1
Introduction
1.1
Overview
The Rosemount 975MR Multi-spectrum Flame Detector uses improved multi-spectrum
infrared technology to provide state-of-the-art fire protection. The detector uses patented
digital signal processing to analyze the spectral and dynamic characteristics of the
measured infrared radiation to identify fire events with exceptional sensitivity and extreme
immunity to fire alarms.
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
®
communication or HART
®
communication (in models
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.
1.2
Model and types
The Rosemount 975MR is provided in various configurations depending on:
•
Output configurations
•
Temperature
•
Housing style
Reference Manual
Introduction
00809-0100-4975
August 2019
Rosemount 975MR
7
