Emerson Rosemount 975UF Reference Manual
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Emerson Rosemount 975UF Reference Manual

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Reference Manual
00809-0100-4977, Rev DC
June 2021
™
Rosemount
975UF
Ultra Fast Ultraviolet Infrared Flame Detector

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  • Page 1 Reference Manual 00809-0100-4977, Rev DC June 2021 ™ Rosemount 975UF Ultra Fast Ultraviolet Infrared Flame Detector...
  • Page 2 Emerson does not assume any liability arising out of the application or any use of any product or circuit described herein;...
  • Page 3 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. Ship all equipment prepaid. Emerson will not accept collect shipments. Abbreviations and acronyms Abbreviation or acronym...
  • Page 4 Abbreviation or acronym Definition Infrared Type of jet fuel Latching Refers to relays remaining in the ON state even after the ON condition has been removed. Light emitting diode Liquified petroleum gas Milliamps (0.001 amps) ® Modbus Master-slave messaging structure N.C.

  • Page 5: Table Of Contents

    A.4 Mechanical specifications......................52 A.5 Environmental specifications.....................53 Appendix B Wiring instructions....................55 B.1 General instructions for electrical wiring..................55 B.2 Typical wiring configurations..................... 57 Appendix C RS-485 communication network................63 Appendix D Accessories......................65 D.1 Flame simulator........................65 Rosemount 975UF...
  • Page 6 D.3 Duct mount..........................71 D.4 Cone viewer - PN 00975-9000-0006..................72 D.5 Air shield: PN 00975-9000-0005....................73 Appendix E SIL-2 features......................75 E.1 Safety relevant parameters......................75 E.2 Guidelines for configuring, installing, operating, and service............. 75 Appendix F End of line resistor....................77 Emerson.com/Rosemount...

  • Page 7: Chapter 1 Introduction

    Introduction Overview The Rosemount Rosemount 975UF ultra fast Ultraviolet Infrared Flame Detector senses radiant energy in the shortwave section of both the ultraviolet and infrared portions of the electromagnetic spectrum. The IR sensor operates at a wavelength of 2.5 to 3.0 µm, giving the flame detector the ability to detect hydrocarbon-based fuel and gas, hydroxyl, and hydrogen fires, as well as metal and inorganic fires.

  • Page 8: Ordering Information

    Introduction Reference Manual June 2021 00809-0100-4977 Ordering information The Rosemount 975UF is provided in various configurations depending on: • Output configurations • Temperature • Housing style • Product certifications The configuration detail is included in the product part number on the product label and takes the form: Rosemount 975UF-XXXXXXX, where XXXXXXX defines the model according to the above requirements.
  • Page 9 185 °F (85 °C) 1.2.6 Product certifications Code Description ★ ATEX and IECEx flameproof ★ FM and CSA flameproof ★ InMetro flameproof ★ Technical Regulations Customs Union (EAC) flameproof 1.2.7 Spare parts and accessories Part number Description ★ 00975-9000-0001 Tilt mount Rosemount 975UF...
  • Page 10 ★ 00975-9000-0007 2-in. (50.8 mm) pipe mount ★ 00975-9000-0008 3-in. (76.2 mm) pipe mount ★ 00975-9000-0010 Flame simulator kit (for Rosemount 975UF and 975UR) ★ 00975-9000-0011 USB RS-485 harness kit ★ 00975-9000-0012 Spare battery pack for use with flame simulator ★...

  • Page 11: Features And Benefits

    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.
  • Page 12 June 2021 00809-0100-4977 Sensing elements The IR sensor in the Rosemount Rosemount 975UF is sensitive to radiation over the range of 2.5 to 3.0 microns, where the H 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.
  • Page 13 Ex tb op is IIIC T96 °C Db (-55 °C ≤ Ta ≤ +75 °C) 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) Rosemount 975UF...
  • Page 14 ABNT NBR IEC 60079-0 • ABNT NBRIEC 60079-1 • ABNT NBR IEC 60079-7 • ABNT NBR IEC 60079-18 • ABNT NBR IEC 60079-31 • INMETRO decree No. 179 For further details, see the Certificate of Compliance No. UL-BR 16.065XX. Emerson.com/Rosemount...

  • Page 15: Performance Considerations

    The detection distance for the Warning level is approximately 10 percent higher than the distance. Alarm For some typical ambient conditions, the Zeta parameter as defined in NFPA 72 for the detector is 0.005 (1/meter). Note Zeta parameters may vary significantly with changes in temperature, air pressure, humidity, visibility conditions, etc. Rosemount 975UF...
  • Page 16 16 / 5 Silane 6 / 1.8 30 in. (0.75 m) high, 10 in. (0.25 m) wide plume fire 20 in. (0.5 m) high, 8 in. (0.2 m) wide plume fire 1.5.2 Cone of vision • Horizontal: 100 ° Emerson.com/Rosemount...
  • Page 17 Reference Manual Introduction 00809-0100-4977 June 2021 Figure 1-1: Horizontal Field of View • Vertical: +50 ° (down), -40 ° (up) Rosemount 975UF...
  • Page 18 Introduction Reference Manual June 2021 00809-0100-4977 Figure 1-2: Vertical Field of View Emerson.com/Rosemount...
  • Page 19 Quartz lamp (1,000 W) 12 (4) Mercury vapor lamp Grinding metal 3.3 (1) Lit cigar Lit cigarette Match, wood, stick, including flare up 3.3 (1) 1. IAD: Immune at any distance. 2. All sources are chopped from 0 to 20 Hz. Rosemount 975UF...
  • Page 20 Output signals Outputs are available according to the default configuration or the wiring options selected for the detector. Determine the outputs of your model according to Table 1-4. The detector incorporates several types of output suitable to different control systems. Emerson.com/Rosemount...
  • Page 21 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. Rosemount 975UF...
  • Page 22 If selected, upon detection of a fire, the detection signal is latched until the operator manually resets the detector by 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. Emerson.com/Rosemount...

  • Page 23: Internal Detector Tests

    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 • LED - yellow flashes (4 Hz) • Correcting the fault Rosemount 975UF...
  • Page 24 Fault relay • Output configurations 1A, 2A, and 1R: remain 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) Emerson.com/Rosemount...
  • Page 25 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 Rosemount 975UF...
  • Page 26 Introduction Reference Manual June 2021 00809-0100-4977 Emerson.com/Rosemount...

  • Page 27: Installing The Detector

    Take into account all conceivable considerations regarding detection location before starting an installation. Installations must comply with National Fire Protection Agency (NFPA) 72E or any other local and international regulations and standards, as applicable to flame detectors and installation of Ex approved products. Rosemount 975UF...

  • Page 28: Unpack

    Mount the detector on the tilt Part of the kit mount. Flat screwdriver 6 mm Connect ground terminal. Standard tool Flat screwdriver 2.5 mm Connect wires to the terminal Standard tool blocks. Hex key 5/16-in. Scrw detector plug. Part of the kit Emerson.com/Rosemount...

  • Page 29: Certification Instructions

    — Suitable precautions: regular checks as part of routine inspections or establishing from the material's data sheets that it is resistant to specific chemicals. Refer to Product certifications for more information about product certifications. Rosemount 975UF...

  • Page 30: Installing Cables

    After pulling the conductor cables through the conduits, perform a continuity test. Installing the tilt mount (PN 00975-9000-0001) The tilt mount (PN 00975-9000-0001) enables the detector to rotate up to 60 degrees in all directions. Figure 2-1 shows the detector mounted on the tilt mount. Emerson.com/Rosemount...
  • Page 31 Figure 2-1: Detector with Tilt Mount 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 Rosemount 975UF...
  • Page 32 Installing the detector Reference Manual June 2021 00809-0100-4977 2.6.1 Assemble the tilt mount Figure 2-2: Tilt Mount Assembly A. Tilt holding plate B. Tilt mount C. Horizontal locking screw D. Vertical locking screw E. Detector holding plate Emerson.com/Rosemount...
  • Page 33 Secure the detector in position by tightening the locking screws on the tilt mount. The detector is now correctly located, aligned, and ready to be connected to the system. Rosemount 975UF...

  • Page 34: Connect The Detector

    4. Use a ¾-in. - 14 national pipe thread (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 Table 2-2. Emerson.com/Rosemount...
  • Page 35 A. Terminal chamber B. Terminals C. Internal earth terminal D. Earth terminal E. Detector holding screw F. Conduit/cable entry G. See Table 2-2. H. Alarm relay (C) I. Alarm relay (normally open) J. Fault relay (C) K. Analog output Rosemount 975UF...
  • Page 36 There are twelve terminals labeled 1 - 12. For more information on the output configurations, see Wiring instructions. Table 2-2 describes the function of each terminal for all the output configurations. Table 2-2: Rosemount 975UF Output Configurations Wire terminal 1A (default) number +24 Vdc +24 Vdc...

  • Page 37: Configure The Detector

    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 Rosemount 975UF...
  • Page 38 Only available in output configurations 1R and 2R. 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). Emerson.com/Rosemount...
  • Page 39 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). Rosemount 975UF...
  • Page 40 Installing the detector Reference Manual June 2021 00809-0100-4977 Emerson.com/Rosemount...

  • Page 41: Operating The Detector

    Do not open the detector housing while power is applied. • Do not open the electronic compartment. Keep this part closed at all times. It can only be opened in the factory. Opening the electronic component side invalidates the warranty. Rosemount 975UF...

  • Page 42: Testing Procedures

    Test the detector using the flame simulator. The detector performs the internal test continuously and the automatic built-in test every fifteen minutes; for more details, refer to Built-in test (BIT) 3.3.1 Automatic built-in test Check that the indicators show normal conditions. Power Emerson.com/Rosemount...
  • Page 43 Activated For a few seconds and then returns to Normal Auxiliary relay Activated For a few seconds and then returns to Normal Fault relay Remains active during the test Red, steady The detector is now ready for operation. Rosemount 975UF...
  • Page 44 Operating the detector Reference Manual June 2021 00809-0100-4977 Emerson.com/Rosemount...

  • Page 45: 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 Emerson or its authorized distributer for assistance. Maintenance This section describes the basic maintenance steps you should take to keep the detector in good working condition.

  • Page 46: Troubleshooting

    • Entries for every maintenance operation performed, including the description of the operation, date, and personnel ID If you send a unit to Emerson or a distributer for service, include a copy of the maintenance records. Troubleshooting This section is intended to be a guide to correct problems that may happen during normal operation.
  • Page 47 Reset the detector. 4.2.5 Alarm relay at on 0-20 mA at 20 mA Potential cause Alarm condition Recommended actions 1. Check cause of alarm. 2. If no alarm, re-power the detector. 3. Send the detector back for repairs. Rosemount 975UF...
  • Page 48 Maintenance and troubleshooting Reference Manual June 2021 00809-0100-4977 Emerson.com/Rosemount...

  • Page 49: Appendix A Specifications And Reference Data

    Normal 1.61 W 1.56 W (max. 24 Vdc) Normal when heater 2.28 W 2.16 W Alarm 2.64 W 2.28 W Alarm when heater on 3.24 W 2.88 W Maximum current Normal 70 mA 65 mA (max. 24 Vdc) Rosemount 975UF...

  • Page 50: Outputs

    (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.) • Output configuration 2R: power, RS-485, analog output, fault relay (N.O.), auxiliary relay (N.O.), alarm relay (N.O.) Emerson.com/Rosemount...
  • Page 51 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. Through the HART protocol, the detector can: — Display setup. — Reconfigure the setup. Rosemount 975UF...

  • Page 52: Mechanical Specifications

    ¾-in. -14 national pipe thread (NPT) conduit or Electrical connection • (two entries) • M25 x 1.5 Dimensions 4 x 4.6 x 6.18 in. (101.6 x 117 x 157 mm) Weight Stainless steel: 6.1 lb. (2.8 kg) Aluminum: 2.8 lb. (1.3 kg) Emerson.com/Rosemount...

  • Page 53: Environmental Specifications

    Reference Manual Specifications and reference data 00809-0100-4977 June 2021 Environmental specifications The Rosemount 975UF is designed to withstand harsh environmental conditions. High temperature • Designed to meet DNVGL-CG-0339, class D • Operating temperature: +167 °F (+75 °C) • Storage temperature: +185 °F (+85 °C) Low temperature •...
  • Page 54 Specifications and reference data Reference Manual June 2021 00809-0100-4977 Emerson.com/Rosemount...

  • Page 55: Appendix B Wiring Instructions

    Recommended wire diameter (AWG) Power supply detectors range (Vdc) 22-32 22-32 22-32 20-32 20-32 4 and less 20-32 m (ft) 50 (164) 100 (328) 150 (492) 200 (656) 240 (820) Max. length from power supply to last detector Rosemount 975UF...
  • Page 56 B-1, the resistance per 100 m for 1.5 mm 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. Emerson.com/Rosemount...

  • Page 57: Typical Wiring Configurations

    A. See table. B. Alarm relay (C) C. Ground D. Alarm relay: normally open (N.O.) E. Fault relay (C) Table B-3: Wiring Connections Output Detector model Terminals configuration 975UF-1AXXXXX Analog output Fault relay (N.C.) 0-20 mA (sink) 0-20 mA (sink) Rosemount 975UF...
  • Page 58 Auxiliary relay (N.O.) (N.O.) Figure B-2: Typical Wiring for Four-Wire Controllers (Using Output Configuration 1A or 2A) A. Controller B. First detector C. Second detector D. Last detector E. Power supply F. Alarm loop G. End of line (EOL) Emerson.com/Rosemount...
  • Page 59 Reference Manual Wiring instructions 00809-0100-4977 June 2021 Figure B-3: 0-20 mA Output Configuration 1A (Sink 4-Wire) - Default A. Detector B. Controller C. Input power 18-32 Vdc D. Return E. 0-20 mA meter Rosemount 975UF...
  • Page 60 Wiring instructions Reference Manual June 2021 00809-0100-4977 Figure B-4: 0-20 mA Output Configuration 1A (Converted to Source Three-Wire) A. Detector B. Controller C. Input power 18-32 Vdc D. Return E. 0-20 mA meter Emerson.com/Rosemount...
  • Page 61 Reference Manual Wiring instructions 00809-0100-4977 June 2021 Figure B-5: 0 - 20 mA Output Configuration 1A (Non-Isolated Sink Three-Wire) A. Detector B. Controller C. Input power 18-32 Vdc D. Return E. 0-20 mA meter Rosemount 975UF...
  • Page 62 Figure B-6: 0-20 mA Output Configurations 2A and 3A (Source Three-Wire Available ® with HART Protocol) A. Detector B. Controller C. Input power 18-32 Vdc D. Return E. 0-20 mA meter NOTICE There are no 0-20 mA outputs in output configurations 1R and 2R. Emerson.com/Rosemount...

  • Page 63: Appendix Crs-485 Communication Network

    RS-485 network, you can read each detector status (Fault, Warning, and Alarm) and to initiate a built-in test to each detector individually. For more details, consult Rosemount. Figure C-1: RS-485 Networking A. Controller B. Detector C. Power supply D. RS-485 computer port Rosemount 975UF...
  • Page 64 RS-485 communication network Reference Manual June 2021 00809-0100-4977 Emerson.com/Rosemount...

  • Page 65: Appendix D Accessories

    Rosemount 975UF flame detector. Flame simulator Emerson designed the flame simulators specifically for use with Rosemount 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 detectors to be tested under simulated fire conditions without the associated risks of an open flame.
  • Page 66 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. Emerson.com/Rosemount...
  • Page 67 Reference Manual Accessories 00809-0100-4977 June 2021 Figure D-2: Rosemount Rosemount 975UF Detector Target Point A. Detector target point 3. Keep the simulator aimed at the detector for up to 50 seconds until you receive an alarm. 4. Wait 20 seconds before repeating the test.
  • Page 68 4. Unscrew the locking disc (C) clockwise. 5. Pull out the battery from the flame simulator. 6. Connect the battery to the charger. 7. Charge for a maximum of two to three hours. 8. Disconnect the charger. 9. Insert the battery in the flame simulator. Emerson.com/Rosemount...
  • Page 69 Rechargeable four cell lithium-ion battery: — Power: 14.8 V (4 x 3.7 V), maximum current: 0.2 A — Charging: 16.8 V (4 x 4.2 V), maximum current: 4 A • Battery capacity: 2.6 Ah • Charging time: Two hours at 2 A Rosemount 975UF...
  • Page 70 Immunity to mains supply MIL-STD-1275B voltage variations Table D-4: Emission Tests Title Basic standard Level to be tested Class Radiated emission IEC 61000-6-3 40 dbuv/m (30 MHz to Like Class B of 230 MHz) EN55022 47 dbuv/m (230 MHz to 1 GHZ) Emerson.com/Rosemount...

  • Page 71: Tilt Mount: Pn 00975-9000-0001

    The tilt mount provides accurate directional selection for optimum area coverage. Figure D-4: Tilt Mount Duct mount The duct mount limits the cone of vision of the installed detector to 70 degrees horizontal and vertical. For more instructions, refer to the Duct Mount Manual (00809-0600-4975). Rosemount 975UF...

  • Page 72: 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. Figure D-5: Cone Viewer Emerson.com/Rosemount...

  • Page 73: Air Shield: Pn 00975-9000-0005

    Tube outside diameter: ¼-in. national pipe thread (NPT)/6 mm Connecting adapter size: 7/16-in. NPT Operation temperature: -67 to 185 °F (-55 to 85 °C) For more instructions, refer to the Rosemount 975 Air Shield Manual (00809-0700-4975). Figure D-6: Rosemount 975 Air Shield Rosemount 975UF...
  • Page 74 Accessories Reference Manual June 2021 00809-0100-4977 Emerson.com/Rosemount...

  • Page 75: Appendix Esil-2 Features

    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. Safety relevant parameters Perform the following functional checks of the detector every thirty days.
  • Page 76 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. Emerson.com/Rosemount...

  • Page 77: Appendix F End Of Line Resistor

    When the resistor is assembled, the rear part can be used as Ex d only. To meet the allowed power consumption, the total resistance should be higher than 1.5 KΩ. Figure F-1: Rosemount 975UF Flame Detector A. Terminal number 5 B. Terminal number 6 C.
  • Page 78 2021 Emerson. All rights reserved. Emerson Terms and Conditions of Sale are available upon request. The Emerson logo is a trademark and service mark of Emerson Electric Co. Rosemount is a mark of one of the Emerson family of companies. All other marks are the property...

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