Emerson Rosemount 975MR Reference Manual
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Emerson Rosemount 975MR Reference Manual

Multi-spectrum infrared flame detector
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Reference Manual
00809-0100-4975, Rev DB
August 2019
™
Rosemount
975MR
Multi-Spectrum Infrared Flame Detector

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Summary of Contents for Emerson Rosemount 975MR

  • Page 1 Reference Manual 00809-0100-4975, Rev DB August 2019 ™ Rosemount 975MR Multi-Spectrum Infrared Flame Detector...
  • Page 2 Legal notice The device 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 from Rosemount.
  • 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 Milliamps (0.001 amps) ® Modbus Master-slave messaging structure N.C. Normally closed N .O. Normally open Not applicable NFPA National Fire Protection Association National pipe thread Part number Safety integrity level Unified coarse thread Volts alternating current Volts direct current...

  • Page 5: Table Of Contents

    A.5 Environmental specifications......................50 Appendix B Wiring instructions...................... 53 B.1 General instructions for electrical wiring..................53 B.2 Typical wiring configurations......................55 Appendix C RS-485 communication network.................. 59 Appendix D Accessories........................61 D.1 Flame simulator..........................61 D.2 Tilt mount: PN 00975-9000-0001....................66 Rosemount 975MR...
  • Page 6 D.3 Duct mount: PN 00975-9000-0002....................66 D.4 Weather cover: PN 00975-9000-0003....................68 D.5 Air shield: PN 00975-9000-0005....................69 Appendix E SIL-2 features....................... 71 E.1 Safety relevant parameters......................71 E.2 Guidelines for configuring, installing, operating, and service............71 Appendix F End of line resistor......................73 Emerson.com/Rosemount...

  • Page 7: Chapter 1 Introduction

    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 975MR is provided in various configurations depending on: • Output configurations •...
  • Page 8 Normally closed Normally open Normally open (fault, alarm, auxiliary) ★ RS-485/relays Normally open Normally open Normally open (fault, alarm, auxiliary) Housing style Material Conduit entry ★ ¾-in. NPT Aluminum ★ Aluminum ★ Stainless steel ¾-in. NPT ★ Stainless steel Emerson.com/Rosemount...
  • Page 9 Air shield ★ 00975-9000-0007 2-in. (50,8 mm) pipe mount ★ 00975-9000-0008 3-in. (76,2 mm) pipe mount ★ 00975-9000-0009 Flame simulator kit (for Rosemount 975MR) ★ 00975-9000-0011 USB RS-485 harness kit ★ 00975-9000-0012 Spare battery pack for use with flame simulator ★...

  • Page 10: Features And Benefits

    Built-in-test (BIT): manual and automatic (see Built-in test (BIT)). • 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 HART protocol). Emerson.com/Rosemount...

  • Page 11: Principles Of Operation

    1.4.1 Hydrocarbon fire detection The Rosemount 975MR uses four infrared sensors, each sensitive to its own wavelength range. Two of the sensors are sensitive to wavelengths within the emission peak of hot . The other two sensors are sensitive to wavelengths above and below this peak.
  • Page 12 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. Emerson.com/Rosemount...
  • Page 13 The flame detector is in compliance with the following standards as of May 18, 2010: • 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 Rosemount 975MR...

  • Page 14: Performance Considerations

    Alarm response times for a standard fire at a specified range are shown in Table 1-4. Table 1-4: Sensitivity Range Levels Level Response time (sec) Sensitivity range - ft. (m) (for 1 ft. (0.1 m ) n-heptane pan fire) 50 (15) 2 default 100 (30) Emerson.com/Rosemount...
  • Page 15 Ethanol 95% 135 / 40 135 / 40 Methanol 115 / 35 Methane 150 / 45 150 / 45 Paper 82 / 25 Polypropylene 115 / 35 30 in. (0.75 m) high, 10 in. (0.25 m) wide plume fire Rosemount 975MR...
  • Page 16 Introduction Reference Manual August 2019 00809-0100-4975 1.5.2 Cone of vision • Horizontal: 100 ° Figure 1-1: Horizontal Field of View • Vertical: +50 ° (down), -45 ° (up) Emerson.com/Rosemount...
  • Page 17 Radiation source Immunity distance ft. (m) Indirect or reflected sunlight Vehicle headlights (low beam) conforming to MS53023-1 Incandescent frosted glass light, 300 W Fluorescent light with white enamel reflector, standard office or shop, 70 W (or two 35 W) Rosemount 975MR...
  • Page 18 > 17 ft. (6 m) 215 ft. (65 m) >25 ft. (7.5 m) 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 1-8. Emerson.com/Rosemount...
  • Page 19 Determine the outputs of your model according to Table 1-9. 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 Rosemount 975MR...
  • Page 20 A fault is detected when the power supply is too low or due to a software 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 1-11. Emerson.com/Rosemount...

  • Page 21: Internal Detector Tests

    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. Internal detector tests The detector performs two types of self-tests: • Continuous feature test Rosemount 975MR...
  • Page 22 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 in the following modes: • Automatically and manually • Manually only Emerson.com/Rosemount...
  • Page 23 • 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 Rosemount 975MR...
  • Page 24 Output configurations 1A, 2A, and 3A: indicates BIT Fault (2 mA) Power LED Yellow, flashing, 4 Hz Manual built-in test only selected The built-in test is initiated manually by momentarily selecting Terminal Number 3 with Terminal Number 2 or a switch across these terminals in a safe area. Emerson.com/Rosemount...

  • Page 25: Installing The Detector

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

  • Page 26: Unpack

    Part of the kit cover (for wiring). Hex key ¼-in. 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. Emerson.com/Rosemount...

  • Page 27: 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 975MR...

  • Page 28: 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 29 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 975MR...
  • Page 30 Installing the detector Reference Manual August 2019 00809-0100-4975 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 31 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 975MR...

  • Page 32: Connect The Detector

    4. Use a ¾-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 Table 2-2. Emerson.com/Rosemount...
  • Page 33 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. Manual BIT Rosemount 975MR...
  • Page 34 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 975MR Output Configurations Wire terminal 1A (default) number +24 Vdc +24 Vdc...

  • Page 35: Configure The Detector

    These functions enable you to set: • Sensitivity • Alarm delay • Address setup • Mode of operation • Heated optics operation The factory default settings listed for each function are: • Sensitivity: 30 • Alarm delay: A • Alarm latch: No Rosemount 975MR...
  • Page 36 No: Disable alarm latching (default). 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 37 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 975MR...
  • Page 38 Installing the detector Reference Manual August 2019 00809-0100-4975 Emerson.com/Rosemount...

  • Page 39: 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 975MR...

  • Page 40: Testing Procedures

    Test the detector using the manual built-in test (BIT) or 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 41 After a few seconds, a successful test shows the results shown in Table 3-2. Table 3-2: Results of a Successful Flame Simulator Test Component Action Notes 0-20 mA Turns to 20 mA For a few seconds and then returns to 4 mA Rosemount 975MR...
  • Page 42 Alarm relay 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. Emerson.com/Rosemount...

  • Page 43: Maintenance And Troubleshooting

    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 44: Troubleshooting

    Perform a functional test of the detector as described in Internal detector tests. 4.1.3 Keeping maintenance records Emerson recommends that you record maintenance operations performed on a detector in a log book. The record should include the following: • Installation date and contractor •...
  • Page 45 Recommended action Reset the detector. 4.2.5 Alarm relay at on 0-20 mA at 20 mA 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 975MR...
  • Page 46 Maintenance and troubleshooting Reference Manual August 2019 00809-0100-4975 Emerson.com/Rosemount...

  • Page 47: Appendix A Specifications And Reference Data

    Alarm when heater on 3.24 W 2.88 W Maximum current Normal 70 mA 65 mA (max. 24 Vdc) Normal when heater 95 mA 90 mA Alarm 110 mA 95 mA Alarm when heater on 135 mA 120 mA Rosemount 975MR...

  • Page 48: Outputs

    Output configuration 2R: power, RS-485, fault relay (N.O.), auxiliary relay (N.O.), alarm relay (N.O.) Electrical • Dry contact relays outputs Table A-3: Contact Ratings Relay name Type Normal position Maximum ratings Alarm SPDT N.O., N.C. 2 A at 30 Vdc Emerson.com/Rosemount...
  • Page 49 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. Rosemount 975MR...

  • Page 50: Mechanical Specifications

    4 x 4.6 x 6.18 in. (101.6 x 117 x 157 mm) Weight 6.1 lb. (2.8 kg) Environmental specifications The Rosemount 975MR is designed to withstand harsh environmental conditions. High • Designed to meet MIL-STD-810C, method 501.1, procedure II temperature •...
  • Page 51 EN 50130-4 Conducted disturbances IEC 61000-4-6 EN 50130-4 Power frequency magnetic field IEC 61000-4-8 EN 50130-4 Radiated emission IEC 61000-6-3 EN 550022 Conducted emission IEC 61000-6-3 EN 550022 Immunity to main supply IEC 61000-4-29 EN 50130-4 voltage variations Rosemount 975MR...
  • Page 52 Specifications and reference data Reference Manual August 2019 00809-0100-4975 Emerson.com/Rosemount...

  • Page 53: 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 975MR...
  • Page 54 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 55: Typical Wiring Configurations

    0-20 mA (sink) Fault relay (N.C.) Alarm relay (N.C.) 0-20 mA (source) Fault relay (N.O.) Alarm relay (N.C.) 0-20 mA (source) Fault relay (N.C.) Auxiliary relay (N.O.) Auxiliary relay (C) Fault relay (N.O.) Auxiliary relay (N.O.) Auxiliary relay (C) Rosemount 975MR...
  • Page 56 Wiring instructions Reference Manual August 2019 00809-0100-4975 Figure B-2: Typical Wiring for 4-Wire Controllers (Using Output Configuration 1A or Figure B-3: 0-20 mA Output Configuration 1A (Sink 4-Wire) - Default Emerson.com/Rosemount...
  • Page 57 Reference Manual Wiring instructions 00809-0100-4975 August 2019 Figure B-4: 0-20 mA Output Configuration 1A (Converted to Source 3-Wire) Figure B-5: 0 - 20 mA Output Configuration 1A (Non-Isolated Sink 3-Wire) Rosemount 975MR...
  • Page 58 Wiring instructions Reference Manual August 2019 00809-0100-4975 Figure B-6: 0- 20 mA Output Configurations 2A and 3A (Source 3-Wire Available with ® HART Protocol) NOTICE There are no 0-20 mA outputs in output configurations 1R and 2R. Emerson.com/Rosemount...

  • Page 59: Appendix Crs-485 Communication Network

    (32 detectors for each repeater) up to 247 on the same four (4) wires. When using the 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 Rosemount 975MR...
  • Page 60 RS-485 communication network Reference Manual August 2019 00809-0100-4975 Emerson.com/Rosemount...

  • Page 61: Appendix D Accessories

    August 2019 Accessories This appendix describes the accessories that can help you maximize fire detection with the Rosemount 975MR flame detector. Flame simulator Rosemount designed the flame simulators pecifically for use with Rosemount flame detectors. The flame simulator emits IR radiation in a unique sequential pattern corresponding to and recognizable by the detector as fire.
  • Page 62 When testing, keep a distance of at least 20 in. (50 cm) from the detector. 2. Press the Operation button once. The flame simulation lasts for fifty seconds. The detector sends an alarm signal (solid red LED). Emerson.com/Rosemount...
  • Page 63 The simulator will not operate when the voltage from the batteries is lower than the required operational level. Figure D-2: Flame Simulator Battery Replacement A. Simulator B. Battery pack C. Locking disc D. Back cover Rosemount 975MR...
  • Page 64 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. NOTICE For more information, refer to 00809-0500-4975. Emerson.com/Rosemount...
  • Page 65 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 EN 230 MHz), 47 dbuv/m 55022 (230 MHz to 1 GHZ Rosemount 975MR...

  • Page 66: Tilt Mount: Pn 00975-9000-0001

    The duct mount limits the cone of vision of the installed detector to 65 degrees horizontal and 65 degrees vertical. The temperature allowed for the duct mount to be installed is -67 to 392 °F (-55 to 200 °C). For more instructions, refer to 00809-0600-4975. Emerson.com/Rosemount...
  • Page 67 Reference Manual Accessories 00809-0100-4975 August 2019 Figure D-4: Duct Mount Rosemount 975MR...

  • Page 68: Weather Cover: Pn 00975-9000-0003

    Accessories Reference Manual August 2019 00809-0100-4975 Weather cover: PN 00975-9000-0003 The weather cover protects the detector from different weather conditions, such as snow and rain. Figure D-5: Weather Cover Emerson.com/Rosemount...

  • Page 69: Air Shield: Pn 00975-9000-0005

    Pressure: 2 - 3 bar (30 - 45 psi) Fitting: 7/16 in. - 20 UNF - 2 A Operation temperature: -67 to 185 °F (-55 to 85 °C) For more instructions, refer to 00809-0700-4975. Figure D-6: Air Shield Rosemount 975MR...
  • Page 70 Accessories Reference Manual August 2019 00809-0100-4975 Emerson.com/Rosemount...

  • Page 71: Appendix Esil-2 Features

    This appendix details the special conditions to comply with the requirements of EN 61508 for SIL 2. The Rosemount 975MR 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.
  • Page 72 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 73: 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 975MR Flame Detector A. Terminal number 5 B. Terminal number 6 C.
  • Page 74 2019 Emerson. All rights reserved. twitter.com/rosemount_news The Emerson logo is a trademark and service mark of Emerson Electric Co. Rosemount is a Facebook.com/Rosemount mark of one of the Emerson family of companies. All other marks are the property of their youtube.com/RosemountMeasurement respective owners.

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