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Emerson Rosemount 935 Quick Start Manual
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Emerson Rosemount 935 Quick Start Manual

Emerson Rosemount 935 Quick Start Manual

Open path combustible gas detectors
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Quick Start Guide
00825-0100-4035, Rev AB
November 2023
Rosemount
935
™
Open Path Combustible Gas Detectors

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Summary of Contents for Emerson Rosemount 935

  • Page 1 Quick Start Guide 00825-0100-4035, Rev AB November 2023 Rosemount ™ Open Path Combustible Gas Detectors...
  • Page 2 Emerson does not assume any liability arising out of the application or any use of any product or circuit described herein; neither does it convey license under its patent rights or the rights of others.
  • Page 3 November 2023 Quick Start Guide Abbreviation Meaning HART Highway addressable remote transducer communication ® protocol Immune at any distance IECEx International Electrochemical Commission explosion Internet protocol Isopropyl alcohol Infrared Refers to the three infrared sensors Jet fuel Latching Refers to relays remaining in the On state even after the On condition has been removed.

  • Page 4: Table Of Contents

    Quick Start Guide November 2023 Abbreviation Meaning Safety integrity level Unified coarse thread Volts alternating current Volts direct current µm Micrometer Contents Installation instructions......................5 Operation............................ 22 Product certifications........................ 29 Wiring configurations........................31 Declaration of Conformity......................35 Emerson.com/Rosemount...

  • Page 5: Installation Instructions

    To allow for aging of the transmitter and a reduction of the infrared signal due to adverse weather, Emerson recommends using a receiver that is not at the limit of its operating range. The general recommendation is to install the receiver at a distance from the transmitter of not more than 75 percent of the specified operating distance.
  • Page 6 34.5 ft. (10.5 m) 459 ft. (140 m) 38 ft. (11.5 m) 492 ft. (150 m) 42.5 ft. (13 m) 525 ft. (160 m) 47.5 ft. (14.5 m) 558 ft. (170 m) 49 ft. (15 m) 591 ft. (180 m) 51 ft. (15.5 m) 693 ft. (211 m) 52.5 ft. (16 m) 656 ft. (200 m) 54 ft. (16.5 m) Emerson.com/Rosemount...
  • Page 7 November 2023 Quick Start Guide 1.1.6  Wiring For wiring, use color-coded conductors or suitable wire markings or labels. • The wire cross-section must be between 28 to 14 AWG (0.5 mm to 2.5 mm • Select the wire gauge based on the number of detectors used on the same loop and the distance from the control unit.
  • Page 8 Mounts the detector on the tilt mount. Hex key 3/16-in. Aligns the detector. Hex key 5/16-in. Screws ¾ stop plug. Flat screwdriver 4 mm Connects ground terminal. If you order a transmitter or receiver separately, then you will receive one tilt mount. Emerson.com/Rosemount...
  • Page 9 November 2023 Quick Start Guide (continued) Table 1-2: Tools Tool Function Flat screwdriver 2.5 mm Connects wires to the terminal block. 1.3  Certification instructions  WARNING EXPLOSION Do not open the detector, even when isolated, in a flammable atmosphere. • The cable entry point may exceed 182 °F (83 °C). Take suitable precautions when selecting the cable.
  • Page 10 Quick Start Guide November 2023 — Suitable precautions: For example, regular checks as part of routine inspections or establishing from the material's Safety Data Sheets that it is resistant to specific chemicals. Emerson.com/Rosemount...
  • Page 11 November 2023 Quick Start Guide 1.4  Special conditions for safe use from ATEX IECEx certificate The dimensions of the flameproof joints differ from the relevant minimum or maximum values required by Table 2 of IEC/EN 60079-1: 2007 for IIB + H , as detailed in Table 1-3.
  • Page 12 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. Emerson.com/Rosemount...
  • Page 13 November 2023 Quick Start Guide 1.6  Mount receiver and transmitter to tilt mount You can install the receiver and transmitter in two ways with the same tilt mount by using the upper or lower mounting access. Figure 1-2: Mounting the tilt mount and detector using the lower mounting access A.
  • Page 14 B. Transmitter or receiver holding plate C. Vertical crude alignment tightening screw D. Vertical fine alignment tightening screw E. Horizontal fine alignment tightening screw F. Horizontal crude alignment tightening screw G. Horizontal fine alignment screw H. Vertical fine alignment screw Emerson.com/Rosemount...
  • Page 15 November 2023 Quick Start Guide Figure 1-4: Detector and tilt mount assembly using lower mounting access A. Back cover B. Detector C. Alignment tool tightening bolt D. Alignment tool Table 1-4: Tilt mount kit Item Quantity Type / model Tilt mount Screw M10 x 1.5 Spring washer...
  • Page 16 1.7  Wire receiver To install the receiver wiring: Figure 1-5: Receiver with cover removed A. Housing B. Terminal board C. Earth terminal D. Inlet conduit E. Internal earth connection F. Connection to handheld unit G. Receiver holding plate Emerson.com/Rosemount...
  • Page 17 November 2023 Quick Start Guide Procedure 1. Release the back cover secure bolt and open the receiver back cover. 2. Remove the protective plug mounted on the receiver conduit/ cable entry inlet; pull the wires through the receiver inlet. 3. Use a ¾-in-14 NPT or M25 x 1.5 explosion-proof conduit connection/cable gland to assemble the cable/explosion-proof conduit to the receiver.
  • Page 18 5. Connect the grounding wire to the ground screw outside the receiver. The transmitter must be well grounded to earth ground. 6. Place and secure the transmitter back cover by screwing the cover and securing the secure bolt. Emerson.com/Rosemount...
  • Page 19 November 2023 Quick Start Guide 1.9.2  Wiring to transmitter terminals The transmitter contains six wiring terminals. Table 1-6: Transmitter wiring terminals Terminal number Function Power + 24 Vdc Return - 24 Vdc Not used Not used Not used Not used 1.10  Align detector Use the alignment tool to perform full alignment.
  • Page 20 2. Aim the transmitter towards the receiver within the horizontal access. 3. Aim the alignment tool to the center of the front window of the receiver or transmitter. 4. Tighten the outer horizontal lock screw. 5. Aim the vertical axis. 6. Tighten the inner vertical lock screw. Emerson.com/Rosemount...
  • Page 21 November 2023 Quick Start Guide 7. Make sure the alignment tool cross is pointing to the receiver and transmitter center of the window. 8. Repeat Step 2 through Step 7 to align the receiver. 9. Remove the alignment tool. 10. Install the front shield. Postrequisites Once you have completed the fine alignment for both the transmitter and receiver, you can turn on the power.

  • Page 22: Operation

    2. Ensure that the 4–20 mA wiring meter is connected to the receiver. 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. Emerson.com/Rosemount...
  • Page 23 November 2023 Quick Start Guide 2.3  Verify signal Use an RS-485 or HART Field Communicator to verify the signal in ® accordance with Table 2-1. Figure 2-1: Light-Emitting Diode (LED) Indication Before Zero Calibration 1. Verify LED indication. 2. Use Winhost or HART to verify installation parameters. 2.3.1 ...
  • Page 24 A. Maximum gain B. Minimum range C. Median range D. Maximum range E. Reference minimum F. Signal minimum G. Ratio H. NQ ratio I. LEL 2.4  Zero calibrate Prerequisites Zero calibrate after any of the following: • Installation • Realignment Emerson.com/Rosemount...
  • Page 25 November 2023 Quick Start Guide • Window cleaning • Any change in receiver or transmitter position Prerequisites  WARNING Only zero calibrate when: • No combustible gases are present. • There is a clear path between the transmitter and receiver. • Weather conditions are clear. Before zero-calibrating, align the detector precisely.
  • Page 26 Quick Start Guide November 2023 Figure 2-3: Screens shown when zero calibrating with WinHost ® software Emerson.com/Rosemount...
  • Page 27 November 2023 Quick Start Guide Prerequisites Figure 2-4: Magnetic mode selector A. Magnet To switch from each position (Step 1 through Step 3), use either WinHost, HART , or RS-485 or move the magnetic mode selector ® above the magnetic switch (see Figure 2-4).
  • Page 28 3. Repeat Step 1 Step 2 with the Alarm filter. 4. Remove all filters and wait 30 to 60 seconds. Then verify that the receiver returns to Normal status (light-emitting diode [LED] is green and blinking, and the output is 4 mA). Emerson.com/Rosemount...

  • Page 29: Product Certifications

    Product certifications 3.1  ATEX, IECEx The Rosemount 935 is ATEX approved per SIRA 16ATEX1224X and IECEx per IECEx SIR 16.0075X per: This product is suitable for use in hazardous zones 1 and 2 with IIB+H2 group vapors present, and zones 21 and 22 with IIIC combustible dust types.
  • Page 30 Certificate number UL-BR 16.1063X (Rosemount) and UL-BR 22.4058X (Spectronix). 3.6  SIL-2 The Rosemount 935 is TUV approved for SIL-2 requirements per IEC61508. According to SIL-2 requirements, the alert condition can be implemented by an alert signal via the 0–20 mA current loop.

  • Page 31: Wiring Configurations

    November 2023 Quick Start Guide A  Wiring configurations Figure A-1: Receiver 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 Quick Start Guide...
  • Page 32 Quick Start Guide November 2023 Figure A-2: Transmitter wiring terminal A. Power (+) 18 to 32 Vdc B. Return (-) C. Not used D. Not used E. Not used F. Ground Emerson.com/Rosemount...
  • Page 33 November 2023 Quick Start Guide Figure A-3: 0-20 mA Sink 4 Wire A. Receiver B. Controller C. Input power: 18-32 Vdc D. Return E. 0-20 mA meter Quick Start Guide...
  • Page 34 Figure A-4: 0-20 mA Non-Isolated Sink 3 Wire A. Receiver B. Controller C. Input power: 18-32 Vdc D. Return E. 0-20 mA meter Figure A-5: 0-20 mA Source 3 Wire A. Receiver B. Controller C. Input power: 18-32 Vdc D. Return E. 0-20 mA meter Emerson.com/Rosemount...

  • Page 35: Declaration Of Conformity

    November 2023 Quick Start Guide B  Declaration of Conformity Quick Start Guide...
  • Page 36 Quick Start Guide November 2023 Emerson.com/Rosemount...
  • Page 37 November 2023 Quick Start Guide Quick Start Guide...
  • Page 38 Quick Start Guide November 2023 Emerson.com/Rosemount...
  • Page 39 November 2023 Quick Start Guide Quick Start Guide...
  • Page 40 2023 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 of their respective owners.