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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 detector
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Quick Start Guide
00825-0100-4035, Rev AA
April 2021
™
Rosemount
935
Open Path Combustible Gas Detector

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Summary of Contents for Emerson Rosemount 935

  • Page 1 Quick Start Guide 00825-0100-4035, Rev AA April 2021 ™ Rosemount Open Path Combustible Gas Detector...
  • Page 2 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 April 2021 Quick Start Guide Abbreviation Meaning Field of view ® 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 April 2021 Contents Installation........................... 5 Operation...........................22 Product certifications......................... 29 Wiring configurations.........................30 Declaration of Conformity......................36 Emerson.com/Rosemount...

  • Page 5: Installation

    1.1.2 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.
  • Page 6 361 (110) 29.5 (9) 394 (120) 33 (10) 427 (130) 34.5 (10.5) 459 (140) 38 (11.5) 492 (150) 42.5 (13) 525 (160) 47.5 (14.5) 558 (170) 49 (15) 591 (180) 51 (15.5) 623 (190) 52.5 (16) 656 (200) 54 (16.5) Emerson.com/Rosemount...
  • Page 7 April 2021 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 2.5 mm • The selected wire gauge should be based on the number of detectors used on the same loop and the distance from the control unit.
  • Page 8 2 to 3-in. pole mount • Wall mount • Protective cover Note See the Rosemount 935 Product Data Sheet for accessory part numbers. 1.2.2 Required tools You can install the detector using general purpose common tools and equipment. Table 1-2: Tools...
  • Page 9 April 2021 Quick Start Guide 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. • The equipment may be used with flammable gases and vapors with apparatus groups IIA and IIB+H2 T4 in the ambient temperature range: -67 to +149 °F (-55 to +65 °C).
  • Page 10 Directly connected to apparatus, complying with IEC 60950, IEC 61010-1, or technically equivalent standard. — Fed directly from cells or batteries. • If the product is to be used as a safety related device, an appropriate independent certification, would be required meeting all the requirements. Emerson.com/Rosemount...
  • Page 11 April 2021 Quick Start Guide Install conduits and cables The conduit and cable installation must comply with the following guidelines: • To avoid water condensation in the detector, install it with the conduits/ cable entries facing downwards. • Use flexible conduits/cables for the last portion connecting to the detector.
  • Page 12 You can install the detector and source 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. Front shield B. Back cover C. Security screw D. Locating pins E. Alternate mounting location Emerson.com/Rosemount...
  • Page 13 April 2021 Quick Start Guide Figure 1-3: Tilt Mount A. Detector/source holding plate 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.
  • Page 14 Prior to mounting the tilt mount to a stable surface, verify that the line of site is unobstructed and corresponds to the detector's installation distance. Procedure 1. Place the tilt mount holding plate in its designated location and secure it with four fasteners through four holes with diameters of 0.3-in. (8.5 mm). Emerson.com/Rosemount...
  • Page 15 April 2021 Quick Start Guide NOTICE Skip this step if the tilt mount is already installed. Removing the detector for maintenance purposes does not require removing the tilt mount. 2. Place the detector with its conduit/cable inlets pointing downwards on the detector holding plate of the tilt mount. 3.
  • Page 16 2. Remove the protective plug mounted on the detector conduit/cable entry inlet. 3. Pull the wires through the detector inlet. 4. Use a ¾-in.-14 national pipe thread (NPT) or M25 x 1.5 explosion- proof conduit connection/cable gland to assemble the cable/ explosion-proof conduit to the detector. Emerson.com/Rosemount...
  • Page 17 April 2021 Quick Start Guide 5. Connect the wires to the required terminals according to the wiring diagram. Wiring configurations. 6. Connect the grounding wire to the ground screw outside the detector. The detector must be well grounded to earth ground. 7.
  • Page 18 2. Remove the protective plug mounted on the source conduit/cable entry inlet; pull the wires through the source inlet. 3. Use a ¾-in.-14 national pipe thread (NPT) or M25 x 1.5 explosion- proof conduit connection/cable gland to assemble the cable/ explosion-proof conduit to the detector. Emerson.com/Rosemount...
  • Page 19 April 2021 Quick Start Guide 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. 6.
  • Page 20 The alignment tool is supplied in the commissioning kit. 2. Aim the source towards the detector within the horizontal access. 3. Aim the alignment tool to the center of the front window of the detector or source. 4. Tighten the outer horizontal lock screw. Emerson.com/Rosemount...
  • Page 21 April 2021 Quick Start Guide 5. Aim the vertical axis. 6. Tighten the inner vertical lock screw. 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.

  • Page 22: 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. See Zero calibrate. Emerson.com/Rosemount...
  • Page 23 April 2021 Quick Start Guide 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.
  • 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 Zero calibrate Prerequisites Zero calibrate after any of the following: • Installation • Realignment Emerson.com/Rosemount...
  • Page 25 April 2021 Quick Start Guide • Window cleaning • Any change in detector or source position WARNING Only zero calibrate when: 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.
  • Page 26 Quick Start Guide April 2021 ® Figure 2-3: Screens shown when Zero Calibrating with WinHost Software Emerson.com/Rosemount...
  • Page 27 April 2021 Quick Start Guide 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 Step 1 Step 2 with the Alarm filter. 4. Remove all filters and wait 30 to 60 seconds. Then verify that the detector 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

    April 2021 Quick Start Guide Product certifications The open path Rosemount 935 is approved for the following certifications: • ATEX, IECEx • FM / FMC • SIL-2 • Functional test per FM6325 and EN60079-20-4 ATEX and IECEx The Rosemount 935 is approved per:...

  • Page 30: Wiring Configurations

    Quick Start Guide April 2021 Wiring configurations Figure A-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 Emerson.com/Rosemount...
  • Page 31 April 2021 Quick Start Guide Figure A-2: Source Wiring Terminal A. Power (+) 18 to 32 Vdc B. Return (-) C. Not used D. RS-485 (+) E. RS-485 (-) F. Ground Quick Start Guide...
  • Page 32 Quick Start Guide April 2021 Figure A-3: 0-20 mA Sink 4 Wire A. Detector B. Controller C. Input power: 18-32 Vdc D. Return E. 0-20 mA meter Emerson.com/Rosemount...
  • Page 33 April 2021 Quick Start Guide Figure A-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 A-5: 0-20 mA Source 3 Wire A. Detector B. Controller C. Input power: 18-32 Vdc D.
  • Page 34 April 2021 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 35 April 2021 Quick Start Guide Quick Start Guide...

  • Page 36: Declaration Of Conformity

    Quick Start Guide April 2021 Declaration of Conformity Emerson.com/Rosemount...
  • Page 37 April 2021 Quick Start Guide Quick Start Guide...
  • Page 38 Quick Start Guide April 2021 Emerson.com/Rosemount...
  • Page 39 April 2021 Quick Start Guide Quick Start Guide...
  • Page 40 For more information: www.emerson.com © 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.