Rosemount Analytical 975UF Operating Manual

Rosemount™ 975UF

Ultra Fast Ultraviolet Infrared Flame Detector

Reference Manual

00809-0100-4977, Rev E

April 2018

Legal Notice

The flame detector described in this document is the property of Rosemount.

No part of the hardware, software, or documentation may be reproduced, transmitted, transcribed, stored in a retrieval system, or
translated into any language or computer language, in any form or by any means, without prior written permission of Rosemount.

While great efforts have been made to ensure the accuracy and clarity of this document, Rosemount assumes no liability resulting
from any omissions in this document or from misuse of the information obtained herein. The information in this document has been
carefully checked and is believed to be entirely reliable with all of the necessary information included. Rosemount reserves the right
to make changes to any products described herein to improve reliability, function, or design and reserves the right to revise this
document and make changes from time to time in content hereof with no obligation to notify any persons of revisions or changes.
Rosemount does not assume any liability arising out of the application or any use of any product or circuit described herein; neither
does it convey license under its patent rights or the rights of others.

WARNING!

All individuals who have or will have responsibility for using, maintaining, or servicing the product should read this manual carefully.
The detector is not field repairable due to the meticulous alignment and calibration of the sensors and the respective circuits. Do not
attempt to modify or repair the internal circuits or change their settings, as this will impair the system's performance and void the
Rosemount product warranty.

Warranty

1. Limited Warranty . Subject to the limitations contained in Section 2 (Limitation of Remedy and Liability) herein, Seller
warrants that (a) the licensed firmware embodied in the Goods will execute the programming instructions provided by
Seller; (b) that the Goods manufactured by Seller will be free from defects in materials or workmanship under normal use
and care; and (c) Services will be performed by trained personnel using proper equipment and instrumentation for the
particular Service provided. The foregoing warranties will apply until the expiration of the applicable warranty period.
Sensors and detectors are warranted against defective parts and workmanship for 24 months from the date of purchase and
other electronic assemblies for 36 months from the date of purchase. Products purchased by Seller from a third party for
resale to Buyer (Resale Products) shall carry only the warranty extended by the original manufacturer. Buyer agrees that
Seller has no liability for Resale Products beyond making a reasonable commercial effort to arrange for procurement and
shipping of the Resale Products. If Buyer discovers any warranty defects and notifies Seller thereof in writing during the
applicable warranty period, Seller shall, at its option, (i) correct any errors that are found by Seller in the firmware or
Services; (ii) repair or replace FOB point of manufacture that portion of the Goods found by Seller to be defective; or (iii)
refund the purchase price of the defective portion of the Goods/Services. All replacements or repairs necessitated by
inadequate maintenance; normal wear and usage; unsuitable power sources or environmental conditions; accident; misuse;
improper installation; modification; repair; use of unauthorized replacement parts; storage or handling; or any other cause
not the fault of Seller, are not covered by this limited warranty and shall be replaced or repaired at Buyer's sole expense, and
Seller shall not be obligated to pay any costs or charges incurred by Buyer or any other party except as may be agreed upon
in writing in advance by Seller. All costs of dismantling, reinstallation, freight and the time and expenses of Seller's personnel
and representatives for site travel and diagnosis under this limited warranty clause shall be borne by Buyer unless accepted
in writing by Seller. Goods repaired and parts replaced by Seller during the warranty period shall be in warranty for the
remainder of the original warranty period or 90 days, whichever is longer. This limited warranty is the only warranty made by
Seller and can be amended only in a writing signed by an authorized representative of Seller. The limited warranty herein
ceases to be effective if Buyer fails to operate and use the Goods sold hereunder in a safe and reasonable manner and in
accordance with any written instructions from the manufacturers. THE WARRANTIES AND REMEDIES SET FORTH ABOVE ARE
EXCLUSIVE. THERE ARE NO REPRESENTATIONS OR WARRANTIES OF ANY KIND, EXPRESSED OR IMPLIED, AS TO
MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE OR ANY OTHER MATTER WITH RESPECT TO ANY OF THE GOODS
OR SERVICES.

2. Limitation of Remedy and Liability SELLER SHALL NOT BE LIABLE FOR DAMAGES CAUSED BY DELAY IN PERFORMANCE. THE
REMEDIES OF BUYER SET FORTH IN THE AGREEMENT ARE EXCLUSIVE. IN NO EVENT, REGARDLESS OF THE FORM OF THE
CLAIM OR CAUSE OF ACTION (WHETHER BASED IN CONTRACT INFRINGEMENT, NEGLIGENCE, STRICT LIABILITY, OTHER
TORT, OR OTHERWISE), SHALL SELLER'S LIABILITY TO BUYER AND/OR BUYER'S CUSTOMERS EXCEED THE PRICE TO BUYER
OF THE SPECIFIC GOODS MANUFACTURED OR SERVICES PROVIDED BY SELLER GIVING RISE TO THE CLAIM OR CAUSE OF
ACTION. BUYER AGREES THAT IN NO EVENT SHALL SELLER'S LIABILITY TO BUYER AND/OR BUYER'S CUSTOMERS EXTEND TO
INCLUDE INCIDENTAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES. THE TERM "CONSEQUENTIAL DAMAGES" SHALL INCLUDE,
BUT NOT BE LIMITED TO, LOSS OF ANTICIPATED PROFITS, REVENUE OR USE AND COSTS INCURRED INCLUDING WITHOUT
LIMITATION FOR CAPITAL, FUEL AND POWER, AND CLAIMS OF BUYER'S CUSTOMERS.

Technical support

To get technical support for this product, contact your local Rosemount representative or the Rosemount Technical Support
department at [phone] or [e-mail]

Return of material

To expedite the repair and return of this product, proper communication between the
customer and the factory is important.

Before returning a product for repair, call [phone] or email [e-mail] for a return material authorization
(RMA) number.

On the return of equipment, provide the following information:

1. RMA number provided to you by Emerson

2. Company name and contact information

3. Purchase order from your company authorizing repairs of request for quote

Ship all equipment prepaid to:
Emerson Automation Solutions
Rosemount
8200 Market Blvd
Chanhassen, MN 55317
Mark all packages with "Return for Repair" and include the RMA number.

Pack items to protect them from damage and use anti-static bags or aluminum-backed cardboard as protection from electrostatic
damage.

All equipment must be shipped prepaid. Collect shipments will not be accepted.

Release history

Rev Date Revision History

A January 2016 First release

B June 2016 Edited Table 1-3, Table D-1, and Table D-3.

C March 2017 Approvals updates

D March 2018 Approval and flame simulator information update

Abbreviations and acronyms

Abbreviation or acronym Definition

ATEX Atmospheric explosives

AWG American wire gauge

BIT Built-in test

EMC Electromagnetic compatibility

EOL End of line

FOV Field of view

®

HART

Highway addressable remote transducer - communication protocol

IAD Immune at any distance

IECEx International Electrotechnical Commission Explosion

IPA Isopropyl alcohol

IR Infrared

JP5 Jet fuel

Latching Refers to relays remaining in the ON state even after the ON condition has

been removed.

LED Light emitting diode

LPG Liquefied petroleum gas

mA Milliamps (0.001 amps)

®

Modbus

Master-slave messaging structure

N.C. Normally closed

N .O. Normally open

N/A Not applicable

NFPA National Fire Protection Association

NPT National pipe thread

PN Part number

SIL Safety integrity level

UNC Unified coarse thread

Vac Volts alternating current

Vdc Volts direct current

Contents

Contents

Chapter 1 Introduction .................................................................................................................. 1

1.1 Overview ..................................................................................................................................... 1

1.2 Model and types .......................................................................................................................... 1

1.3 Features and benefits .................................................................................................................. 4

1.4 Principles of operation .................................................................................................................5

1.4.1 Detection principles ......................................................................................................5

1.4.2 Heated optics ................................................................................................................6

1.4.3 HART protocol .............................................................................................................. 6

1.4.4 RS-485 Modbus .............................................................................................................7

1.4.5 Product certifications ....................................................................................................7

1.5 Performance considerations ........................................................................................................9

1.5.1 Detection sensitivity ..................................................................................................... 9

1.5.2 Cone of vision ............................................................................................................. 10

1.5.3 False alarms prevention .............................................................................................. 12

1.5.4 Visual indicators ..........................................................................................................13

1.5.5 Output signals ............................................................................................................ 13

1.5.6 Detector status ...........................................................................................................14

1.6 Internal detector tests ............................................................................................................... 16

1.6.1 Continuous feature test .............................................................................................. 16

1.6.2 Built-in test (BIT) ......................................................................................................... 17

Chapter 2 Installing the detector ..................................................................................................19

2.1 General guidelines .....................................................................................................................19

2.2 Unpacking the product ..............................................................................................................20

2.2.1 Checking the product type ..........................................................................................20

2.3 Required tools ........................................................................................................................... 20

2.4 Certification instructions ........................................................................................................... 21

2.5 Install cables ..............................................................................................................................22

2.5.1 Conduit installation .....................................................................................................22

2.6 Install the tilt mount (PN 00975-9000-0001) .............................................................................22

2.6.1 Tilt mount assembly ....................................................................................................23

2.7 Connecting the detector ........................................................................................................... 26

2.7.1 Verify the detector wiring ........................................................................................... 28

2.8 Configuring your detector ......................................................................................................... 29

2.8.1 Alarm delay .................................................................................................................29

2.8.2 Address setup ............................................................................................................. 30

2.8.3 Function setup ............................................................................................................30

2.8.4 Heated optics ............................................................................................................. 30

Chapter 3 Operating the detector ................................................................................................ 31

3.1 Powering up .............................................................................................................................. 31

3.2 Safety precautions .....................................................................................................................31

3.2.1 Default function settings .............................................................................................32

3.3 Testing procedures ....................................................................................................................32

3.3.1 Automatic built-in test ................................................................................................33

3.3.2 Testing with flame simulator - FS-UVIR-975 ................................................................ 33

Chapter 4 Maintenance and troubleshooting ............................................................................... 35

Reference Manual i

Contents

4.1 Maintenance ............................................................................................................................. 35

4.1.1 General procedures .....................................................................................................35

4.1.2 Periodic procedures .................................................................................................... 35

4.1.3 Keeping maintenance records .....................................................................................36

4.2 Troubleshooting ........................................................................................................................37

Appendices and reference

Appendix A Specifications ...............................................................................................................39

A.1 Technical specifications .............................................................................................................39

A.2 Electrical specifications ..............................................................................................................39

A.3 Outputs .....................................................................................................................................40

A.4 Approvals .................................................................................................................................. 42

A.5 Mechanical specifications ..........................................................................................................43

A.6 Environmental specifications .....................................................................................................43

Appendix B Wiring instructions ...................................................................................................... 45

B.1 General instructions for electrical wiring ....................................................................................45

B.1.1 Calculation formula .....................................................................................................46

B.2 Typical wiring configurations .....................................................................................................47

Appendix C RS-485 communication network .................................................................................. 53

C.1 RS-485 overview ........................................................................................................................53

Appendix D Accessories ..................................................................................................................55

D.1 Flame simulator - FS-UVIR-975 .................................................................................................. 55

D.1.1 Ordering information ..................................................................................................56

D.1.2 Unpacking .................................................................................................................. 56

D.1.3 Operating instructions ................................................................................................56

D.1.4 Range ......................................................................................................................... 57

D.1.5 Charging the battery ...................................................................................................58

D.1.6 Battery replacement ................................................................................................... 59

D.1.7 Technical specifications .............................................................................................. 59

D.2 Tilt mount - PN 00975-9000-0001 .............................................................................................60

D.3 Duct mount - PN 00975-9000-0002 .......................................................................................... 61

D.4 Cone viewer - PN 00975-9000-0006 .......................................................................................... 63

D.5 Air shield - PN 00975-9000-0005 ...............................................................................................64

Appendix E SIL-2 features ............................................................................................................... 65

E.1 Rosemount 975UF Ultra Fast Ultraviolet Infrared Flame Detector .............................................. 65

E.1.1 Safety relevant parameters ......................................................................................... 65

E.1.2 Guidelines for configuring, installing, operating, and service. ..................................... 65

ii Rosemount 975UF

1 Introduction

1.1 Overview

The Rosemount 975UF senses radiant energy in the short wave 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 detectors the ability to detect
hydrocarbon-based fuel and gas, hydroxyl, and hydrogen fires, as well as metal and
inorganic fires. The Rosemount 975UF Flame 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.

Detection performance can be easily adapted 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).

Introduction

1.2

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 Gb
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 Rosemount 975 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.

Model and types

The Rosemount 975UF is provided in various configurations depending on:

• Output configurations

• Temperature

Reference Manual 1

Introduction

• Housing style

• Product certifications

The configuration detail is included in the product part number on the product label and
takes the form: 975UF-XXXXXXX, where XXXXXXX defines the model according to the
above requirements.

To modify the default or pre-ordered configuration and perform maintenance tasks,
please refer to the following manuals: HART Protocol 00809-0200-4975, the RS-485 Manual
00809-0300-4975, or 00809-0400-4975.

The standard offering represents the most common options. The starred options (⋆)
should be selected for best delivery. The expanded offering is subject to additional delivery
lead time.

Rosemount 975 Flame Detector Ordering InformationTable 1-1:

Product description

975 975 flame detector ⋆

Technology

MR Multi-spectrum infrared ⋆

HR Multi-spectrum infrared hydrogen ⋆

UF Ultra fast ultraviolet infrared ⋆

UR Ultraviolet infrared ⋆

Output configuration

Outputs Fault relay Alarm relay

1A Analog/HART/

RS-485/relays
(fault, alarm)

2A Analog/HART/

RS-485/relays
(fault, alarm)

3A Analog/HART/

RS-485/relays
(fault,alarm)

1R RS-485/relays

(fault, alarm,
auxiliary)

2R RS-485/relays

(fault, alarm,
auxiliary)

Housing style

Material Conduit entry

(1)

6A

Aluminum 3/4-in. NPT ⋆

Auxiliary re­lay Current type ⋆

Normally
closed

Normally
closed

Normally open Normally open,

Normally
closed

Normally open Normally open Normally open N/A ⋆

Normally open N/A Sink ⋆

Normally open,
normally
closed

normally
closed

Normally open Normally open N/A ⋆

N/A Source ⋆

N/A Source ⋆

2 Rosemount 975UF

Rosemount 975 Flame Detector Ordering Information (continued)Table 1-1:

(1)

8A

6S Stainless steel 3/4-in. NPT ⋆

8S Stainless steel M25 ⋆

Temperature

1 167 °F (75 °C) ⋆

2 185 °F (85 °C) ⋆

Product certifications

A1 ATEX and IECEx flameproof ⋆

A2 FM and CSA flameproof ⋆

E2 INMETRO flameproof ⋆

EM Technical Regulations Customs Union (EAC) flameproof ⋆

Typical model number: 975UF1A6A1A1

(1) Aluminum housing is not available in FM/CSA product certification.

Aluminum M25 ⋆

Introduction

Reference Manual 3

Introduction

Spare Parts and AccessoriesTable 1-2:

Part number Description

00975-9000-0001 Tilt mount ⋆

00975-9000-0002 Duct mount ⋆

00975-9000-0003 Weather cover (plastic) ⋆

00975-9000-0004 Weather cover (stainless steel) ⋆

00975-9000-0005 Air shield ⋆

00975-9000-0006 Cone viewer ⋆

00975-9000-0007 2-in. pipe mount ⋆

00975-9000-0008 3-in. pipe mount ⋆

00975-9000-0009 Flame simulator kit (for 975MR) ⋆

00975-9000-0010 Flame simulator kit (for 975UF and 975UR) ⋆

00975-9000-0011 USB RS-485 harness kit ⋆

00975-9000-0012 Spare battery pack for use with flame simulator ⋆

00975-9000-0013 Flame simulator kit (for 975HR) ⋆

00975-9000-0014 4-in. pipe mount ⋆

00975-9000-0015 Spare battery charger for use with flame simulator ⋆

1.3

NOTICE

Output configuration 1A is default. The mA sink output can be altered to source type, with a link
between terminals 1 and 8. No other output configurations can be changed on site.

For example, product number 975UF3A8S2A1 has the following options:

• Output configuration: 3A (analog/HART/RS-485/relays, fault N.O., alarm N.O./N.C.)

• Housing style: 8S (stainless steel - M25 conduit entry)

• Temperature: 2 (185 °F [85 °C])

• Approvals: A1 (ATEX and IECEx flameproof)

NOTICE

Check your specific part numbers against the information in Section 2.2.1.

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 Section 1.6.2)

4 Rosemount 975UF

• Heated window: prevents effects of icing, snow, and condensation.

• Electrical interface:

- Dry contact relays.

- Communication network RS-485.

- 0-20 mA output.

• HART protocol: communication protocol (see Section 1.4.3).

• Exde: integral junction box for easy wiring.

• SIL-2: TÜV approved.

• Hazardous area certification: ATEX, IECEx, and FM

• Functionality approval:

- EN54-10 approved by VdS.

- FM approved per FM3260.

• Accessories are approved as part of ATEX and IECEx approval.

Introduction

1.4 Principles of operation

1.4.1 Detection principles

The 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.

Sensing elements

The IR sensor in the 975UF is sensitive to radiation over the range of 2.5 to 3.0 microns,
where the H2 emission has a unique spectral peak that enables detection of hydrocarbon
fires, gas fires, hydroxyl, and hydrogen fires, as well as metal and inorganic fires.

The UV sensor is sensitive to radiation over the range of 0.185 to 0.260 µm. The UV
channel incorporates a special logic circuit that eliminates false alarms caused by solar
radiation and other non-fire UV sources. Furthermore, the UV channel's sensitivity is
stabilized over the working temperature range.

Reference Manual 5

Introduction

Detection levels

Simultaneous detection of radiation in both the UV and the IR channels having an intensity
that exceeds the detector's preset warning level results in a Warning signal.

Simultaneous detection of radiation in both the UV and the IR channels having an intensity
that exceeds the detector's preset alarm levels results in an Alarm signal.

Simultaneous detection of radiation in both the UV and the IR channels having an intensity
that exceeds the detector's preset flash-fire detection level results in an immediate Alarm

signal.

As the present dual range and level of radiation as well as the flickering pattern are
characteristics of real fire, all other radiation sources apart from actual fire are not
detected, thus avoiding false alarms.

1.4.2 Heated optics

The Rosemount 975 flame detectors use heated optics. The heater increases the
temperature of the optical surface by 5 to 8 °F (3 to 5 °C) above the ambient temperature
to improve performance in icing, condensation, and snow conditions.

1.4.3

The heated optics can be set to one of the following:

• Off, not operating

• On continuously

• Automatic, per temperature change (default): you can define the start temperature

below which the window is heated. The default is 41 °F (5 °C). This temperature can
be defined between 32 °F (0 °C) and 122 °F (50 °C). The heating stops when the
temperature is 27 °F (15 °C) above the start temperature.

For more information, see Section 2.8.

HART protocol

The Rosemount 975 flame detectors use the HART protocol.

HART communication is a bi-directional industrial field communication protocol used to
communicate between intelligent field instruments and host systems. HART is the global
standard for smart process instrumentation, and the majority of smart field devices
installed in plants worldwide are HART-enabled. HART is available in output configurations
1A, 2A, and 3A (see Table 1-1).

Through the HART connection, you are able to perform:

• Detector setup

• Detector troubleshooting

• Detector health and status

For more details, refer to HART Manual 00809-0200-4975.

6 Rosemount 975UF

1.4.4 RS-485 Modbus

For more advanced communications, the flame detector has an RS-485 Modbus­compatible output that provides data communication from a network (up to 247
detectors) to a host computer or universal controller for central monitoring. This feature
allows for reduced installation costs, easy maintenance, and local or remote diagnostic
tools.

1.4.5 Product certifications

The flame detectors have the following certifications:

• ATEX, IECEx

• FM

• SiL-2 (TÜV)

• EN54-10

• InMetro (UL)

• TR CU/EAC

Introduction

ATEX, IECEx

The flame detector is certified to:

ATEX per SIRA 15ATEX1364X and IECEx per IECEx SIR 15.0138X.

Ex II 2G D
Ex db eb op is IIC T4 Gb
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 accessories: tilt mount (PN 00975-9000-0001), weather cover (PN 00975-9000-0003
(plastic) and PN 00975-9000-0004 (stainless steel)), duct mount (PN 00975-9000-0002),
and air shield (PN 00975-9000-0005), are included in the approval.

This product is available to use in hazardous zones 1 and 2 with IIC gas group vapors
present and zones 21 and 22 with IIIC dust type present.

FM

The flame detector is certified to FM explosion proof and functionality per FM3260.

• Class I, Division 1, Groups B, C, and D, T5 Ta = 85 °C.

Reference Manual 7

Introduction

• Dust ignition proof - Class II/III Division 1, Groups E, F, and G.

• Ingress protection - IP67, IP66, NEMA 250 Type 6P

• For more details, see FM Report Project ID3029553.

SiL-2 (TÜV)

The flame detector is certified to SIL-2 requirement per IEC 61508A, Chapter 3.5.12.

The alert condition according to SIL-2 can be implemented by:

• Alert signal via 0-20 mA current loop.

or

• Alert signal via alarm relay and fault relay.

For more details, see TUV Report No. 968/FSP 1223.

EN54-10

The flame detector is certified to EN54-10 and CPD.

• The detector has been tested and approved per EN54-10 by Vds.

• This test includes functional test, environmental test, EMI/EMC test, and software

check.

• For more details, see Test Report BMA 13109.

InMetro (UL)

The flame detector is in compliance with the standards ABNT NBR IEC 60079-0, ABNT NBR
IEC 60079-1, ABNT NBR IEC 60079-7, ABNT NBR IEC 60079-18, ABNT NBR IEC 60079-31,
and INMETRO decree No. 179 as or May 18th, 2010. Further details may be found on
Certificate of Compliance No. UL-BR 16.065XX.

TR CU/EAC

The flame detector is in compliance with the standard TR CU 012/2011 per:

1EX db eb op is IIC T4 Gb X
Ex tb op is IIIC T96 °C Db X

-55 °C ≤ Ta ≤ +75 °C

or

1Ex db eb op is IIC T4 Gb X
Ex tb op is IIIC T106 °C Db X

-55 °C ≤ Ta ≤ +85 °C

For more details, see TR CU certificate No. TC RU C-US MЮ 62.B05535.

8 Rosemount 975UF

1.5 Performance considerations

This section describes performance aspects of the flame detector.

1.5.1 Detection sensitivity

Detection sensitivity is the maximum distance at which the detector reliably detects a
specific size of fire and typical type of fuel (standard fire).

Standard fire

Defined as 1 ft.2 (0.1 m2) n-heptane pan fire with maximum wind speed of 6.5 ft./sec (2 m/
sec).

Sensitivity ranges

The detector has two response levels:

• Warning (Pre-alarm)

Alarm

•

Introduction

The detection distance for the Alarm level is 65 ft. (20 m) from a standard fire.

The detection distance for the Warning level is approximately 10% higher than the Alarm
distance.

For some typical ambient conditions, the Zeta parameter as defined in NFPA 72 for the
detector is 0.005 (1/meter).

NOTICE

Zeta parameters may vary significantly with changes in temperature, air pressure, humidity,
visibility conditions, etc.

Other fuels

The detector reacts to other types of fire as follows:

• The baseline fire refers to n-heptane 1 ft.2 (0.1 m2) and is defined as 100%

sensitivity.

• For fuel fire: standard pan fire size: 1 ft.2 (1 m2)

• For gas flame: 30 in. (0.75 m) high, 10 in. (0.25 m) wide plume fire

• Maximum response time: 3 sec.

Fuel Sensitivity RangesTable 1-3:

Type of fuel Max. distance (ft. / m)

Gasoline 66 / 20

n-heptane 66 / 20

Reference Manual 9

Introduction

Fuel Sensitivity Ranges (continued)Table 1-3:

Type of fuel Max. distance (ft. / m)

JP5 50 / 15

Kerosene 50 / 15

Diesel fuel 50 / 15

IPA 43 / 13

(1)

LPG

Polypropylene 43 / 13

Hydrogen

(1)

Methanol 26 / 8

Methane

1

Ethanol 95% 25 / 7.5

Ammonia

(2)

Paper 16 / 5

(2)

Silane

(1) 30 in. (0.75 m) high, 10 in. (0.25 m) wide plume fire
(2) 20 in. (0.5 m) high, 8 in. (0.2 m) wide plume fire

43 / 13

37 / 11

26 / 8

20 / 6

6 / 1.8

1.5.2 Cone of vision

• Horizontal: 100 °

Horizontal Field of ViewFigure 1-1:

10 Rosemount 975UF

• Vertical: +50 ° (down), -40 ° (up)

Vertical Field of ViewFigure 1-2:

Introduction

Reference Manual 11

Introduction

1.5.3 False alarms prevention

To prevent false alarms, the detector will not alarm or react to the radiation sources
specified in the table below.

Immunity to False Alarm SourcesTable 1-4:

Radiation source Immunity distance ft. (m)

Indirect or reflected sunlight IAD

Vehicle headlights (low beam) conforming to
MS53023-1

Incandescent frosted glass light, 300 W IAD

Fluorescent light with white enamel reflector,
standard office or shop, 70 W (or two 35 W)

Electric arc [15/32 in. (12 mm) gap at 4,000 Vac,
60 Hz]

Arc welding [5/16 in. (6 mm) rod; 210 A] 9.8 (3)

Ambient light extremes (darkness to bright light
with snow, water, rain, desert glare, and fog)

Bright colored clothing, including red and safety
orange

Electronic flash (180 W-seconds minimum out­put)

Movie light, 625 W quartz DWY lamp (Sylvania
S.G. - 55 or equivalent)

Blue-green dome light conforming to
M251073-1

Flashlight (MX 99 I/U) IAD

Radiation heater, 3,000 W IAD

Radiation heater, 1,000 W with fan IAD

Quartz lamp (1,000 W) 12 (4)

Mercury vapor lamp IAD

Grinding metal 3.3 (1)

Lit cigar IAD

Lit cigarette IAD

Match, wood, stick, including flare up 3.3 (1)

IAD

IAD

IAD

IAD

IAD

IAD

> 6.5 (2)

IAD

1. IAD: Immune at any distance.

2. All sources are chopped from 0 to 20 Hz.

12 Rosemount 975UF

1.5.4 Visual indicators

One three-color LED indicator is located inside the detector window, as shown in

Figure 1-3. The detector statuses are listed in Table 1-5.

LED IndicationsTable 1-5:

Detector status LED color LED mode

Fault, BIT Fault Yellow 4 Hz - flashing

Normal Green 1 Hz - flashing

Warning Red 2 Hz -flashing

Alarm Red Steady

Indication LEDFigure 1-3:

Introduction

A. Indicator LED

1.5.5

Reference Manual 13

Output signals

Outputs are available according to the default configuration or the wiring options selected
for the detector.

Introduction

Determine the outputs of your model according to Table 1-6.

The detector incorporates several types of output suitable to different control systems.

• 0-20 mA (stepped) with HART

• Relays (alarm, fault, auxiliary)

• RS-485 Modbus

• Analog output - analog output proved ultra-fast detection to comply with twenty

millisecond detection

Available Output TypesTable 1-6:

Output type Version Detector status

Alarm relay 975UF- output configurations

1AXXXXX, 1RXXXXX, and
2RXXXXX

975UF - output configurations
2AXXXXX and 3AXXXXX

Auxiliary relay 975UF - output configurations

1AXXXXX, 2AXXXXX, and
1RXXXXX

Fault relay 975UF - output configurations

1AXXXXX, 2AXXXXX, and
1RXXXXX

975UF - output configurations
3AXXXXX and 2RXXXXX

0-20 mA current output 975UF - output configuration

1AXXXXX

975UF - output configurations
2AXXXXX and 3AXXXXX

RS-485 All versions Modbus protocol

Analog output All versions 0 V during normal

The relay is N.O.

The relay is N.O. and N.C.

The relay is N.O.

The relay is N.C. energized.

The relay is N.O. energized.

Sink with the HART protocol
(can be changed to Source - see

Figure B-3, Figure B-4, and
Figure B-5).

Source with the HART protocol

5 V during detection

1.5.6 Detector status

The possible detector function statuses are listed in the table below. A more detailed fault
analysis can be seen via HART or RS-485.

Detector StatusesTable 1-7:

Status Description

Normal Normal operation.

14 Rosemount 975UF

Introduction

Detector Statuses (continued)Table 1-7:

Status Description

BIT Built-in test being performed.

Warning Fire detected - changed to Warning (pre-alarm state).

Alarm Fire detected - changed to Fire Alarm state.

Latched alarm (optional) The alarm outputs remain latched on following detection of a fire

that has already been extinguished.

BIT fault A fault is detected during built-in test sequence or other electric fail-

ure. The detector will continue to detect for fire.

Fault A fault is detected when the power supply is too low or due to a soft-

ware fault or electrical failure. The detector will not detect fire in this
condition.

In each state, the detector activates different outputs, as specified in Table 1-8.

Output Signals vs. Detector StateTable 1-8:

Detector state LED indicator LED mode Alarm relay Auxiliary relay Fault relay mA output

Normal Green 1 Hz Off Off On 4 mA

On

(1)

(1)

(1)

On 16 mA

On 20 mA

Off 16 mA

Warning Red 2 Hz Off On

(2)

Alarm

(3)

Latch

BIT Fault

(4)

Warning at BIT

Red Constant On On On 20 mA

Red Constant On Off On 20 mA

Yellow 4 Hz Off Off Off 2 mA

Red 2 Hz Off On

Fault

Alarm at BIT

Red Constant On On Off 20 mA

Fault

Fault Yellow 4 Hz Off Off Off 0 mA

(1) The auxiliary relay can be activated at the Warning level or Alarm level, depending on programmed function.
(2) The alarm outputs are activated while alarm conditions exist and will stop approximately five seconds after a fire is no longer detected.

(3) The Alarm state can be optionally latched via programmed function. (Default is non-latching).
(4) The detector will remain in BIT Fault state until it has passed a successful built-in test.

Note

The outputs depend on the output configurations.

Optional latching

Alarms are set as non-latching by default. However, the detector includes a latched alarm
output capability, which operates according to the programmed function.

Reference Manual 15

Introduction

If selected, upon detection of a fire, the detection signal is latched until a manual reset is
performed (disconnecting the power supply).

Latching affects the alarm relay, 0-20 mA output, and the alarm LED. The auxiliary relay is
latched only when the programmable function Auxiliary Relay is set to Yes.

NOTICE

The auxiliary relay is available only in models with output configurations - 1RXXXXX and
2RXXXXX.
The 0-20 mA is available only in models with output configurations - 1AXXXXX, 2AXXXXX, and
3AXXXXX.

1.6 Internal detector tests

The detector performs two types of self-tests:

• Continuous feature test (Section 1.6.1)

• Built-in test (BIT) (Section 1.6.2)

1.6.1 Continuous feature test

During normal operation, the detector tests itself continuously and indicates a fault if a
failure is found. This type of test complies with SIL-2 requirements.

The detector continuously tests:

• Input voltage level

• All internal regulator voltage level

• Voltage level status of sensor and sensor circuitry for noise or disconnection in the

electronic circuitry

• 0-20 mA level output

• Relays and heater operation

• Processor watch dog

• Software

• Memory

• Oscillator frequency

Response to a fault indication

If a failure is found, the detector indicates it by:

• Fault relay:

- Opens in output configurations 1A, 2A, and 1R

- Closes in output configurations 3A and 2R

• 0-20 mA: indicates fault (0 mA or 2 mA) in output configurations 1A, 2A, and 3A

16 Rosemount 975UF

• LED - yellow flashes (4 Hz)

• Correcting the fault

The fault indications remain until the detector's power is removed. The fault indications
return if the fault is still found when power is restored.

1.6.2 Built-in test (BIT)

The detector's built-in test (BIT) also checks the following:

• Electronics circuitry

• Sensors

• Window cleanliness

The detector can be set to perform the built-in test automatically.

How the built-in test operates

• The detector's status remains unchanged if the result of a built-in test is the same as

the current status (Normal or BIT Fault).

Introduction

• The detector's status is changed (from Normal to BIT Fault or vice versa) if the built-in

test differs from the current status.

NOTICE

In BIT Fault status, the detector can continue to detect a fire.

Automatic built-in test

The detector automatically performs a built-in test every fifteen minutes. A successful
built-in test sequence does not activate any indicator.

All outputs of built-in test results function as described in Table 1-9 and Table 1-10, and the
built-in test is automatically executed every one minute.

This continues until a successful built-in test occurs, when the detector resumes normal
operation.

Results of a Successful Built-in TestTable 1-9:

Output Result

Fault relay • Output configurations 1A, 2A, and 1R: re-

main CLOSED

• Output configurations 3A and 2R: remain

OPEN

0-20 mA output Output configurations 1A, 2A, and 3A: Normal (4

mA)

Power LED Green, flashing, 1 Hz on (Normal)

Reference Manual 17

Introduction

Results of an Unsuccessful Built-in TestTable 1-10:

Output Result

Fault relay • Output configurations 1A, 2A, and 1R:

change to OPEN

• Output configurations 3A and 2R: change to

CLOSED

0-20 mA output Output configurations 1A, 2A, and 3A: BIT Fault

(2 mA)

Power LED Yellow, flashing, 4 Hz

BIT procedure Performed every one minute

18 Rosemount 975UF

2 Installing the detector

This chapter provides basic guidelines for installing the detector. It does not attempt to
cover all of the standard practices and codes of installation. Rather, it emphasizes specific
points of consideration and provides some general rules for qualified personnel. Wherever
applicable, special safety precautions are stressed.

2.1 General guidelines

To ensure optimal performance and an efficient installation, consider the following
guidelines:

• Sensitivity: To determine the level of sensitivity, consider the following:

- Size of fire at the required distance to be detected

- Type of flammable materials

• Wiring:

- The wire gauge must be designed according to the distance from the detector to

the controller and the number of detectors on the same power line. See

Appendix B.

- To fully comply with EMC directive and protect against interference caused by

RFI and EMI, the cable to the detector must be shielded, and the detector must
be grounded. The shield should be grounded at the detector end.

• Spacing and location: The number of detectors and their locations in the protected

area are determined by:

- Size of the protected area

- Sensitivity of the detectors

- Obstructed lines of sight

- Cone of view of the detectors

• Environment:

- Dust, snow, or rain can reduce the detector's sensitivity and require more

maintenance activities.

- The presence of high intensity flickering IR sources may affect sensitivity.

• Aiming the detector:

- The detector should be aimed toward the center of the detection zone and have

a completely unobstructed view of the protected area.

- Whenever possible, the detector face should be tilted down at a 45 ° angle to

maximize coverage and prevent accumulation of dust and dirt.

- Do not start an installation unless all conceivable considerations regarding

detection location have been taken into account.

Installing the detector

Reference Manual 19

Installing the detector

Installations should comply with NFPA 72E or any other local and international regulations
and standards, as applicable to flame detectors and installation of Ex approved products.

2.2 Unpacking the product

Unpack the flame detector.

1. Upon receipt of your detector, verify that you have received the following contents:

• Delivery form

• Flame detector

• Plastic weather cover

• Quality document

2. Check and record the following:

a. Verify the appropriate purchase order.
b. Record the model number and serial number of the detector and the installation

date in an appropriate log book.

c. Verify that all components required for the detector installation are readily

available before beginning the installation.

2.2.1

2.3

If the installation is not completed in a single session, secure and seal the
detectors and conduits/cable entries.

Checking the product type

Check that your product has the configuration options that you ordered.

Check the detailed model number on the label and compare this information with the
descriptions contained in Section 1.2.

Required tools

The detector can be installed using general-purpose common tools and equipment.

Table 2-1 lists the specific tools required to install the detector.

ToolsTable 2-1:

Tool Function Comments

Hex key 3/16-in. Open and close the detector

cover (for wiring).

Hex key 1/4-in. Mount the detector on the tilt

mount.

Extraction key Extract the detector cover. Part of the kit

Part of the kit

Part of the kit

20 Rosemount 975UF

Tools (continued)Table 2-1:

Tool Function Comments

Flat screwdriver 6 mm Connect ground terminal. Standard tool

Flat screwdriver 2.5 mm Connect wires to the terminal

blocks.

For wiring, use color-coded conductors or suitable wire markings or labels. 12 to 20 AWG
(0.5 mm2 to 3.5 mm2) wires may be used for site wiring. Select wire gauge based on the
number of detectors used on the same line and the distance from the control to the
ground unit, in compliance with specifications (see Section B.1).

2.4 Certification instructions

WARNING!

FLAMMABLE
Do not open the detector, even when isolated, in a flammable atmosphere.

Installing the detector

Standard tool

Use the following certification instructions:

• The cable entry point may exceed 167 °F (75 °C). Take suitable precautions when

selecting the cable.

• The equipment may be used with flammable gases and vapors with apparatus

groups IIA, IIB, and IIC:

- T5 in the ambient temperature range: -67 °F (-55 °C) to 167 °F (75 °C)

- T4 in the ambient temperature range: -67 °F (-55 °C) to 185 °F (85 °C)

• Only suitably trained personnel should install the detector, in accordance with the

applicable code of practice, such as EN 60079-14:1997.

• Only suitably trained personnel should inspect and maintain the detector, in

accordance with the applicable code of practice, such as EN 60079-17.

• Only suitably trained personnel should repair the detector, in accordance with the

applicable code of practice, such as EN 60079-19.

• The certification of this equipment relies upon the following materials used in its

construction:

- Enclosure: 316L stainless steel or aluminum

- Window: sapphire glass

• If the equipment is likely to come into contact with aggressive substances, take

suitable precautions to prevent it from being adversely affected, thus ensuring that
the type of protection provided by the equipment is not compromised.

- Aggressive substances: acidic liquids or gases that may attack metals or solvents

that may affect polymeric materials.

- Suitable precautions: regular checks as part of routine inspections or establishing

from the material's data sheets that it is resistant to specific chemicals.

Reference Manual 21

Installing the detector

Refer to Section 1.4.5 for more information about product certifications.

2.5 Install cables

Observe the following guidelines for the cable installation.

• All cables to the detector must be well shielded in order to comply with EMC

requirements (see Section D.1.7).

• Ground the detector to the nearest ground point (not more than 9.8 ft. (3 m) from

the flame detector location).

• Install the detector with the cable entries pointed downwards.

2.5.1 Conduit installation

The conduit used for the cabling must comply with the following:

• To avoid water condensation in the detector, install the detector with the conduits

that include drain holes, pointed downwards.

• When using the optional tilt mount, use flexible conduits for the last portion

connecting to the detector.

• For installation in atmospheres as defined in group B of the NFPA 72E, seal the

conduit inlets.

• When pulling the cables through the conduits, ensure that they are not tangled or

stressed. Extend the cables about12 in. (30 cm) beyond the detector location to
accommodate wiring after installation.

• After the conductor cables have been pulled through the conduits, perform a

continuity test.

2.6

22 Rosemount 975UF

Install the tilt mount (PN 00975-9000-0001)

The tilt mount enables the detector to rotate up to 60 ° in all directions.

Figure 2-1 shows the detector mounted on the tilt mount..

Installing the detector

Detector with Tilt MountFigure 2-1:

2.6.1

A. Cover bolts
B. Back cover
C. Tilt mount plate
D. Horizontal locking screw
E. Tilt mount
F. Vertical locking screw
G. Detector holding screw
H. Tilt mount holding plate
I. Conduit/cable inlet
J. Detector assembly

Tilt mount assembly

Figure 2-2 shows the tilt mount assembly.

Reference Manual 23

Installing the detector

Tilt Mount AssemblyFigure 2-2:

A. Tilt holding plate
B. Tilt mount
C. Horizontal locking screw
D. Vertical locking screw
E. Detector holding plate

24 Rosemount 975UF

Installing the detector

Tilt Mount Assembly (Dimensions in Both Inches and Millimeters)Figure 2-3:

To install the tilt mount and detector:

1. Place the tilt mount in its designated location and secure it with four (4) fasteners
through four (4) holes 0.14 in. (7 mm) in diameter. Use the four (4) screws and
spring washers according to the kit (see Table 2-2 and Table 2-3).

NOTICE

Removing the detector for maintenance purposes does not require the tilt mount to be
removed.

2. Unpack the detector.

3. Place the detector with its conduit/cable entries pointing downwards on the holding
plate of the tilt mount. Secure the detector with 5/16-in. 18 UNC x 1-in. screw to the
tilt mount.

4. Release the horizontal and vertical locking screws using the supplied 3/16-in. hex
key, such that the detector can be rotated. Point the detector towards the protected
area and make certain that the view of the area is unobstructed. Secure the detector
in that position by tightening the locking screws on the tilt mount. (Make sure the
detector is in the correct position).

The detector is now correctly located, aligned, and ready to be connected to the system.

Reference Manual 25

Installing the detector

2.7 Connecting the detector

To connect the detector to the electrical cables:

Procedure

1. Disconnect the power.

2. Remove the back cover of the detector by removing three (3) socket head screws in
the cover bolts. Refer to Figure 2-1.

The terminal chamber is now revealed.

3. Remove the protective plug mounted on the detector conduit/cable entry; pull the
wires through the detector inlet.

4. Use a 3/4-in. - 14 NPT explosion-proof conduit connection or M25 x 1.5 flameproof
gland to assemble the cable/conduit to the detector.

5. Connect the wires to the required terminals on the terminal board according to the
wiring diagram (Figure 2-4 and Table 2-2).

26 Rosemount 975UF

Installing the detector

Detector with Cover RemovedFigure 2-4:

A. Terminal chamber
B. Terminals
C. Internal earth terminal
D. Earth terminal
E. Detector holding screw
F. Conduit/cable entry

6. Connect the grounding (earth) wire to the ground (earth) screw outside the flame
detector (earth terminal).

The detector must be well-grounded to earth ground.

7. Verify the wiring.

Improper wiring may damage the flame detector.

Reference Manual 27

Installing the detector

8. Check the wires for secure mechanical connection and press them neatly against the
terminal to prevent them from interfering while closing the back cover (Figure 2-4).

9. Place and secure the detector's back cover by screwing the three (3) socket-head
screws in the cover bolts (Figure 2-1).

2.7.1 Verify the detector wiring

The flame detector has five output configurations within the Exde integral terminal section
of the enclosure. There are twelve terminals labeled 1 - 12.

Table 2-2 describes the function of each terminal for all the output configurations.

Rosemount 975UF Output ConfigurationsTable 2-2:

Wire terminal
number 1A (default) 2A 3A 1R 2R

1 +24 Vdc +24 Vdc +24 Vdc +24 Vdc +24 Vdc

2 0 Vdc 0 Vdc 0 Vdc 0 Vdc 0 Vdc

3 Analog output Analog output Analog output Analog output Analog output

4 Fault relay N.C. Fault relay N.C. Fault relay N.O. Fault relay N.C. Fault relay N.O.

5

6 Alarm relay N.O. Alarm relay N.O. Alarm relay N.O. Alarm relay N.O. Alarm relay N.O.

7 Alarm relay C Alarm relay C Alarm relay C Alarm relay C Alarm relay C

8 0-20 mA in Alarm relay N.C. Alarm relay N.C. Auxiliary N.O. Auxiliary N.O.

9 0-20 mA out

10 RS-485 + (1) RS-485 + (1) RS-485 + (1) RS-485 + (1) RS-485 + (1)

11 RS-485 - (1) RS-485 - (1) RS-485 - (1) RS-485 - (1) RS-485 - (1)

12 RS-485 GND RS-485 GND RS-485 GND RS-485 GND RS-485 GND

(1) Available with the HART protocol.

(1)

0-20 mA out

(1)

0-20 mA out

(1)

Auxiliary C Auxiliary C

Notes

• RS-485 is used for network communication as specified in Appendix C (terminals 10,

11, and 12) and to connect (in safe area) to PC/laptop for configuration/diagnostics.

• Alarm relay

- N.O. in output configuration 1A, 1R, and 2R

- N.O. and N.C. in output configuration 2A and 3A

• 0-20 mA is Sink in output configuration 1A and Source in output configurations 2A

and 3A.

• 0-20 mA output configurations 1A, 2A, and 3A are available with the HART protocol.

• In output configuration 1A, link terminals 1 and 8 to change the mA output to

Source.

28 Rosemount 975UF

• The fault output is N.C. energized SPST relay. The contacts are closed when the

detector is in its normal operational condition in output configurations 1A, 2A, and
1R and available as N.O. energized in output configurations 3A and 2R.

• The auxiliary output is N.O. energized (SPST) relay. The auxiliary relay may act in

parallel with the alarm relay to activate another external device or it may provide a
warning signal, depending on the function configuration.

2.8 Configuring your detector

You can reprogram the function setup using the RS-485 connection or using the HART
protocol as follows:

• USB RS-485 harness kit (PN 00975-9000-0011): The USB RS-485 harness kit with

RS-485/USB converter, used with the Rosemount host software, enables you to
connect to any available PC or laptop to reconfigure settings or perform diagnostics
on all Rosemount 975 series flame detectors.

Refer to manual 00809-0300-4975 for programming instructions when using the
USB RS-485 harness kit.

• HART protocol: Refer to manual 00809-0200-4975 for programming instructions.

Installing the detector

2.8.1

These functions enable you to set:

• Alarm delay

• Address setup

• Mode of operation

• Heated optics operation

The factory default settings listed for each function are:

• Alarm delay: 0 sec

• Alarm latch: No

• Auxiliary relay: No

• Heated optics: Auto

• Temperature: 5 °C (41 °F)

Alarm delay

The flame detector is equipped with an alarm delay option, which provides programmable
time delay with settings at:

• Antiflare

Other delay settings are available:

• 0, 3, 5, 10, 15, 20, or 30 seconds

(1)

(1) The Antiflare mode is selected to prevent false alarms in locations where fast flares may be present. The time delay for fire alarms in this

mode ranges from 2.5 to 15 seconds (usually less than 10 seconds).

Reference Manual 29

Installing the detector

When an alarm (detection) level condition occurs, the flame detector delays the execution
of the alarm outputs by the specified period of time. The detector then evaluates the
condition for three seconds. If the alarm level is still present, the alarm outputs are
activated. If this condition no longer exists, the detector returns to its standby state.

The alarm delay option affects the output relays and the 0-20 mA. The LEDs and outputs
indicate warning levels during the delay time only if the fire condition exists.

2.8.2 Address setup

The flame detector provides up to 247 addresses that can be changed with the RS-485
communication link or the HART communication protocol.

2.8.3 Function setup

You can select the desired functions as detailed in Table 2-3.

FunctionsTable 2-3:

Function Setting

Alarm latch • Yes: Enable alarm latching.

Auxiliary relay

Automatic BIT • Yes: Perform automatic built-in test (default).

(1) Only available in output configurations 1R and 2R.

(1)

• No: Disable alarm latching (default).

• Yes: Activate auxiliary relay at warning level.

• No: Activate auxiliary relay at alarm level (default).

• No: No BIT.

2.8.4

30 Rosemount 975UF

Heated optics

The heated optics can be defined as one of the following modes:

• OFF: Not operated

• ON: Continuously

• AUTO: Per temperature change

In AUTO mode, the default Heat On setting is 41 °F (5 °C). Heating stops when the
temperature is 27 °F (15 °C) above the start temperature.

You can define the start temperature below which the window will be heated. The
temperature can be defined between 32 and 122 °F (0 and 50 °C).

3 Operating the detector

This chapter describes how to power up and test the detector. It also includes some very
important safety checks that you should make before operating the detector.

3.1 Powering up

This section describes how to power up the detector. Follow these instructions carefully to
obtain optimal performance from the detector over its life cycle.
To power up the detector:

Procedure

1. Turn on the power.

2. Wait approximately sixty seconds for the detector to finish the startup procedure.

Operating the detector

3.2

Applying power initiates the following sequence of events:

• The yellow LED flashes at 4 Hz.

• Built-in test is executed.

If successful, the green LED flashes at 1 Hz, and the FAULT relay contacts close; mA
output is 4 mA.

3. Enter Normal mode.

NOTICE

The majority of detectors are used in the default non-latching alarm mode. Only
perform a reset when the latching alarm option has been programmed.

To reset the detector when it is in a Latched Alarm state:

• Disconnect power (terminal number 1 or terminal number 2).

Safety precautions

After powering up, the detector requires almost no attention in order to function properly,
but note the following:

• Follow the instructions in this guide and refer to the drawings and specifications.

• Do not expose the detector to radiation of any kind unless required for testing

purposes.

• Do not open the detector housing while power is applied.

Reference Manual 31

Operating the detector

• Do not open the electronic compartment. This part should be kept closed at all

times and only opened in the factory. Opening the electronic component side
invalidates the warranty.

• Only access the wiring compartment to wire or remove the detector or access

RS-485 terminals for maintenance.

• Disconnect or disable external devices, such as automatic extinguishing systems,

before carrying out any maintenance.

3.2.1 Default function settings

Table 3-1 lists the default function configurations supplied with the detector.

Default Function ValuesTable 3-1:

Function Value Notes

Alarm delay 0 sec

Alarm latch No

Auxiliary relay No In output configurations 1A,

Automatic built-in test (BIT) Yes

EOL No In output configurations 1A,

Heat mode Auto

Heat on 41 °F (5 °C) The detector starts heating the

2A, and 3A, the auxiliary relay is
not available. This function is
not used.

2A, and 3A, the auxiliary relay is
not available. This function is
not used.

window for any temperature
below this value.

In order to change the default function, use:

• USB RS-485 harness kit PN 00975-9000-0011. Refer to manual 00809-0300-0975 for

programming instructions when using the USB RS-485 harness kit.

• HART® protocol. Refer to manual 00809-0200-4975 for instructions.

3.3

32 Rosemount 975UF

Testing procedures

This section describes the proof testing procedure for proper operation of the detector.
The detector can be tested usingthe flame simulator (FS-UVIR-975).

The detector performs the internal test continuously and the automatic built-in test every
fifteen minutes; for more details, refer to Section 1.6.2 .

3.3.1 Automatic built-in test

Check that the indicators show normal conditions.

See Section 3.1.

3.3.2 Testing with flame simulator - FS-UVIR-975

The flame simulator (FS-UVIR-975) can be used to simulate exposure of the detector to a
real fire condition. The detector is exposed to radiation at the required detection level. As a
result, the detector generates a fire alarm signal.
See Section D.1 for more information.

NOTICE

If the detector is exposed to a flame simulator, the alarm and accessory relays and 0-20 mA are
activated during the simulation. Therefore, automatic extinguishing systems or any external
devices that may be activated during this process must be disconnected.

To perform a flame simulator test:

Operating the detector

Procedure

1. Power up the system and wait up to sixty seconds for the detector to turn to a
normal state.

The power LED turns on.

2. Aim the flame simulator (FS-UVIR-975) at the target point of the detector, in a way
that the radiation emitted by it is facing directly towards the detector.

See Section D.1.

3. Press Operation once.

After a few seconds, a successful test shows the results shown in Table 3-2.

Results of a Successful Flame Simulator TestTable 3-2:

Component Action Notes

0-20 mA Turns to 20 mA For a few seconds and then re-

turns to 4 mA

Analog output Turns to 5 Vdc Then returns to 0 V

Alarm relay Activated For a few seconds and then re-

turns to Normal

Auxiliary relay Activated For a few seconds and then re-

turns to Normal

Fault relay Remains active during the test

LED Red, steady

Reference Manual 33

Operating the detector

The detector is now ready for operation.

34 Rosemount 975UF

Maintenance and troubleshooting

4 Maintenance and troubleshooting

This chapter deals with preventative maintenance, describes possible faults in detector
operation, and indicates corrective measures. Ignoring these instructions may cause
problems with the detector and may invalidate the warranty. Whenever a unit requires
service, please contact Rosemount™ or its authorized distributer for assistance.

4.1 Maintenance

This section describes the basic maintenance steps you should take to keep the detector in
good working condition.

4.1.1 General procedures

Only suitably quailified personnel who are familiar with local codes and practices should
perform maintenance. Maintenance requires ordinary tools.

4.1.2

Cleaning

Keep the detector as clean as possible. Clean the viewing window and the reflector of the
flame detector periodically.
The frequency of cleaning operations depends upon the local environmental conditions
and specific applications. The fire detection system designer will give his or her
recommendations.

To clean the detector viewing window and reflector:

Procedure

1. Disconnect power to the detector before proceeding with any maintenance,
including window/lens cleaning.

2. Use water and detergent and then rinse the viewing window with clean water.

3. Where dust, dirt, or moisture accumulates on the window, first clean only with a soft
optical cloth and detergent and then rinse with clean water.

Periodic procedures

In addition to preventive cleaning and maintenance, functionally test the detector every
six months or as dictated by local codes and regulations. Also perform these tests if the
detector has been opened for any reason.

Power-up procedure

Perform the power-up procedure every time power is restored to the system.

Reference Manual 35

Maintenance and troubleshooting

Follow the instructions described in Section 3.1.

Functional test procedure

Perform a functional test of the detector as described in Section 1.6.

4.1.3 Keeping maintenance records

™

Emerson
in a log book. The record should include the following:

• Installation date and contractor

• Serial and tag number

• Entries for every maintenance operation performed, including the description of the

If you send a unit to Rosemount or a distributer for service, include a copy of the
maintenance records.

recommends that you record maintenance operations performed on a detector

operation, date, and personnel ID

36 Rosemount 975UF

Maintenance and troubleshooting

4.2 Troubleshooting

This section is intended to be a guide to correct problems that may happen during normal
operation.

Troubleshooting TableTable 4-1:

Problem Cause Corrective action

LEDs off
Fault relay at N.O.
0-20 mA at 0 mA

Yellow LED flashes at 4 Hz
Fault relay at N.O.
0-20 mA at 0 mA

Yellow LED flashes at 4 Hz
Fault relay at N.O.
0-20 mA at 2 mA

Red LED constantly on If no fire exists, then detector alarm

Alarm relay at On
0-20 mA at 20 mA

No power at the unit • Check that the correct power is

sent to the detector.

• Check power polarity.

• Check wiring in the detector.

• Send the detector back for repairs.

Fault detector

• Low voltage

• Faulty detector

BIT fault

• Faulty detector

latched

Alarm condition • Check cause for alarm.

• Check the voltage at the detector;

verify at least 24 V at the detector
terminal.

• Send the detector back for repairs.

• Clean detector window.

• Re-power the detector.

• Replace the detector.

Reset the detector.

• If no alarm, re-power the detector.

• Send the detector back for repairs.

Reference Manual 37

Maintenance and troubleshooting

38 Rosemount 975UF

Appendix A
Specifications

A.1 Technical specifications

Technical SpecificationsTable A-1:

Spectral response UV: 0.185 to 0.260 µm

IR: 2.5 to 3.0 µm

Specifications

Detection range (at
highest sensitivity
setting for 1 ft.2 (0.1
m2) pan fire

Response time Typically 3 seconds

Adjustable time delay Up to 30 seconds

Sensitivity ranges 1 ft.2 (0.1 m2) n-heptane pan fire from 20 m (65 ft)

Fields of view Horizontal: 100 °, vertical: 90 °

Built-in test (BIT) Automatic (only)

(1) 30 in. (0.75 m) high, 10 in. (0.25 m) wide plume fire
(2) 20 in. (0.5 m) high, 8 in. (0.2 m) wide plume fire

Fuel ft. / m Fuel m / ft

n-Heptane 66 / 20 Hydrogen

Gasoline 66 / 20 Methane

Diesel fuel 50 / 15 Methanol 26 / 8

JP5 50 / 15 Ethanol 95% 2.5 / 7.5

(1)

LPG

IPA (isopropyl alcohol) 43 / 13 Silane

Polypropylene pellets 43 / 13

High speed 20 msec response to flash fire

43 / 13 Office paper 16 / 5

(2)

(1)

(1)

37 / 11

26 / 8

16 / 5

A.2

Reference Manual 39

Electrical specifications

Operating voltage: 18 - 32 Vdc

Power consumption: Table A-2

Electrical SpecificationsTable A-2:

Operating voltage Status All outputs Without 0-20 mA

Power consumption
(max. 24 Vdc)

Normal 1.61 W 1.56 W

Normal when heateron2.28 W 2.16 W

Specifications

Electrical Specifications (continued)Table A-2:

Operating voltage Status All outputs Without 0-20 mA

Alarm 2.64 W 2.28 W

Alarm when heater on 3.24 W 2.88 W

Maximum current
(max. 24 Vdc)

Power consumption
(max. 18-32 Vdc)

Maximum current (18 ­32 Vdc)

Normal 70 mA 65 mA

Normal when heateron95 mA 90 mA

Alarm 110 mA 95 mA

Alarm when heater on 135 mA 120 mA

Normal 1.95 W 1.85 W

Normal when heateron2.56 W 2.45 W

Alarm 3.04 W 2.56 W

Alarm when heater on 3.68 W 3.2 W

Normal 90 mA 85 mA

Normal when heateron105 mA 100 mA

A.3

Alarm 130 mA 115 mA

Alarm when heater on 160 mA 145 mA

Electrical input protection: The input circuit is protected against voltage-reversed polarity,
voltage transients, surges, and spikes according to MIL-STD-1275B

Outputs

Electrical
interface

There are five output configurations. These configurations must be defined
at the factory per the customer order and cannot be changed at the
customer facility.
See Section B.1 for the wiring/terminal diagrams for each option.
Unless otherwise specified, the default is output configuration 1A. The
wiring arrangement is identified on the detector by the part number (see

Section 1.2).

• Output configuration 1A: power, RS-485, 0-20 mA (sink), fault relay

(N.C.), alarm rela (N.O.)

• Output configuration 2A: power, RS-485, 0-20 mA (source) and

HART® protocol, analog output, fault relay (N.O.), alarm relay (N.O.,
N.C.)

• Output configuration 3A: power, RS-485, 0-20 mA (source) and HART

protocol, analog output, fault relay (N.O.), alarm relay (N.O., N.C.)

• Output configuration 1R: power, RS-485, analog output, fault relay

(N.C.), auxiliary relay (N.O.), alarm relay (N.O.)

40 Rosemount 975UF

Specifications

• Output configuration 2R: power, RS-485, analog output, fault relay

(N.O.), auxiliary relay (N.O.), alarm relay (N.O.)

Electrical
outputs

• Dry contact relays

Contact RatingsTable A-3:

Normal posi-

Relay name Type

Alarm SPDT N.O., N.C. 2 A at 30 Vdc

Auxiliary SPST N.O. 2 A at 30 Vdc

Fault (see notes
1 and 2)

SPST N.C. or N.O. 2 A at 30 Vdc

tion

Maximum rat­ings

1. The fault relay (in output configurations 1A, 2A, and 1R) is

normally energized closed during normal operation of the
detector. The relay is de-energized open if a fault condition or low
voltage situation occurs.

2. In output configurations 3A and 2R, the relay is normally energized

open during normal operation of the detector. The relay is de­energized closed contact if a fault condition or low voltage
situation occurs.

• 0-20 mA current output: The 0-20 mA can be Sink or Source according

to the output configuration (see Section B.1) . The maximum
permitted load resistance is 600 Ω.

20 mA Current OutputTable A-4:

State Output

Fault 0 + 1 mA

BIT fault 2 mA ± 10%

Normal 4 mA ± 10%

IR 8 mA ± 5%

UV 12 mA ± 5%

Warning 16 mA ± 5%

Alarm 20 mA ± 5%

• Analog output: The analog output is used for fast detection signal 20

msec. It provides 0 v at Normal and 5 V at Alarm.

• HART protocol: The HART protocol is a digital communication signal

at a low level on top of the 0-20mA. This is a bi-directional field
communication protocol used to communicate between intelligent
field instruments and the host system. HART is available in output
configurations 1A, 2A, and 3A.

Reference Manual 41

Specifications

Through the HART protocol, the detector can:

- Display setup.

- Reconfigure the setup.

- Display detector status and definition.

- Perform detector diagnostics.

- Troubleshoot.

For more details, refer to HART Manual 00809-0200-4975.

• Communication network: The detector is equipped with an RS-485

communication link that can be used in installations with
computerized controllers.
The communication protocol is Modbus® compatible.

- This protocol is standard and widely used.

- It enables continuous communication between a standard Modbus

controller (master device) and a serial network of up to 247
detectors.

Heated
optics

The front window can be heated to improve performance in icing,
condensation, and snow conditions. The heater increases the temperature
of the optical surface by 5 to 8 °F (3 to 5 °C) above the ambient temperature.
The heated optics can be configured in three ways:

• OFF: The optics are not heated.

• ON: The optics are heated continuously.

• AUTO: Operated only when the change of temperature requires

In AUTO mode, the start heating temperature can be defined between 32
and 122 °F (0 and 50 °C). The detector stops heating the window when the
temperature is 27 °F (15 °C) above the start temperature.

A.4 Approvals

Hazardous
area
approvals

• FM, CSA

• ATEX, IECEx

heating (default).

Class I Div. 1 Groups, B, C, and D;
Class II/III Div. 1 Groups E, F, and G

Ex II 2 G D
Ex db eb op is IIC T4 Gb
Ex tb op is IIIC T 96 °C Db
(-55 °C ≤ Ta ≤ +75 °C)
or
Ex II 2 G D
Ex db eb op is IIC T4 Gb
Ex tb op is IIIC is 106 °C Db
(-55 °C ≤ Ta ≤ +85 °C)

42 Rosemount 975UF

• TR CU / EAC

1EX db eb op is IIC T4 Gb XEx tb op is IIIC T96 °C Db X

-55 °C ≤ Ta ≤ +75 °C
or
1Ex db eb op is IIC T4 Gb XEx tb op is IIIC T106 °C Db X

-55 °C ≤ Ta ≤ +85 °C

Specifications

Functional
approvals

• EN54-10 approved by VdS

• FM approved per FM 3260

A.5 Mechanical specifications

Enclosure

Water and dust tight

Electronic modules
Electrical connection

(two entries)

Dimensions
Weight

Stainless steel 316 or aluminum, heavy duty, copper-free (less
than 1%), red epoxy enamel finish

• NEMA® 250 type 6p.

• IP 66 and IP 67 per EN 60529

Conformal coated

• 3/4 in. -14 NPT conduit or

• M25 x 1.5

4 x 4.6 x 6.18 in. (101.6 x 117 x 157 mm)
Stainless steel: 6.1 lb. (2.8 kg)

Aluminum: 2.8 lb. (1.3 kg)

A.6 Environmental specifications

The Rosemount

High
temperature

Low
temperature

Humidity

Salt fog

Reference Manual 43

™

975UF is designed to withstand harsh environmental conditions.

• Designed to meet MIL-STD-810C, method 501.1, procedure II

• Operating temperature: 167 °F (75 °C)

• Storage temperature: 185 °F (85 °C)

• Designed to meet MIL-STD-810C, method 502.1, procedure I

• Operating temperature: -57 °F (-50 °C)

• Storage temperature: -65 °F (-55 °C)

• Designed to meet MIL-STD-810C, method 507.1, procedure IV

• Relative humidity of up to 95 percent for the operational

temperature range

• Designed to meet MIL-STD-810C, method 509.1, procedure I

• Exposure to a 5 percent salt solution fog for 48 hours

Specifications

Dust

• Designed to meet MIL-STD-810C, method 510.1, procedure I

• Exposure to a dust concentration of 0.3 grams/cubic ft at a

velocity of 1,750 fprn, for 12 hours

Vibration

• Designed to meet MIL-STD-810C, method 514.2, procedure

VIII

• Vibration at an acceleration of 1.1 g within the frequency range

of 5-30 Hz and an acceleration of 3 g within the frequency
range 30-500 Hz

Mechanical
shock

• Designed to meet MIL-STD-810C, method 516.2, procedure I

• Mechanical shock of 30 g half-sine wave for 11 msec

Electromagnetic Compatibility (EMC)Table A-5:

Test standard Level per

Electrostatic discharge (ESD) IEC 61000-4-2 IEC 61326-3

Radiated EM field IEC 61000-4-3 IEC 61326-3

Electrical fast transients IEC 61000-4-4 IEC 61326-3

Surge IEC 61000-4-5 IEC 61326-3

Conducted disturbances IEC 61000-4-6 IEC 61326-3

Power frequency magnetic
field

Radiated emission IEC 61000-6-3 EN 550022

Conducted emission IEC 61000-6-3 EN 550022

Immunity to main supply volt­age variations

IEC 61000-4-8 IEC 61326-3

MIL-STD-1275B

To fully comply with EMC directive 2014/30/EU and protect against interference caused by
RFI and EMI, the cable to the detector must be shielded, and the detector must be
grounded. The shield should be grounded at the detector end.

44 Rosemount 975UF

Appendix B
Wiring instructions

B.1 General instructions for electrical wiring

Follow the instructions detailed in this section for determining the correct wire gauge to
be used for this installation.

1. Use Table B-1 to determine the required wire gauge/size for general wiring, such as
relay wiring. Calculate the permitted voltage drop with respect to load current, wire
gauge, and length of wires.

Maximum DC Resistance at 68 °F (20 °C) for Copper WireTable B-1:

Wiring instructions

AWG # mm

26 0.12 - 0.15 4.32 14.15

24 0.16 - 0.24 3.42 11.22

22 0.30 - 0.38 1.71 5.60

20 0.52 - 0.61 1.07 3.50

18 0.81 - 0.96 0.67 2.20

16 1.22 - 1.43 0.43 1.40

14 1.94 - 2.28 0.27 0.88

2. Use Table B-2 to select wire gauge for power supply wires. Do not connect any circuit
or load to detectors' supply inputs.

• Select number of detectors connected in one circuit.

• Select wiring length per your installation requirements.

• Refer to power supply range for voltage extreme applied.

2

Ohm per 100 ft. Ohm per 100 m

Reference Manual 45

Wiring instructions

Wiring Length in Meters (Feet)Table B-2:

Number of de­tectors Recommended wire diameter (AWG)

24 18 16 14 N/A N/A 22-32

20 18 16 14 N/A N/A 22-32

16 20 18 16 14 N/A 22-32

12 20 18 16 14 N/A 20-32

8 20 18 16 14 N/A 20-32

4 and less 20 18 16 16 14 20-32

m (ft) 50 (164) 100 (328) 150 (492) 200 (656) 240 (820)

Max. length from power supply to last detector

Power supply
range (Vdc)

B.1.1 Calculation formula

Use the following formula to calculate minimum wire gauge per wire length between the
power supply (controller) and the detector, considering the number of detectors on the
same power line, where:

L = Actual wire length between the detector and the power supply.

N = Number of detectors per loop.

R = Resistance of wire per 100 m (see Table B-2).

V = Voltage drop on the wire.

Calculate the voltage drop on the wire as follows:

20 + V = Minimum required voltage of the power supply.

0.2 A is the maximum power consumption of the detector.

For example:

If N = 1 (1 detector in loop), L = 1,000 m, wire size = 1.5 mm2 (see Table B-1, the resistance
per 100 m for 1.5 mm2 is 1.4 Ω).

You calculate the voltage drop in the wire as follows:

The minimum voltage of the power supply should be 20 V + 5.6 V = 25.6 V

46 Rosemount 975UF

B.2 Typical wiring configurations

This section describes examples of typical wiring configurations.

Wiring terminalsFigure B-1:

Wiring instructions

Wiring ConnectionsTable B-3:

Output configu­ration Detector model Terminals

3 5 8 9

1A 975UF-1AXXXXX Analog output Fault relay (N.C.) 0-20 mA (sink) 0-20 mA (sink)

2A 975UF-2AXXXXX Analog output Fault relay (N.C.) Alarm relay (N.C.) 0-20 mA (source)

3A 975UF-3AXXXXX Analog output Fault relay (N.O.) Alarm relay (N.C.) 0-20 mA (source)

Reference Manual 47

Wiring instructions

Wiring Connections (continued)Table B-3:

Output configu­ration Detector model Terminals

1R 975UF-1RXXXXX Analog output Fault relay (N.C.) Auxiliary relay

(N.O.)

2R 975UF-2RXXXXX Analog output Fault relay (N.O.) Auxiliary relay

(N.O.)

Auxiliary relay
(N.O.)

Auxiliary relay
(N.O.)

Figure B-2:

Typical Wiring for 4 Wire Controllers (Using Output Configuration 1A or
2A)

48 Rosemount 975UF

Wiring instructions

0-20 mA Output Configuration 1A (Sink 4 Wire) - DefaultFigure B-3:

0-20 mA Output Configuration 1A (Converted to Source 3-Wire)Figure B-4:

Reference Manual 49

Wiring instructions

0 - 20 mA Output Configuration 1A (Non-Isolated Sink 3-Wire)Figure B-5:

Figure B-6:

0- 20 mA Output Configurations 2A and 3A (Source 3-Wire Available with
HART® Protocol)

50 Rosemount 975UF

NOTICE

There are no 0-20 mA outputs in output configurations 1R and 2R.

Wiring instructions

Reference Manual 51

Wiring instructions

52 Rosemount 975UF

Appendix C
RS-485 communication network

C.1 RS-485 overview

By using the RS-485 network capability of the UV/IR detector and additional software, it is
possible to connect up to thirty-two detectors in an addressable system with four (4) wires
only (two for power and two for communication). Using repeaters, the number of
detectors can be much larger (thirty-two detectors for each repeater) up to 247 on the
same four (4) wires. When using the RS-485 network, it is possible to read each detector
status (Fault, Warning, and Alarm) and to initiate a built-in test to each detector individually.

For more details, consult Rosemount.

RS-485 NetworkingFigure C-1:

RS-485 communication network

Reference Manual 53

RS-485 communication network

54 Rosemount 975UF

Appendix D
Accessories

This appendix describes the accessories that can help you maximize fire detection with the
UV/IR Flame Detector.

D.1 Flame simulator - FS-UVIR-975

The flame simulator (FS-UVIR-975) is designed specifically for use with Rosemount™ UV/IR
flame detectors. The flame simulator includes a halogen lamp that emits UV and IR energy.
This energy is accumulated by a reflector directed towards the detector. This allows the
UV/IR detectors to be tested under simulated fire conditions without the associated risks
of an open flame.

Accessories

Flame Simulator - FS-UVIR-975Figure D-1:

Reference Manual 55

Accessories

D.1.1 Ordering information

The PN of the flame simulator kit is 00975-9000-0010. The kit is supplied in a carry case
that includes:

• Flame simulator (FS-UVIR-975)

• Charger

• Tool kit

• Technical manual

D.1.2 Unpacking

Verify that you have received the following contents:

• Delivery form

• Flame simulator with integral battery

• User manual

• Factory acceptance test forms

• EC declaration

• Storage case

D.1.3

Operating instructions

Complete the following steps to simulate a fire.

WARNING!

HAZARDOUS AREA
Do not open the flame simulator to charge the batteries or for any other reason in a hazardous
area.

CAUTION!

EQUIPMENT DAMAGE

The following test simulates a real fire condition and may activate the extinguishing system of
other alarms. If this is not desired, disconnect/inhibit them before the test and reconnect after
the simulation.

Procedure

1. Make sure that you are at the correct distance from the detector according to the
type of detector and the detector sensitivity.

2. Aim the detector using the mechanical sight at the center of the detector. Activate
the button and adjust the spot at the center of the detector.

56 Rosemount 975UF

Accessories

Rosemount 975UF Detector Target PointFigure D-2:

3. Keep the simulator aimed at the detector for up to 50 seconds until you receive an
alarm.

4. Wait twenty seconds before repeating the test.

D.1.4

Reference Manual 57

Range

Sensitivity RangesTable D-1:

Detector sensitivity settings Maximum testing distance

65.6 ft. (20 m) 23 ft. (7 m)

1. The minimum distance from the detector is 2.5 ft. (0.75 m).

2. At extreme temperatures, there is a 15 percent maximum reduction in the range.

Accessories

NOTICE

Keep the flame simulator in a safe place when not in use.

D.1.5 Charging the battery

The flame simulator uses lithium ion batteries as a rechargeable power source. When the
batteries are fully charged, the simulator operates for at least 100 times without having to
be recharged. The simulator will not operate when the voltage from the batteries is lower
than the required operational level.

Flame Simulator Battery ReplacementFigure D-3:

A. Simulator
B. Battery pack
C. Locking disc
D. Back cover

To charge the battery:

NOTICE

The item letters in this procedure can all be found in Figure D-3.

Procedure

1. Place the flame simulator in a safe area, not exceeding 104 °F (40 °C).

2. Release the locking screw.

3. Unscrew the battery back cover (D) counter-clockwise.

4. Unscrew the locking disc (C) clockwise.

5. Pull out the battery from the flame simulator.

6. Connect the battery to the charger.

58 Rosemount 975UF

7. Charge for a maximum of two to three hours.

8. Disconnect the charger.

9. Insert the battery in the flame simulator.

10. Screw on the locking disc (C).

11. Screw on the back cover (D).

12. Lock the back cover with the locking screw.

D.1.6 Battery replacement

To replace the battery:

NOTICE

The item letters shown in this procedure can all be found in Figure D-3.

Procedure

1. Place the flame simulator on a table in a safe area, not exceeding 104 °F (40 °C).

2. Release the locking screw.

3. Unscrew the battery back cover (D) counter-clockwise.

4. Unscrew the locking disk (C) clockwise.

5. Pull out the battery from the flame simulator.

6. Insert the new battery pack in the simulator housing. Use only Rosemount battery
pack, PN 00975-9000-0012.

7. Screw on the locking disc (C).

8. Screw on the back cover (D).

9. Lock the back cover with the locking screw.

Accessories

NOTICE

For more information, refer to 00809-0800-4975.

D.1.7

Reference Manual 59

Technical specifications

Flame Simulator Technical SpecificationsTable D-2:

General • 32 to 122 °F (0 to 50 °C)

• Vibration protection: 1 g (10 - 50 Hz)

Electrical • Power: 14.8 V (4 x 3.7 V rechargeable lithium battery)

• Max, current: 4 A

• Battery capacity: 2.2 AH

• Charging time: 2 A at 2 Hr

Accessories

Flame Simulator Technical Specifications (continued)Table D-2:

Physical • 9.1 x 7.3 x 5.4 in. (230 x 185 x 136 mm)

• Weight: 2.5 kg (5.5 lb)

• Enclosure: aluminum, heavy duty copper free, black zinc coating

• Explosion-proof enclosure

ATEX and IECEx

II 2 G D

Ex d ib op is IIB +H2 T5 Gb

EMI compatibility See Table D-3 and Table D-4.

Immunity TestsTable D-3:

Title Basic standard Level to be tested

Electrostatic discharge (ESD) IEC 61000-4-2 6 kv / 8 kv contact / air

Radiated electromagnetic field IEC 61000-4-3 20 V/m (80 MHz to 1 GHz)

10 V/m (1.4 GHz to 2 GHz)
3 V/m (2.0 GHz to 2.7 GHz)

Conducted disturbances IEC 61000-4-6 10 Vrms (150 kHz to 80 MHz)

Immunity to mains supply volt­age variations

MIL-STD-1275B

Emission TestsTable D-4:

Title Basic standard Level to be tested Class

Radiated emission IEC 61000-6-3 40 dbuv/m (30 MHz to

230 MHz), 47 dbuv/m
(230 MHz to 1 GHZ

D.2 Tilt mount - PN 00975-9000-0001

The tilt mount provides accurate directional selection for optimum area coverage.

Like Class B of EN
55022

60 Rosemount 975UF

Tilt MountFigure D-4:

D.3 Duct mount - PN 00975-9000-0002

Accessories

The duct mount is suitable for use with the Rosemount 975 series optical flame detector
for both the aluminum and stainless steel enclosures.

The duct mount allows flame detection in areas where high temperatures exist or in cases
where the detector cannot be installed inside the area. It comprises a special duct mount
arrangement with specific optical window to allow installation in high temperature duct
applications.

The duct mount limits the cone of vision of the installed detector to 65 ° horizontal and
65 ° vertical.

The temperature allowed for the duct mount to be installed is -67 °F to 392 °F (-55 °C to
200 °C).

For more instructions, refer to 00809-0600-4975.

Reference Manual 61

Accessories

Duct MountFigure D-5:

62 Rosemount 975UF

D.4 Cone viewer - PN 00975-9000-0006

The cone viewer evaluates detector coverage on-site. The device is an add-on accessory
that enables designers and installers to optimize detector location and assess the actual
coverage of installed detectors.

The device is universal and can be used with all Rosemount 975 optical flame detectors.

Cone ViewerFigure D-6:

Accessories

Reference Manual 63

Accessories

D.5 Air shield - PN 00975-9000-0005

The air shield is suitable for use with the Rosemount 975 series flame detectors for both
the aluminum and stainless steel enclosures.

Optical flame detectors are often used in highly polluted or dirty areas that force
maintenance personnel to access the detector frequently to clean its optical window. The
special air shield, developed for 975 series optical flame detectors, allows their installation
under tough environmental conditions where they may be exposed to oil vapors, sand,
dust, and other particulate matter.

The temperature of the air supply to the air shield should not exceed 140 °F (60 °C) at any
time.

Air pressure source: clean, dry, and oil-free air

Pressure: 2 - 3 bar (30 - 45 psi)

Fitting: 7/16 in. - 20 UNF - 2 A

Operation temperature: -55 °C to 85 °C (-67 °F to 185 °F)

For more instructions, refer to 00809-0700-4975.

Air ShieldFigure D-7:

64 Rosemount 975UF

Appendix E
SIL-2 features

E.1 Rosemount 975UF Ultra Fast Ultraviolet

Infrared Flame Detector

This appendix details the special conditions to comply with the requirements of EN 61508
for SIL 2.

The Rosemount 975UF Flame Detector can only be used in low or high demand mode
applications; see IEC 61508.4, Chapter 3.5.12.

E.1.1 Safety relevant parameters

SIL-2 features

E.1.2

Perform the following functional checks of the detector every thirty days.

• HFT: 0

• PFD: 1.9 x 10-4 (≈ 2% of SIL-2) if only alarm relay is used for alerting.

• PFD: 1.9 x 10-4 (≈ 2% of SIL-2) if 0-20 mA - interface is used as alarm.

• SFF: 97% fulfills the conditions of EN 61508 for SIL2.

Guidelines for configuring, installing, operating, and
service.

The alert conditions according to SIL-2 can be implemented by an:

• Alert signal via 20 mA current loop

or

• Alert signal via alarm relay and the fault relay

Conditions for safe operating

1. The flame detector shall consist only of the approved hardware and software
modules.

2. The 24 V power supply must fulfill the requirements for PELV/SELV of EN 60950.

3. The automatic BIT (built-in test) must be activated.

4. The setup parameters must be verified (as described in

Using the 0-20 mA interface for alerting and Using the alarm relay contact for alerting),

and the function of the 975 flame detector (flame detection, function of the 0-20
mA interface, relay functions) must be checked completely.

Reference Manual 65

SIL-2 features

Using the 0-20 mA interface for alerting

The following parameters shall be set:

• Automatic built-in test = ON

• Connected to 0-20 ma terminals

The following allowed output current must be supervised with an accuracy of ±5%.

• Normal state = 4 mA

• Warning state = 16 mA

• Alarm state = 20 mA

The output current must be supervised regarding the over-and under run of the 0-20 mA.

Using the alarm relay contact for alerting

The following parameters shall be set:

• Automatic built-in-test = ON

• Connected to N.C. contact of alarm relay terminals

• Connected to fault relay terminals

The relay contacts (alarm and faulty relay) must be protected with a fuse rated at 0.6 of the
nominal specified relay contact current.

The maximum contact rating that is allowed per SIL-2 is 30 Vdc.

The contact of the alarm relay opens if there is a fire alarm.

During the forwarding and evaluation of the alarm, the relay contact opens.

Other

1. The complete function of the flame detector (flame detection, function of the
0-20 mA interface, and the relays) must be examined at least every six or twelve
months (see Section E.1.1 ) when the flame detector must be switched OFF and ON.

2. The window of the sensor must be examined at appropriate time intervals for partial
contamination.

3. The HART® and the RS-485 interfaces must not be used for the transmission of the
safety-related data.

66 Rosemount 975UF

SIL-2 features

Reference Manual 67

00809-0100-4977

Rev E
2018

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