Features And Benefits; Principles Of Operation - Emerson Rosemount 975UF Reference Manual

Reference Manual
00809-0100-4977
NOTICE
Check your specific part numbers against the information in
1.3

Features and benefits

The flame detector has the following features and benefits.
• UV/IR dual sensor.
• High speed response: twenty milliseconds response to flash fire
• Built-in test (BIT): automatic (see
• Heated window: prevents effects of icing, snow, and condensation.
• Electrical interface:
—
—
—
• HART
• Exde: integral junction box for easy wiring.
• SIL-2: TÜV approved.
• Hazardous area certification: ATEX, IECEx, and FM
• Functionality approval:
—
—
• Accessories are approved as part of ATEX and IECEx approval.
1.4

Principles of operation

1.4.1 Detection principles
The Rosemount Rosemount 975UF flame detector is an electronic device designed to
sense the occurrence of fire and flames and subsequently activate an alarm or an
extinguishing system directly or through a control circuit.
The UV/IR radiation flame detector is a dual spectrum optical detector sensitive to two
separate ranges of the radiation spectrum, both of which are present in fires. The detector
monitors the protected volume by measuring the radiation intensity in it within two
frequencies of the electromagnetic spectrum, namely the ultraviolet (UV) and the infrared
(IR).
The detector integrates two dependent channels in which appropriate detection pulses
are registered and further analyzed for frequency, intensity, and duration.
Rosemount 975UF
Dry contact relays
Communication network RS-485
0-20 mA output
®
protocol: communication protocol (see
EN54-10 approved by VdS
FM approved per FM3260
Checking the product
Built-in test (BIT))
®
HART protocol).
Introduction
June 2021
type.
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