Emerson Rosemount 625IR Manual
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Emerson Rosemount 625IR Manual

Emerson Rosemount 625IR Manual

Optical infrared gas detector
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Manual
MS-00809-0100-3625, Rev AA
January 2024
Rosemount
™
625IR
Optical Infrared Gas Detector

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Summary of Contents for Emerson Rosemount 625IR

  • Page 1 Manual MS-00809-0100-3625, Rev AA January 2024 Rosemount ™ 625IR Optical Infrared Gas Detector...
  • Page 2 Please read the general warnings in the following chapters.  WARNING The Rosemount 625IR Optical Gas Detector is certified for and intended for use in potentially hazardous areas. Install and use the gas detector in accordance with the appropriate local or national regulations.
  • Page 3 Related information Abbreviations...
  • Page 4 Warranty • 5 (five) year limited warranty The Rosemount 625IR warrants for normal use within gas detection, in accordance with this Manual. Contact your supplier for further instructions on warranty and claims procedures. Related information Contact support Abbreviations Abbreviation Definition...

  • Page 5: Table Of Contents

    5.2 Potential errors..........................52 Chapter 6  Classification of gases......................55 Appendix A  Description and detection principle..................57 A.1 Detection principle........................58 Appendix B  Ordering information, specifications, and certifications..........59 Appendix C  Dimensions..........................61 Appendix D  Contact support........................65 Appendix E  Detecting other gases......................67 Rosemount 625IR...
  • Page 6 Contents Manual January 2024 MS-00809-0100-3625 Emerson.com...

  • Page 7: Chapter 1 Installation

    1.2  Preparations and positioning considerations The Rosemount 625IR is a point gas detector, and qualified personnel should carefully assess its chosen location. However, each installation is unique, and the operators must make detailed considerations locally in order to get the best coverage. Below are some general matters to consider.

  • Page 8: Positioning Considerations And Response Time

    B. Detector out of range C. Detector in range D. Wind direction 1.3  Positioning considerations and response time IEC 60089-29-1 mentions three methods that can be used to test response time: • Flow (tested by manufacturer) • Diffusion by immersion (tested by manufacturer) Emerson.com...
  • Page 9 15.5 (slow) For this method, use water to force the gas with a specific speed and direction. With the laminar gas flow, the response time depends on the detector's orientation. The fastest and slowest orientations are indicated in parentheses. Rosemount 625IR...
  • Page 10 January 2024 MS-00809-0100-3625 For the shortest response time, orient the detector so the air flow is directed directly into the opening of the gas detector as illustrated in Figure 1-2. Figure 1-2: Detector orientation A. Recommended orientation B. Air flow Emerson.com...

  • Page 11: Mounting The Detector

    January 2024 1.4  Mounting the detector Figure 1-3, the Rosemount 625IR is shown securely mounted. Figure 1-3: 625IR securely mounted Mount the detector with the longitudinal axis in the horizontal direction as illustrated in Figure 1-4. You can rotate it in any direction along this longitudinal axis. This position reduces the accumulation of contamination on the optical parts (lens and mirror).
  • Page 12 Installation Manual January 2024 MS-00809-0100-3625 Figure 1-5: Detector mounted on the wall Figure 1-6: Detector mounted flat Figure 1-7: Detector mounted in roof Emerson.com...
  • Page 13 Manual Installation MS-00809-0100-3625 January 2024 1.4.1  Pole mounting Figure 1-8 shows the Rosemount 625IR with the pole mount kit. A pole with a diameter of about 3 in. (60 mm) should be sufficient. Figure 1-8: Pole mount kit Rosemount 625IR...
  • Page 14 2. Make sure the O-ring is in place and not damaged. 3. Slide the 625IR into the plate duct and fix it with the two metal brackets. Emerson can supply the duct flange kit with a nozzle to allow for gas testing without removing the detector from the duct flange.
  • Page 15 Options for mounting Rosemount 625IR in ducts or pipes There are three possible configurations for mounting the duct flange: Figure 1-10: Rosemount 625IR mounted in the duct flange kit The operator can easily remove the detector from the duct to perform a gas test. The nozzle is not used for gas testing.
  • Page 16 Manual January 2024 MS-00809-0100-3625 Figure 1-12: 625IR Duct mounted in duct flange kit You can perform a gas test through the rigid gas pipe. It can be challenging to perform gas tests if there is air flow in the duct. Emerson.com...

  • Page 17: Electrical Connections And Earthing

    Installation MS-00809-0100-3625 January 2024 1.5  Electrical connections and earthing Connect the Rosemount 625IR chassis to local clean earth. Use one of the two external earthing points illustrated in Figure 1-13 using an earthing cable ring lug. Figure 1-13: Electrical connections and earthing A.
  • Page 18 -4 °F (-20 °C). During this time, the detector runs self-diagnostics and if the indicator is configured to be active, it will be yellow. Postrequisites After this boot-up time, the detector is ready to detect gas, but for a very precise and accurate test, allow the detector another 20 minutes to warm up. Emerson.com...

  • Page 19: Environment Shield

    Installation MS-00809-0100-3625 January 2024 1.5.2  Performing loop test The Rosemount 625IR can perform a loop test through the HART or Modbus interface. ® ® The loop test allows you to manually set the analog signal output to a selected value for a limited time.
  • Page 20 Installation Manual January 2024 MS-00809-0100-3625 Figure 1-14: Inserting the environment shield Figure 1-15: Detector with environment shield inserted Related information Clean optics (lens and mirror) Emerson.com...

  • Page 21: Sunshade

    January 2024 1.7  Sunshade The operator can fit the Rosemount 625IR with a sunshade, keeping it from being exposed to direct sunlight. The sunshade can also stop the accumulation of snow, sand, or other unwanted substances. The figures illustrate how to install the sunshade. Use the same screws as the detector to mount the sunshade.

  • Page 22: Mosquito Net

    Installation Manual January 2024 MS-00809-0100-3625 For wall or pole mounting, Emerson recommends using the sunshade and extra section to shield the detector from direct sunlight, rain, and snow. 1.8  Mosquito net You can fit the mosquito net accessory to the gas detector to prevent insects from blocking the optics.

  • Page 23: Blocking Kit

    Blocking kit Site maintenance, such as sand blasting and painting, might damage the detector. To protect the detector during such work, Emerson recommends using the blocking kit accessory. The blocking kit fits into the detector, protecting both the optics and detector from paint, sand blasting, and dirt.
  • Page 24 Installation Manual January 2024 MS-00809-0100-3625 Emerson.com...

  • Page 25: Configure The Detector

    The default settings might be different from the site alarm levels. 3. Perform the function test. 4. Verify that the site safety system is receiving the gas signal from the detector. Related information Boot up the detector Function test Rosemount 625IR...
  • Page 26 Configure the detector Manual January 2024 MS-00809-0100-3625 Emerson.com...

  • Page 27: Chapter 3 Operation

    The time between two periodical tests of the detector's safety functions is from a safety context called the test interval. The Rosemount 625IR is certified in accordance with the standard IEC 61508 with Safety Integrity Level 2 (SIL2) rating. If used in a one out of two (1oo2) configuration, the detector is rated for SIL3.
  • Page 28 The kit consists of a gas nozzle on the nose of the detector. In between the gas nozzle and gas test box, there is a gas pipe to allow for the gas to flow from the gas test box and into the detector through the gas nozzle. • Gas nozzle (if not already fitted) Emerson.com...
  • Page 29 Operation MS-00809-0100-3625 January 2024 • Rosemount 625IR fitted with environment shield, especially if there is any wind • Gas cylinder with same type of gas as detector is rated to detect — Concentration of test gas recommended to 50 ±10 percent full scale (FS) —...
  • Page 30 Figure 3-3: Gas cylinder connected to gas test box 2. Apply the gas from the gas cylinder. 3. Observe whether or not the detector is showing a gas alarm or if a gas response is received at the site gas detection system. Emerson.com...

  • Page 31: Verify Detector Accuracy

    3.2  Verify detector accuracy Emerson has calibrated the Rosemount 625IR and 625IR Duct for life at the factory. They do not need to be re-calibrated. At the factory, Emerson has taken great care to account for environmental effects, such as gas concentration, gas temperature, ambient pressure, and humidity, to calibrate very precisely.

  • Page 32: Check Reaction Time

    The time for the reading to stabilize depends on the gas flow and the length of the tube. 6. Start the data logger and log for two minutes. 7. Calculate the average gas value and standard deviation from the data logger and compare it with the detector's accuracy specifications. Emerson.com...
  • Page 33 A one percent change in ambient pressure from 15 psi (1 bar) will result in a one percent change in gas reading. Take weather conditions into account when calculating the detector's accuracy. Rosemount 625IR...
  • Page 34 Operation Manual January 2024 MS-00809-0100-3625 Emerson.com...

  • Page 35: Chapter 4 Maintenance

    January 2024 4  Maintenance The Rosemount 625IR requires very little maintenance. The detector does not have any internal functions that require regular monitoring or maintenance. For regular maintenance, clean the optics and inspect the detector's exterior for damage. The detector self diagnoses any damage to its internal parts.

  • Page 36: Keeping A Stable Zeroing Of The Detector

    4. Fit the gas sampling kit as illustrated in Figure 3-4. 5. Apply the nitrogen or clean air at a flow rate above 0.3 liters/minute. 6. Wait for one to two minutes until the reading stabilizes. 7. Start zeroing from the HART interface. 8. Wait for confirmation. Emerson.com...

  • Page 37: Self Diagnostics

    Diagnostics log. During any service or inspection of the detector, the technician downloads the Diagnostics log at the vendor. The customer can also download the Diagnostics log and send it to the vendor for analysis and troubleshooting. Rosemount 625IR...
  • Page 38 Maintenance Manual January 2024 MS-00809-0100-3625 Emerson.com...

  • Page 39: Chapter 5 Troubleshooting

    ® 5.1.1  Status flags The following sections are the status flags for the Rosemount 625IR. Not all status flags will impact the 0-20 mA safety output. The operator can access all statuses through HART ® FAULT The 0-20 mA output goes into mode.
  • Page 40 FAULT NOTICE Keeping the detector at too low of a temperature can reduce the detector's lifetime. Recommended actions 1. Check that the detector is not exposed to an ambient temperature that is too low. Emerson.com...
  • Page 41 1. Check that the detector is not exposed to an ambient temperature that is too low. 2. If the ambient temperature is inside specification, check the temperature sensor. Output current fixed Status type Function Check Potential cause Loop testing in progress. Recommended action Wait for test to finish. Rosemount 625IR...
  • Page 42 Status type Failure Potential cause Signal from the sensor is too high, indicating too much light is reflected into the lens. Recommended action Contact support. EEPROM CRC fault Status type Failure Potential cause Hardware issue. Recommended action Contact support. Emerson.com...
  • Page 43 Failure Potential cause A voltage in the internal electronics is outside of specification. Recommended action Contact support. The SRC voltage not OK (30 V) Status type Failure Potential cause A voltage in the internal electronics is outside specification. Rosemount 625IR...
  • Page 44 Detector zeroing has been performed while the optics was dirty. Recommended actions 1. Clean optics. 2. Zero the detector. S1 current error Status type Failure Potential cause Infrared (IR) source 1 issue. Recommended action Contact support. S2 current error Status type Failure Emerson.com...
  • Page 45 Electronics issue. Recommended action Contact support. Output module CRC fault Status type Failure Potential cause Electronics issue. Recommended action Contact support. RAM fault Status type Failure Potential cause Electronics issue. Recommended action Contact support. Flash fault Status type Failure Rosemount 625IR...
  • Page 46 Contact support. Init timer is running Status type FAILURE Potential cause This is set during detector start-up, and the analog output is set to until the FAULT detector is ready. Recommended action Wait for start-up to finish, normally one minute. Emerson.com...
  • Page 47 Potential cause Electronics issue. Recommended action Contact support. Internal temperature sensor fault Status type Failure Potential cause Electronics issue. Recommended action Contact support. Sensor temperature sensor fault Status type Failure Potential cause Electronics issue. Recommended action Contact support. Rosemount 625IR...
  • Page 48 Potential cause Electronics issue. Recommended action Contact support. Secure EEPROM bank 2 error Status type Failure Potential cause Electronics issue. Recommended action Contact support. Secure EEPROM bank 3 error Status type Failure Potential cause Electronics issue. Recommended action Contact support. Emerson.com...
  • Page 49 Perform a gas test with clean air to verify the detector showing zero when no gas is present. 5.1.2  Light indicator The Rosemount 625IR has a built-in multi-colored light indicator. Table 5-1: Light indicator settings Status type Indicator Description and typical applications...
  • Page 50 Maintenance 3 mA 0.6 - 3.5 Signals if optics are getting dirty. request Emerson recommends cleaning the lens and mirror if you see this alert. Detector is still detecting gas inside the specifications. Out of 2.5 mA...
  • Page 51 Troubleshooting MS-00809-0100-3625 January 2024 5.1.4  HART ® The Rosemount 625IR has a HART digital protocol superimposed on the current loop output. The document, Rosemount 625IR HART Interface Instruction, describes the HART commands. HART electrical connection ® A HART master requires a minimum loop resistance of 250 ohm for communication.

  • Page 52: Potential Errors

    If the analog output is now within range, troubleshooting is complete. • If the analog output is still out of range, see Signal, Gas reading during test, Frequent service. 7. If you cannot resolve the issue, contact the supplier. Emerson.com...
  • Page 53 The detector often requires the operator to clean the optics. Recommended action Verify that the detector is mounted in the correct orientation. NOTICE If the detector is mounted vertically, contaminants will accumulate on the optics. Related information Mounting the detector Rosemount 625IR...
  • Page 54 Troubleshooting Manual January 2024 MS-00809-0100-3625 Emerson.com...

  • Page 55: Classification Of Gases

    National Fire Protection Association (NFPA) 497 (2017) Recommended Practice for the Classification of Flammable Liquids, Gases, or Vapors and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas • PubChem open chemistry database at the National Institutes of Health (NIH): https:// pubchem.ncbi.nim.nih.gov/. Rosemount 625IR...
  • Page 56 Classification of gases Manual January 2024 MS-00809-0100-3625 Emerson.com...

  • Page 57: Appendix A Description And Detection Principle

    Description and detection principle The Rosemount 625IR is an explosion-proof, rugged optical gas detector that can detect flammable gases. Emerson calibrates the detector at the factory for life, so it requires very little effort to install and maintain the detector.

  • Page 58: Detection Principle

    Manual January 2024 MS-00809-0100-3625 A.1  Detection principle The Rosemount 625IR uses an optical detection principle. The basic working principle is illustrated in Figure A-2 and consists of the following basic parts: Figure A-2: 625IR detection principle A. Light source: Generates infrared light (2-6 μm region) and directs it to B.

  • Page 59: Appendix B Ordering Information, Specifications, And Certifications

    Manual Ordering information, specifications, and certifications MS-00809-0100-3625 January 2024 B  Ordering information, specifications, and certifications For ordering information and specifications, refer to the Rosemount 625IR Product Data Sheet. For product certifications, refer to the Rosemount 625IR Quick Start Guide. Rosemount 625IR...
  • Page 60 Ordering information, specifications, and certifications Manual January 2024 MS-00809-0100-3625 Emerson.com...

  • Page 61: Appendix C Dimensions

    Manual Dimensions MS-00809-0100-3625 January 2024 C  Dimensions Rosemount 625IR dimensions Figure C-1: Mounting Rosemount 625IR...
  • Page 62 Dimensions Manual January 2024 MS-00809-0100-3625 Figure C-2: Width Figure C-3: Length and height 625IR Duct dimensions The 625IR Duct comes in three lengths with dimensions shown in Figure C-4, Figure C-5, Figure C-6. Emerson.com...
  • Page 63 Manual Dimensions MS-00809-0100-3625 January 2024 Figure C-4: Mounting Figure C-5: Width Rosemount 625IR...
  • Page 64 Dimensions Manual January 2024 MS-00809-0100-3625 Figure C-6: Length and height Emerson.com...

  • Page 65: Appendix D Contact Support

    D  Contact support Prerequisites NOTICE If you have issues with the Rosemount 625IR, check Troubleshooting. Do not return the 625IR to the supplier for repair if you have not followed the troubleshooting procedure. Procedure 1. Contact your supplier/dealer to consult for troubleshooting in case the issue can be resolved without returning the product.
  • Page 66 Contact support Manual January 2024 MS-00809-0100-3625 Emerson.com...

  • Page 67: Appendix E Detecting Other Gases

    E  Detecting other gases Emerson calibrates the Rosemount 625IR and 625IR Duct for specific gases, but they are also sensitive to other specific gases. This is important to consider to avoid false alarms, but it can also be very useful to detect other hazardous gases.
  • Page 68 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.

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