Emerson Rosemount 935 Reference Manual
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Emerson Rosemount 935 Reference Manual

Emerson Rosemount 935 Reference Manual

Open path combustible gas detector
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Reference Manual
00809-0100-4035, Rev AH
May 2022
™
Rosemount
935
Open Path Combustible Gas Detector

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Summary of Contents for Emerson Rosemount 935

  • Page 1 Reference Manual 00809-0100-4035, Rev AH May 2022 ™ Rosemount Open Path Combustible Gas Detector...
  • Page 2 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 Emerson. While great efforts have been made to ensure the accuracy and clarity of this document, Emerson assumes no responsibility resulting from any omissions in this document or from misuse of the information obtained herein.
  • Page 3 Glossary and abbreviations Abbreviation Meaning Analog video Video values are represented by a scaled signal. ATEX Atmosphere explosives American wire gauge Built-in test CMOS Complementary metal oxide semiconductor image sensor Digital video Each component is represented by a number representing a discrete quantization. Digital signal processing Electromagnetic compatibility Electromagnetic interference...
  • Page 4 Abbreviation Meaning RTSP Real time streaming protocol Safety integrity level Unified coarse thread Volts alternating current Volts direct current µm Micrometer...

  • Page 5: Table Of Contents

    5.2 Power up........................... 39 5.3 Safety precautions........................40 5.4 Verify signal..........................40 5.5 Zero calibrate..........................42 5.6 Functional check........................45 Chapter 6 Maintenance......................47 6.1 General maintenance........................ 47 6.2 Periodic maintenance........................ 47 Chapter 7 Troubleshooting...................... 49 7.1 Maintenance call........................49 Rosemount 935...
  • Page 6 Appendix D Wiring configurations....................65 D.1 RS-485 communication network....................69 Appendix E SIL-2 features......................71 E.1 Safety relevant parameters......................71 E.2 General conditions for safe use....................71 Appendix F Support........................73 F.1 Return of material........................73 Appendix G Declaration of Conformity..................75 Emerson.com/Rosemount...

  • Page 7: Chapter 1 Product Overview

    May 2022 Product overview The Rosemount 935 Gas Detector employs an advanced xenon flash source and integrated electronics package, both housed in stainless steel housings to provide high quality and performance, fast response, and line of sight gas monitoring. The source/ detector is backed by a three year warranty.
  • Page 8 Product overview Reference Manual May 2022 00809-0100-4035 Emerson.com/Rosemount...

  • Page 9: Chapter 2 Technical Description

    Class II/III Div. 1 Group E, F, and G • Functional tested by FM per EN60079-29-4 and approved per FM 6325. • Programmable configuration via the Field Communicator • Fast connections to intrinsically safe (I.S.) approved hand-held diagnostic/calibration unit • Three-year warranty Rosemount 935...

  • Page 10: Applications

    Reference Manual May 2022 00809-0100-4035 Applications The Rosemount 935 system is an optical control fence for combustible gases as defined in the product specification, providing perimeter monitoring and early detection in various applications, such as: • Petrochemical, pharmaceutical, and other chemicals storage and production areas •...
  • Page 11 2.3.4 Gas sensitivity The Rosemount 935 model uses wavelengths around 2.3 µm spectral band to measure air flammability potential between the source and the detector. At this wavelength, many hydrocarbon gases have an absorption peak.
  • Page 12 (DD) software and a special harness. ® 2.3.9 Modbus RS-485 For more advanced communications, the Rosemount 935 has an RS-485 Modbus- compatible output that provides data communication. This feature enables simple commissioning, maintenance, and configuration. 2.3.10 Tilt mount The stainless steel tilt mount provides a small installation footprint that can conform to limited space constraints, while the sturdy construction maintains alignment even in constant vibration.

  • Page 13: Models And Types

    00809-0100-4035 May 2022 Models and types The Rosemount 935 includes four models with the same detector and different sources. That gives the detector the ability to get detection at distances of 23 ft (7 m) to 660 ft (201 m).
  • Page 14 This allows the signals to be maintained even in severe weather conditions. The data is sent to the output interface section. The front window of the detector is heated to improve performance in icing, condensation, and snow conditions. There is one detector type that is suitable for all models Emerson.com/Rosemount...
  • Page 15 A. Front window B. Handheld fast connection C. Weather shield D. Front window section E. Label F. Main housing G. Mounting plate H. Junction box I. Back cover J. Indicator light-emitting diode (LED) K. Earth terminal L. Cable inlet Rosemount 935...
  • Page 16 Technical description Reference Manual May 2022 00809-0100-4035 Emerson.com/Rosemount...

  • Page 17: Chapter 3 Operating Modes

    Reference Manual Operating modes 00809-0100-4035 May 2022 Operating modes Operational modes The Rosemount 935 has four operational modes: • Normal mode • Maintenance call mode (3 mA output) • Fault mode • Zero calibration mode (1 mA output) 3.1.1 Normal mode This mode is used for gas detection.

  • Page 18: Visual Indicators

    Table 3-1: Detector LED indications Detector status LED color LED mode Fault Yellow 4 Hz - flashing Alignment / Standby Yellow 1 Hz - flashing Zero calibration Yellow Constant Normal Green 1 Hz - flashing Warning 2 Hz - flashing Alarm Constant Emerson.com/Rosemount...

  • Page 19: Output Signals

    Fault Yellow 4 Hz - flashing Normal Green 1 Hz - flashing Output signals The Rosemount 935 system provides the following outputs: • 0 - 20 mA current output • RS-485 interface 3.3.1 0-20 mA current output The 0-20 mA output provides the detector status measurements, showing a continuous reading of exact gas concentration.

  • Page 20: System Setup

    Reference Manual May 2022 00809-0100-4035 System setup 3.4.1 Program detection functions The Rosemount 935 incorporates several functions that can be set by the customer using: • WinHost software ® • HART Field Communicator: The detector is equipped with an intrinsically safe connector to enable HART communication.
  • Page 21 The detector has three functions which can be programmed according to the customer requirements at the factory or at the customer facility using a software host or a field communicator, available for download from Emerson.com. Please contact Emerson for more information.
  • Page 22 Operating modes Reference Manual May 2022 00809-0100-4035 Emerson.com/Rosemount...

  • Page 23: Chapter 4 Installation

    4.2.2 Site requirements When installing the Rosemount 935, take into account the weight of the monitored gas compared to that of the surrounding air and the individual site requirements. Ensure that the site selected gives the detector a direct view to the source. The mounting point for each item should be secure and stable with minimal vibrations.
  • Page 24 Above potential leak sources for gases lighter than air. • Near to leak sources along the expected leak trajectory, taking into account prevailing wind directions. NOTICE For optimal performance, avoid placing the detector in locations frequently covered by steam. Emerson.com/Rosemount...
  • Page 25 The maximum number of wire connections in one terminal is two wire cross-sections, each 1 mm • To fully comply with electromagnetic compatibility (EMC) directive and protect against interference caused by radio frequency interference (RFI) and electromagnetic Rosemount 935...

  • Page 26: Preparations For Installation

    Two tilt mount bases (one for the source and one for the detector). • Commissioning kit, three options when ordered: — For methane calibration — For propane calibration — For ethylene calibration The commissioning kit includes: If you order a source or detector separately, you will receive one tilt mount. Emerson.com/Rosemount...

  • Page 27: Certification Instructions

    2 to 3-in pole mount • Wall mount • Protective cover Note See the Rosemount 935 Product Data Sheet for accessory part numbers. 4.3.2 Unpacking Upon receipt of your device, verify the appropriate purchase order. In addition: • Record the part number and the serial number of the detectors and source units and the installation date in the appropriate log book.

  • Page 28: Special Conditions For Safe Use From Atex Iecex Certificate

    The Um is 18 to 32 Vdc in a SELV/PELV system. — Via a safety isolating transformer, complying with the requirements of IEC 61588-2-6 or technically equivalent standard. — Directly connected to apparatus, complying with IEC 60950, IEC 61010-1, or technically equivalent standard. Emerson.com/Rosemount...

  • Page 29: Installing Conduits And Cables

    When pulling the cables through the conduits, ensure that they are not tangled or stressed. Extend the cables about 12 in (305 mm) beyond the detector location to accommodate wiring after installation. • After pulling the conductor cables through the conduits, perform a continuity test. Rosemount 935...

  • Page 30: Mount Detector And Source To Tilt Mount

    You can install the detector and source in two ways with the same tilt mount by using the upper or lower mounting access. Figure 4-2: Mounting the tilt mount and detector using the lower mounting access A. Front shield B. Back cover C. Security screw D. Locating pins E. Alternate mounting location Emerson.com/Rosemount...
  • Page 31 B. Vertical fine alignment screw C. Tilt mount holding plate D. Horizontal fine alignment screw E. Vertical crude alignment tightening screw F. Vertical fine alignment tightening screw G. Horizontal crude alignment tightening screw H. Horizontal fine alignment tightening screw Rosemount 935...
  • Page 32 Procedure 1. Place the tilt mount holding plate in its designated location and secure it with four fasteners through four holes with diameters of NaN in. (NaN mm). NOTICE Skip this step if the tilt mount is already installed. Emerson.com/Rosemount...

  • Page 33: Wire Detector

    G. Connection to field communicator Procedure 1. Release the back cover secure bolt and open the detector back cover. 2. Remove the protective plug mounted on the detector conduit/cable entry inlet. 3. Pull the wires through the detector inlet. Rosemount 935...

  • Page 34: Wiring To Detector Terminals

    The detector has six wiring terminals. Table 4-5 describes the function of each electrical terminal of the detector. Table 4-5: Wiring terminals Terminal number Function Power +24 Vdc Return -24 Vdc 0-20 mA (input) 0-20 mA (output) RS-485 (+) RS-485 (-) Emerson.com/Rosemount...

  • Page 35: Flash Source Wiring

    4. Connect the wires to the required terminals according to the wiring diagram. Wiring to source terminals Wiring configurations. 5. Connect the grounding wire to the ground screw outside the detector. The source must be well grounded to earth ground. Rosemount 935...

  • Page 36: Align Detector

    2. Remove the front shield using the two captive screws. 3. Install the alignment tool assembly on the detector/source front. 4. Fasten the alignment tool with fastening screws. 4.11.1 Perform crude alignment Prerequisites Use a ¼-in Allen screwdriver for all alignment screws. Emerson.com/Rosemount...
  • Page 37 7. Make sure the alignment tool cross is pointing to the detector and source center of the window. 8. Repeat Step 2 through Step 7 to align the detector. 9. Remove the alignment tool. 10. Install the front shield. Rosemount 935...
  • Page 38 Installation Reference Manual May 2022 00809-0100-4035 Postrequisites Once you have completed fine alignment for both the source and detector, you can turn on the power. Emerson.com/Rosemount...

  • Page 39: Chapter 5 Operation

    2. Ensure that the 4-20 mA wiring meter is connected to the detector. 3. Power up the system 18 to 32 Vdc. After sixty seconds, the current meter indicates 4 mA. Postrequisites After powering up, zero calibrate the system. Rosemount 935...

  • Page 40: Safety Precautions

    Use an RS-485 or HART Field Communicator to verify the signal in accordance with Table 5-1. Figure 5-1: Light-Emitting Diode (LED) Indication Before Zero Calibration 1. Verify LED indication. ® 2. Use Winhost or HART to verify installation parameters. Emerson.com/Rosemount...
  • Page 41 The installation information refers to the installation distance. Minimum The minimum distance, as defined according to the model number. Medium Half the maximum distance, as defined according to the model number. Maximum The maximum distance, as defined according to the model number. Rosemount 935...

  • Page 42: Zero Calibrate

    D. Maximum range E. Reference minimum F. Signal minimum G. Ratio H. NQ ratio I. LEL Zero calibrate Prerequisites Zero calibrate after any of the following: • Installation • Realignment • Window cleaning • Any change in detector or source position Emerson.com/Rosemount...
  • Page 43 No combustible gases are present. There is a clear path between the source and the detector. Weather conditions are clear. Before zero calibrating, align the detector precisely. ® Figure 5-3: Screens shown when zero calibrating with WinHost software Rosemount 935...
  • Page 44 4. Wait up to sixty seconds until it switches to Normal mode. The detector reading is now set to Normal. The 0-20 mA output should now indicate 4 mA. Postrequisites Once zero calibration is complete, refer to Signal limitation values to verify the installation parameters. Emerson.com/Rosemount...

  • Page 45: Functional Check

    00809-0100-4035 May 2022 Functional check Emerson calibrated the system at the factory for your specific gas or vapor detection requirements. Use the check filters included in the commissioning kit according to the corresponding calibrating gas to validate correct installation. The functional check filter is a convenient operational check used to confirm that the response has not changed from previous readings.
  • Page 46 Operation Reference Manual May 2022 00809-0100-4035 Emerson.com/Rosemount...

  • Page 47: Chapter 6 Maintenance

    5. Dry the glass with a clean, dry, soft cloth. 6. Enter the date and the names of the person and company who performed the maintenance service in the maintenance logbook. 7. Turn on power to the detector and source. 8. Verify the signal. 9. Zero calibrate. Rosemount 935...
  • Page 48 Maintenance Reference Manual May 2022 00809-0100-4035 10. Do a functional check. Emerson.com/Rosemount...

  • Page 49: Chapter 7 Troubleshooting

    Host status = S 0-20 = 2 mA Light emitting diode (LED) = yellow, blinking Table 7-3: Potential Causes and Resolutions Potential cause Resolution Installation distance is lower than allowed Use a different model. Detector fault Replace or repair the detector. Rosemount 935...

  • Page 50: Detector Is In Constant Misalignment Mode

    Check the power supply and installation. Detector fault Replace or repair the detector. Internal fault Host status = F 0-20 = 1 mA Light-emitting diode (LED) = yellow, blinking Table 7-6: Potential Cause and Resolution Potential cause Resolution Internal fault Replace the detector. Emerson.com/Rosemount...

  • Page 51: Nq Ratio Below The Permitted Limit

    Replace or repair the detector. 7.10 Source fault Yellow light-emitting diode (LED) blinking at the source Table 7-10: Potential Causes and Resolutions Potential cause Resolution Low/high input voltage Check the power supply and installation. Internal fault Replace the source. Rosemount 935...
  • Page 52 Troubleshooting Reference Manual May 2022 00809-0100-4035 Emerson.com/Rosemount...

  • Page 53: Appendix A Ordering Information

    Ordering information 00809-0100-4035 May 2022 Ordering information You can order the Rosemount 935 as separate parts: source (PN TXFXXXXX), detector (PN R1F00XXXX), and commissioning kit (PN 88247-X). Online product configurator Many products are configurable online using our product configurator. With this tool's built-in logic and continuous validation, you can configure your products more quickly and accurately.

  • Page 54: Detector (Receiver)

    Material Measurement Stainless steel ¾-in NPT Stainless steel Product certifications Code Description ATEX and IECEx INMETRO CU TR (EAC) Detector (Receiver) A.5.1 Required model components Model Code Description Combustible Open Path Gas Detector (Receiver) Receiver selection Code Description Receiver Emerson.com/Rosemount...
  • Page 55 Gas calibration Code Description Receiver for combustible gases Methane full scale 5 LEL.m (default) Housing style / conduit Code Material Measurement Stainless steel ¾-in NPT Stainless steel Product certifications Code Description ATEX and IECEx INMETRO CU TR (EAC) Rosemount 935...
  • Page 56 Ordering information Reference Manual May 2022 00809-0100-4035 Emerson.com/Rosemount...

  • Page 57: Appendix B Specifications

    -67 °F (-55 °C) to 149 °F (65 °C) Immunity to false alarm: Does not produce false alarm and is not influenced by solar radiation, hydrocarbon flames, and other external infrared (IR) radiation sources. Electrical specifications Operating voltage 18-32 Vdc Rosemount 935...
  • Page 58 Display and determine the detector status. — Perform detector diagnostics. — Troubleshoot. B.2.1 Power consumption Table B-3: Detector and Source Maximum Power Consumption Without heated optic (max.) With heated optic (max.) Detector 200 mA 250 mA Source 200 mA 250 mA Emerson.com/Rosemount...

  • Page 59: Mechanical Specifications

    Source: 10.5 in (267 mm) x 5.1 in (130 mm) x 5.1 in (130 mm) • Tilt mount: 4.7 in (119 mm) x 4.7 in (119 mm) x 5.5 in (140 mm) Weight Detector: 11 lb (5 kg) Source: 11 lb (5 kg) Tilt mount: 4.2 lb (1.9 kg) Rosemount 935...

  • Page 60: Environmental Specifications

    Reference Manual May 2022 00809-0100-4035 Environmental specifications The Rosemount 935 system is designed to withstand harsh environmental conditions. The source and detector units compensate for adverse conditions while maintaining accuracy. High temperature The Rosemount 935 conforms to DNVGL-CG-0339, class D.
  • Page 61 To fully comply with EMC directive 2014/30/EU and protect against interference caused by radio frequency interference (RFI) and electromagnetic interference (EMI), the cable to the detector must be shielded, and the detector must be grounded. Ground the shield at the detector end. Rosemount 935...
  • Page 62 Specifications Reference Manual May 2022 00809-0100-4035 Emerson.com/Rosemount...

  • Page 63: Appendix C Product Certifications

    Reference Manual Product certifications 00809-0100-4035 May 2022 Product certifications The open path Rosemount 935 is approved for the following certifications: • ATEX, IECEx • UK CA • FM / FMC • SIL-2 • Functional test per FM6325 and EN60079-20-4 ATEX and IECEx...

  • Page 64: Functional Approval

    For more details and guidelines on configuring, installing, operating, and servicing, see SIL-2 Features and TUV report number 968/EZ619.00/13. Functional approval The Rosemount 935 was functionally approved per FM6325. The Rosemount 935 was functionally tested by FM per EN60079-29-4. Emerson.com/Rosemount...

  • Page 65: Appendix D Wiring Configurations

    Wiring configurations 00809-0100-4035 May 2022 Wiring configurations Figure D-1: Detector Wiring Terminal A. Power (+) 18 to 32 Vdc B. Return (-) C. 0-20 mA (input) D. 0-20 mA (output) E. RS-485 (+) F. RS-485 (-) G. Ground Rosemount 935...
  • Page 66 Wiring configurations Reference Manual May 2022 00809-0100-4035 Figure D-2: Source Wiring Terminal A. Power (+) 18 to 32 Vdc B. Return (-) C. Not used D. RS-485 (+) E. RS-485 (-) F. Ground Emerson.com/Rosemount...
  • Page 67 Reference Manual Wiring configurations 00809-0100-4035 May 2022 Figure D-3: 0-20 mA Sink 4 Wire A. Detector B. Controller C. Input power: 18-32 Vdc D. Return E. 0-20 mA meter Rosemount 935...
  • Page 68 Figure D-4: 0-20 mA Non-Isolated Sink 3 Wire A. Detector B. Controller C. Input power: 18-32 Vdc D. Return E. 0-20 mA meter Figure D-5: 0-20 mA Source 3 Wire A. Detector B. Controller C. Input power: 18-32 Vdc D. Return E. 0-20 mA meter Emerson.com/Rosemount...

  • Page 69: Rs-485 Communication Network

    May 2022 RS-485 communication network Using the RS-485 network capability of the Rosemount 935 detector and additional software, it is possible to connect up to 32 detectors in an addressable system with four wires only (two for power and two for communication).
  • Page 70 Wiring configurations Reference Manual May 2022 00809-0100-4035 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 935 open path combustible gas detector can be used in low and high demand mode applications. See IEC 61508-4:2010, Chapter 3.5.16. Safety relevant parameters...
  • Page 72 00809-0100-4035 • The operator must periodically check the transmitter's alarm conditions together with the typical gas calibration checks. The operator must switch the Rosemount 935 OFF and ON. • The connected controller must monitor the 0-20 mA signal current for values below 4 mA and above 20 mA.

  • Page 73: Appendix F Support

    2. Pack all items to protect them from damage and use anti-static bags or aluminum- backed cardboard as protection from electrostatic damage. 3. Mark all packages with Return and include the RMA number. 4. Ship all equipment prepaid to the address provided by your Emerson representative. Important Ship all equipment prepaid.
  • Page 74 Support Reference Manual May 2022 00809-0100-4035 Emerson.com/Rosemount...

  • Page 75: Appendix G Declaration Of Conformity

    Reference Manual Declaration of Conformity 00809-0100-4035 May 2022 Declaration of Conformity Rosemount 935...
  • Page 76 2022 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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