to 3.0 µm, giving
the flame detector the ability to detect hydrocarbon-based fuel and gas, hydroxyl, and
hydrogen fires, as well as metal and inorganic fires. The detector has a high-speed
response, 20 milliseconds, to flash fires or explosions.
All Rosemount 975 series detectors include a heated optical window for improved
performance in icing, snow, and condensation conditions.
The operator can easily adapt detection performance to all environments, applications,
and requirements by changing the detector's configuration parameters. Adjusting these
parameters, as well as performing other maintenance and monitoring tasks, is possible by
means of RS-485 based Modbus
with 0-20 mA output).
The detector enclosure is ATEX certified Exd flameproof with an integral, segregated, rear,
Exe terminal compartment (avoiding exposure of the sensors and electronics to
surrounding environment). Hence the combined approval:
Ex II 2G D
Ex db eb op is IIC T4 G
Ex tb op is IIIC T96 °C Db
(-55 °C ≤ Ta ≤ +75 °C)
or
Ex II 2G D
Ex db eb op is IIC T4 Gb
Ex tb op is IIIC T106 °C Db
(-55 °C ≤ Ta ≤ +85 °C)
The flame detector is designed to operate as a stand-alone unit directly connected to an
alarm system or an automatic fire extinguishing system. The detector can also be part of a
more complex system where many detectors and other devices are integrated through a
common control unit.
Rosemount 975UF
®
communication or HART
Introduction
June 2021
®
communication (in models
7