Emerson Rosemount 975MR Reference Manual Download Page 1

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Reference Manual

00809-0100-4975, Rev DB

August 2019

Rosemount

™

975MR

Multi-Spectrum Infrared Flame Detector

Summary of Contents for Rosemount 975MR

Page 1: ...Reference Manual 00809 0100 4975 Rev DB August 2019 Rosemount 975MR Multi Spectrum Infrared Flame Detector ...

Page 2: ...ed 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 f...

Page 3: ...ng 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 stat...

Page 4: ...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 4 ...

Page 5: ...e detector 39 3 1 Power up 39 3 2 Safety precautions 39 3 3 Testing procedures 40 Chapter 4 Maintenance and troubleshooting 43 4 1 Maintenance 43 4 2 Troubleshooting 44 Appendix A Specifications and reference data 47 A 1 Technical specifications 47 A 2 Electrical specifications 47 A 3 Outputs 48 A 4 Mechanical specifications 50 A 5 Environmental specifications 50 Appendix B Wiring instructions 53 ...

Page 6: ... 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 Contents Reference Manual August 2019 00809 0100 4975 vi Emerson com Rosemount ...

Page 7: ...is possible by means of RS 485 based Modbus communication or HART communication in models with 0 20 mA output The detector enclosure is ATEX certified Exd flameproof with an integral segregated rear Exe terminal compartment avoiding exposure of the sensors and electronics to surrounding environment Hence the combined approval Ex II 2G D Ex db eb op is IIC T4 G Ex tb op is IIIC T96 C Db 55 C Ta 75 ...

Page 8: ...ription 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 Auxiliary relay Current type 1A Analog HART RS 485 relays fault alarm Normally closed Normally open N A Sink 2A Analog HART RS 485 relays fault alarm Normally closed Normally open nor...

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 00975 9000 0014 4 in 101 6 mm pipe mount 00975 9000 0015 Spare battery charger for use with flame simulator Table 1 3 Output Configurations Output con...

Page 10: ... and IECEx flameproof NOTICE Check your specific part numbers against the information in Checking the product type 1 3 Features and benefits The flame detector has the following features and benefits Detection range Up to 215 ft 65 m for a 1 ft 2 0 1 m2 n heptane fire Ultra high immunity to false alarms See Table 1 6 Advanced digital processing of the dynamic characteristics of fire flickering thr...

Page 11: ...4 2 Heated optics The flame detector uses 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 The heated optics can be set to one of the following Off not operating On continuously Automatic per temperature change default the operator can define the start temper...

Page 12: ...gnostic tools 1 4 5 Product certifications The flame detector has the following certifications ATEX IECEx FM CSA SIL 2 TUV EN54 10 Inmetro UL TR CU EAC 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...

Page 13: ...rt 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 and guidelines for configuring installing operating and service see SIL 2 features and TUV Report No 968 FSP 1223 EN54 10 The flame detector is approved per EN54 10 and CPD The detector is listed as Class 1 for sensitivity settings 15 30 45 an...

Page 14: ...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 four user selectable sensitivity ranges For each range there are two response levels Warning Pre alarm Alarm The detection distance for the Warning level is approximately 10 percent higher than the Alarm dist...

Page 15: ...to n heptane 1 ft 2 0 1 m2 and is defined as 100 percent sensitivity For fuel fire standard pan fire size 1 ft 2 0 1 m2 For gas flame 30 in 0 75 m high 10 in 0 25 m wide plume fire Maximum response time 10 sec Table 1 5 Fuel Sensitivity Ranges Type of fuel Percent of max distance at each sensitivity range Max distance ft m Gasoline 100 215 65 n Heptane 100 215 65 JP5 70 150 45 Kerosene 70 150 45 D...

Page 16: ...1 5 2 Cone of vision Horizontal 100 Figure 1 1 Horizontal Field of View Vertical 50 down 45 up Introduction Reference Manual August 2019 00809 0100 4975 16 Emerson com Rosemount ...

Page 17: ...able 1 6 Immunity to False Alarm Sources Radiation source Immunity distance ft m Indirect or reflected sunlight IAD Vehicle headlights low beam conforming to MS53023 1 IAD Incandescent frosted glass light 300 W IAD Fluorescent light with white enamel reflector standard office or shop 70 W or two 35 W IAD Reference Manual Introduction 00809 0100 4975 August 2019 Rosemount 975MR 17 ...

Page 18: ...ght MX 99 I U IAD Radiation heater 3 000 W 3 1 Radiation heater 1 000 W with fan IAD Quartz lamp 1 000 W 3 1 Mercury vapor lamp IAD Grinding metal IAD Lit cigar 1 0 3 Lit cigarette 1 0 3 Match wood stick including flare up 13 4 1 IAD Immune at any distance 2 All sources are chopped from 0 to 20 Hz Table 1 7 Welding Immunity Distance Sensitivity setting Detection range Immunity distance 1 50 ft 15 ...

Page 19: ... 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 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 Reference Manual Introduction 00809 0100 4975 August 2019 R...

Page 20: ...otocol 1 5 6 Detector status The possible detector function statuses are listed in the table below Use HART or Modbus to see a more detailed fault analysis Table 1 10 Detector Statuses Status Description Normal Normal operation 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 ...

Page 21: ...T 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 If selected upon detection of a fire the detection signal is latched until the operator manually resets the de...

Page 22: ...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 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...

Page 23: ...s of built in test results function as described in Table 1 12 and Table 1 13 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 Table 1 12 Results of a Successful Built in Test Output Result Fault relay Output configurations 1A 2A and 1R remain CLOSED Output configurations 3A and 2R rem...

Page 24: ... and 2R is activated for three seconds only when the function Auxiliary BIT is set to YES 0 20 mA output Output configurations 1A 2A and 3A Initiates 20 mA only when the function Alarm BIT is set to YES Initiates 16 mA when the function Auxiliary BIT is set to YES and the function Alarm BIT is set to NO Power LED Green flashing 1 Hz Table 1 15 Results of an Unsuccessful Manual Built in Test Output...

Page 25: ...d and the detector must be grounded Ground the shield 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 T...

Page 26: ...ries 2 2 1 Checking the product type Confirm your product has the configuration options you ordered Check the detailed model number on the label and compare this information with the descriptions contained in Model and types 2 3 Required tools The operator can install the detector using general purpose tools and equipment Table 2 1 lists the specific tools required to install the detector Table 2 ...

Page 27: ...079 19 Only suitably trained personnel should inspect and maintain the detector in accordance with the applicable code of practice such as EN 60079 14 1997 EN 60079 17 and EN 60079 19 Only suitably trained personnel should repair the detector in accordance with the applicable code of practice such as EN 60079 19 EN 60079 17 and EN 60079 19 The certification of this equipment relies upon the follow...

Page 28: ...en 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 about 12 in 30 cm beyond the detector location to accommodate wiring after installation After p...

Page 29: ...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 Reference Manual Installing the detector 00809 0100 4975 August 2019 Rosemount 975MR 29 ...

Page 30: ...gure 2 2 Tilt Mount Assembly A Tilt holding plate B Tilt mount C Horizontal locking screw D Vertical locking screw E Detector holding plate Installing the detector Reference Manual August 2019 00809 0100 4975 30 Emerson com Rosemount ...

Page 31: ...e 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 ensure the view of the area is unobstructed Secure th...

Page 32: ... 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 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 See Figure 2 4 and Tab...

Page 33: ...ls 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 Reference Manual Installing the detector 00809 0100 4975 August 2019 Rosemount 975MR 33 ...

Page 34: ...cribes the function of each terminal for all the output configurations Table 2 2 Rosemount 975MR Output Configurations 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 Manual built in test Manual built in test Manual built in test Manual built in test Manual built in test 4 Fault relay N C Fault relay N C Fault relay N O Fault relay...

Page 35: ...liary 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 Configure the 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 t...

Page 36: ...the alarm level is still present the detector activates the alarm outputs 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 output The LEDs and outputs indicate warning levels during the delay time only if the fire condition exists 2 8 3 Address setup The flame detector provides up to 247 addresses that can...

Page 37: ... 1 Only available in output configurations 1R and 2R 2 8 5 Heated optics To configure optical window heating select one of the modes listed below OFF Optical window surface heating does not operate ON Optical window surface heating operates continuously AUTO Optical window surface heating operates according to temperature change Specify the start temperature below which the optical window surface ...

Page 38: ...Installing the detector Reference Manual August 2019 00809 0100 4975 38 Emerson com Rosemount ...

Page 39: ...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 do one of the following Disconnect power terminal number 1 or terminal number 2 Initiate a manual built in test 3 2 Safety precautions After powering up the detector requires almost no attention in order to function properly but no...

Page 40: ...t configurations 1A 2A and 3A the auxiliary relay is not available This function is not used Heated optics Auto Heat on 41 F 5 C The detector starts heating the window for any temperature below this value In order to change the default function use USB RS 485 harness kit PN 00975 9000 001 HART protocol Refer to manual 00809 0200 4975 for instructions 3 3 Testing procedures This section describes t...

Page 41: ... the detector generates a fire alarm signal See Flame simulator 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 disconnect automatic extinguishing systems or any external devices that may be activated during this process To perform a flame simulator test Procedure 1 Power up the sys...

Page 42: ...ed 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 LED Red steady The detector is now ready for operation Operating the detector Reference Manual August 2019 00809 0100 4975 42 Emerson com Rosemount ...

Page 43: ...rations 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 W...

Page 44: ...ude a copy of the maintenance records 4 2 Troubleshooting This section is intended to be a guide to correct problems that may happen during normal operation 4 2 1 Fault relay at N O LEDs off 0 20 mA at 0 mA No power to the unit Recommended actions 1 Check that the correct power is sent to the detector 2 Check power polarity 3 Check wiring in the detector 4 Send the detector back for repairs 4 2 2 ...

Page 45: ... Replace the detector 4 2 4 Red LED constantly on If no fire exists the detector alarm may be latched 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 Reference Manual Maintenance and troubleshooting 00809 0100 4975 August 2019 Rosemount ...

Page 46: ...Maintenance and troubleshooting Reference Manual August 2019 00809 0100 4975 46 Emerson com Rosemount ...

Page 47: ...e ranges for 1 ft 2 0 1 m2 n heptane pan fire from 50 ft 15 m to 215 ft 65 m Fields of view Horizontal 100 vertical 95 Built in test BIT Automatic and manual 1 30 in 0 75 m high 10 in 0 25 m wide plume fire A 2 Electrical specifications Operating voltage 18 32 Vdc Power consumption Table A 2 Table A 2 Electrical Specifications Operating voltage Status All outputs Without 0 20 mA Power consumption ...

Page 48: ...ns for electrical wiring 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 Model and types 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 fault relay N O a...

Page 49: ...l wiring The maximum permitted load resistance is 600 Ω Table A 4 20 mA Current Output State Output Fault 0 1 mA BIT fault 2 mA 10 Normal 4 mA 10 Warning 16 mA 5 Alarm 20 mA 5 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 ho...

Page 50: ...2 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 Mechanical specifications Enclosure Stainless steel 316 Water and dust tight NEMA 250 type 6p IP 66 and IP 67 per EN 60529 Electronic modules Conformal coated Electrical connection two entries in 14 NPT conduit or M25 x 1 5 Dimensions 4 x 4 6 x 6 18 in 101 6 x 117 x 157 mm...

Page 51: ...I Mechanical shock of 30 g half sine wave for 11 msec CAUTION RFI and EMI may cause interference To fully comply with EMC directive 2014 30 EU and protect against interference caused by RFI and EMI shield the cable to the detector and ground the detector Ground the shield at the detector end Table A 5 Electromagnetic Compatibility EMC Test standard Level per Electrostatic discharge ESD IEC 61000 4...

Page 52: ...Specifications and reference data Reference Manual August 2019 00809 0100 4975 52 Emerson com Rosemount ...

Page 53: ...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 installation requirements Refer to power supply range for voltage extreme applied Table B 2 Wiring Length in Meters Feet Number of detectors Recommended wire diameter AWG Powe...

Page 54: ...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 voltag...

Page 55: ...inals 5 8 9 1A Fault relay N C 0 20 mA sink 0 20 mA sink 2A Fault relay N C Alarm relay N C 0 20 mA source 3A Fault relay N O Alarm relay N C 0 20 mA source 1R Fault relay N C Auxiliary relay N O Auxiliary relay C 2R Fault relay N O Auxiliary relay N O Auxiliary relay C Reference Manual Wiring instructions 00809 0100 4975 August 2019 Rosemount 975MR 55 ...

Page 56: ... Wiring for 4 Wire Controllers Using Output Configuration 1A or 2A Figure B 3 0 20 mA Output Configuration 1A Sink 4 Wire Default Wiring instructions Reference Manual August 2019 00809 0100 4975 56 Emerson com Rosemount ...

Page 57: ... 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 Reference Manual Wiring instructions 00809 0100 4975 August 2019 Rosemount 975MR 57 ...

Page 58: ...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 Wiring instructions Reference Manual August 2019 00809 0100 4975 58 Emerson com Rosemount ...

Page 59: ...n Using repeaters the number of detectors can be much larger 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 Reference Manual RS 485 communication network 00809 0100 49...

Page 60: ...RS 485 communication network Reference Manual August 2019 00809 0100 4975 60 Emerson com Rosemount ...

Page 61: ...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 This allows the detectors to be tested under simulated fire conditions without the associated risks of an open flame Figure D 1 Flame Simulator Reference Manual Accessories 00809 0100 4975 August 2019 Rosemount 975MR 61 ...

Page 62: ...er reason in a hazardous area CAUTION The following test simulates a real fire condition and may activate the extinguishing system of other alarms If you don t want this to happen disconnect inhibit other alarms 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 sensitivi...

Page 63: ... the range NOTICE Keep the flame simulator in a safe place when not in use D 1 5 Charge 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 1 000 times without having to be recharged The simulator will not operate when the voltage from the batteries is lower than the required operational ...

Page 64: ...e back cover with the locking screw D 1 6 Replace the battery NOTICE The item letters shown in this procedure can be found in Figure D 2 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 Inse...

Page 65: ...5 Gb Ex ib op is tb IIIC T135 C Db EMI compatibility See Table D 3 and Table D 4 Table D 3 Immunity Tests 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 t...

Page 66: ...here 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 degrees horizontal and 65 degrees vertical The temperature allowed for the duct mount to be inst...

Page 67: ...Figure D 4 Duct Mount Reference Manual Accessories 00809 0100 4975 August 2019 Rosemount 975MR 67 ...

Page 68: ...N 00975 9000 0003 The weather cover protects the detector from different weather conditions such as snow and rain Figure D 5 Weather Cover Accessories Reference Manual August 2019 00809 0100 4975 68 Emerson com Rosemount ...

Page 69: ...nt 975 series optical flame detectors allows operators to install the flame detectors 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 Oper...

Page 70: ...Accessories Reference Manual August 2019 00809 0100 4975 70 Emerson com Rosemount ...

Page 71: ...2 Functional check of the detector every 365 days HFT 0 PFD 4 5 x 10 4 4 5 of SIL 2 if only alarm relay is used for alerting PFD 4 9 x 10 4 4 9 of SIL 2 if 0 20 mA interface is used as alarm PFH 1 5 x 10 7 1 h 14 9 of SIL 2 for 0 20 mA application SFF 95 fulfills the conditions of EN 61508 for SIL 2 E 2 Guidelines for configuring installing operating and service The alert conditions according to S...

Page 72: ...st 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 th...

Page 73: ...ending on the application 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 Rosemount 975MR flame detector D End of line resistor Reference Manual End of line resistor 00809 0100 4975 August 2019 Rosemount 97...

Page 74: ...ab Emirates P O Box 17033 971 4 811 8100 971 4 886 5465 safety csc emerson com ASIA PACIFIC Emerson Automation Solutions 1 Pandan Crescent Singapore 128461 Republic of Singapore 65 6 777 8211 65 6 777 0947 safety csc emerson com Linkedin com company Emerson Automation Solutions twitter com rosemount_news Facebook com Rosemount youtube com RosemountMeasurement 2019 Emerson All rights reserved The E...

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