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sewerin rmld Operating Instructions Manual

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  • Page 1 Operating Instructions...
  • Page 2 Measurable success by Sewerin equipment Congratulations. You have chosen a quality instrument manufactured by Hermann Sewerin GmbH. Our equipment will provide you with the highest standards of perform- ance, safety and efficiency. They correspond with the national and in- ternational guide-lines.
  • Page 3 Operating Instructions RMLD Remote Methane Leak Detector 31.01.2007 – 105713 – en...
  • Page 4 V in this manual if the device does not work correctly or in- dicates a fault or warning. Warning! Do not switch on or use the RMLD indoors if there is any indication, possibility or suspicion that an explosive level of gas may be present.

  • Page 5: Table Of Contents

    Using the Pure Tone mode ............18 Self-test and calibration ............19 3.7.1 Calibration override ..............22 Section IV (Monitoring with the RMLD) .......24 Monitoring with the RMLD ............24 Long range scanning ...............27 Dealing with false detections ...........28 How does the RMLD measure gas concentrations? ....29...
  • Page 6 Contents Page Section V (Maintenance and troubleshooting) ....33 Troubleshooting the device .............33 Maintenance ................37 Appendix ................38 Glossary ..................38 Daily log of RMLD self-test and calibration ......40...

  • Page 7: Overview

    Using the RMLD, it is now possible to monitor areas that are hard to reach or are not easy to access. The use of TDLAS (Tunable Diode Laser Absorption Spectroscopy) laser technology means that the RMLD does not need to be located directly in the gas plume.
  • Page 8 Gas plumes are variable in nature and depend on the soil condi- tions, temperature, wind, and leak rate. The RMLD consists of two main components that interact with each other: Transceiver  Controller  Figure 1-3: The RMLD system consists of a laser transmitter/receiver and a controller...
  • Page 9 The RMLD can be operated in a wide variety of environmental conditions, including cold and hot weather and light rain. Its rug- ged design will withstand normal field use and operating condi- tions.

  • Page 10: Section I (System Description)

    Section I (System description) Technical data for the RMLD system Detection method: TDLAS (Tunable Diode Laser Absorption Spectroscopy) Measurement range: 0 to 99,999 ppm•m Sensitivity: 5 ppm•m at a distance of 0 to 15 m Min. 10 ppm•m at a distance of 15 to...
  • Page 11 Laser safety (eye CDRH, ANSI and IEC protection): IR detection laser  – Class I Green spotter laser  – Class IIIa: Do not look into the beam or view directly using optical instru- ments. Display: Large, easy to read display with backlight (0.75 inch, numeric) Operating -17 °C to 50 °C...

  • Page 12: Rmld System Components

    RMLD system components This section describes the features of the RMLD. Please refer to Figure 1-4 for illustrations of individual parts. Figure 1-4: System components 1.2.1 Controller The controller provides the user interface, menu selection keys, and external connections including: RS-232 port, battery charger port, external power supply port, headphone port, and power switch.

  • Page 13: Carrying Strap

    1.2.3 Carrying strap The RMLD comes complete with a single carrying strap, includ- ing shoulder pad. An optional dual shoulder strap harness is also available. 1.2.4 Charger A battery charger is supplied with the device for recharging the bat- tery. The charger is a universal charger, 110–240 V/AC, 50/60 Hz, and features a charge indicator.

  • Page 14: Optional Accessories

    SEWERIN recommends the use of this har- ness by all personnel who operate this equipment for extended periods, in order to limit fatigue when holding the transceiver and to improve monitoring technique.

  • Page 15: Section Ii (Battery Charging)

    Section II (Battery charging) Rechargeable battery The RMLD is fitted with an internal lithium-ion battery that provides the main source of power for the device. This battery is designed to provide 8 hours of device operation when fully charged. The battery must be recharged every time the device is not in use in order to guarantee uninterrupted use of the device.

  • Page 16: Charger

    To prevent damage to the battery or electrical cir- cuits, always plug the charger into a surge-protected socket. Charger The RMLD is supplied with a universal AC battery charger. The plug on the charger can be changed according to the type of socket available. Charging procedure Carry out the following procedure to recharge the internal bat- tery.

  • Page 17: Section Iii (Operating The Rmld)

    Section III (Operating the RMLD) The section provides information on operating the RMLD. This includes an explanation of how to use the menu, how to set op- erational parameters, and the procedures for activating various features of the device. 13 14 Figure 3-1 RMLD front panel with display.
  • Page 18 8 Volume Shows the volume level for the loud speaker and headphones. 9 WARNING symbol This symbol indicates that the device is operating outside functional limits. 10 ERROR symbol This symbol indicates a fault i.e. the device is not functioning correctly. 11 Backlight symbol This symbol indicates that the backlight is switched on.

  • Page 19: Switching On The Rmld

    Figure 3-2: RMLD rear panel HEADPHONE port Socket for the headphone jack. CHARGER port Socket for the battery charger jack. POWER SWitch Pressing this switch turns the device on/off. External power Socket for the backup battery jack. supply connector, EXT. POWER...

  • Page 20: Switching On The Spotter Laser

    Note: The infrared detection laser is always active and the device continuously monitors methane concentra- tion whenever it is switched on. Switching on the spotter laser CAUTION! The green spotter laser is controlled by the operator and is only switched on when the spotter trigger is pressed.

  • Page 21: Switching Off The Rmld

    All settings will be saved automatically (e.g. alarm activation threshold, spotter active, etc.). Using the menus The RMLD allows the operator to set certain operational param- eters and to activate/deactivate functions. The following opera- tional parameters can be changed by the operator:...
  • Page 22 Press the up key to activate or deactivate the spotter laser  Press the up key to increase the alarm activation threshold  Press the down key to decrease the alarm activation thresh-  Figure 3-4 BACLI Press the up key to activate or deactivate the backlight for the ...

  • Page 23: Using Dmd Mode

    Even when the low light intensity warning signal is audible, the RMLD may still be able to detect very high gas concentrations; this situation is indicated by a higher pitched sound.

  • Page 24: Using The Pure Tone Mode

    Using the Pure Tone mode In “Pure Tone” mode, the RMLD will produce a continuous tone that is related to the instantaneous concentration level. The higher the pitch of the tone, the higher the methane concentration. If no sound is heard then this indicates low light intensity or a fault in the device.

  • Page 25: Self-Test And Calibration

    Self-test and calibration The RMLD features an integrated function for carrying out a self- test and calibrating the laser wavelength. The self-test function should be run on a daily basis to ensure trouble-free operation of the device.
  • Page 26 Proceed as described below to carry out the self-test and cali- bration. Remove the controller from the carrying case. Switch on the device and allow to warm up for 2 to 3 min- utes. Place the transceiver in the carrying case in the position de- signed for this purpose, ensuring that it is level and properly seated.
  • Page 27 What if the device failed to successfully complete the self- test or calibration? This is usually caused either by the transceiver being positioned incorrectly in the carrying case or by a drift in the laser wavelength. Ensure that the device is in the correct position, level and prop- erly seated.

  • Page 28: Calibration Override

    SEWERIN directly for assistance. Note: Laser wavelength drift is a normal characteristic of the RMLD. Normally, the magnitude of the drift is small and does not have any negative effect on the self-test, provided this is carried out regularly. Moni- toring work that is carried out using an uncalibrated device may have to be repeated.
  • Page 29 Check the calibration cell for signs of  damage. CAUTION! If the device does not successfully complete a self- test after several attempts, do not use the device for monitoring work before the problem has been rectified. Please contact SEWERIN directly for as- sistance.

  • Page 30: Section Iv (Monitoring With The Rmld)

    The purpose of the video is to familiarise personnel responsible for monitoring gas leaks with how to use the RMLD. The video does not provide any training in basic leak monitoring techniques.Please refer to your organisa- tion’s own training and procedural requirements for the specific...
  • Page 31 Below are some tips for patrolling the gas pipe on foot: Use a smooth sweeping motion.  Maintain a target distance for the beam of 5 to 7 m. This means  that the footprint of the beam on the ground is large enough to provide good coverage, while still giving good control over the path of the beam.
  • Page 32 Proceed as follows when scanning a gas meter: Maintain a distance of at least 3 m from the gas meter to ensure  that the beam width is not too narrow. Thoroughly scan the ground in the area around the meter. ...

  • Page 33: Long Range Scanning

    Long range scanning The RMLD can detect leaks at a distance of up to 30 m. The actual maximum distance may depend on the characteristics of the target surface and variations in environmental conditions. As the scanning distance is increased, the intensity of the reflected laser light will become lower.

  • Page 34: Dealing With False Detections

    Obstructions or changes in the landscape can create dark zones where it is not possible to scan with the laser. Look for the best angle from which to aim the laser in order to scan these areas thoroughly. Scanning upwards along a slope may lead to beam skipping or dark zones around the foundations of a structure.

  • Page 35: How Does The Rmld Measure Gas Concentrations

    How does the RMLD measure gas concentrations? The RMLD can be used to monitor areas that are hard to access. The use of TDLAS (Tunable Diode Laser Absorption Spectros- copy) laser technology means that the RMLD does not need to be located directly in the gas plume.
  • Page 36 500 ppm•m. By way of another example, consider a medium-concentration gas cloud of 20 ppm that is approximately 2 m wide; the RMLD will measure a value of 40 ppm•m plus, in this case, a background level of 15 ppm•m, meaning that a total value of 55 ppm•m is...
  • Page 37 5 m of more. Note: Atmospheric air always contains a low level of meth- ane. This natural background methane level is also measured by the RMLD. The ppm•m measurement value therefore increases as the scanning distance is increased.
  • Page 38 Note: The nature of gas plumes varies considerably. The illustrations above are only intended to give an illustrate the basic theory. With some leaks it is possible that there is a high surface methane con- centration, with little or no detectable gas plume above the ground.

  • Page 39: Section V (Maintenance And Troubleshooting)

    Section V (Maintenance and troubleshooting) Troubleshooting the device The advanced design of the RMLD makes it one of the most reli- able leak monitoring devices available today. However, should problems occur with the device, or if it is suspected that the device is not functioning correctly, then it should not be used for monitor- ing until the problem is rectified.
  • Page 40 Possible cause(s) Solution The override Laser calibration Run self-test daily   function has to be drift Contact SEWERIN  used every time Laser calibration  the self-test is run drift is too high The device will Battery not charged Charge the inter- ...
  • Page 41 Failure of an inter- perature has sta-  nal component bilised Make a note of the  error code and con- tact SEWERIN Battery indicator Battery not fully Charge the battery   shows that the charged until the green LED...
  • Page 42 Symptom Possible cause(s) Solution Bars on the Battery charge in- Run the device un-   battery indicator dicator calibration til is switches off are flashing error automatically, then charge the battery fully without inter- ruption...

  • Page 43: Maintenance

    Maintenance In order to maintain the RMLD in proper working order, the fol- lowing maintenance tasks must be carried out at the specified intervals. Maintenance task Interval Clean outer surfaces with a As required damp cloth Clean the transceiver window...

  • Page 44: Appendix

    IR beam suddenly changes. This may lead to a false detection. Controller The part of the RMLD carried on the body that includes the keypad and display Dark zone An area that is not scanned because it lies behind an obstruction.
  • Page 45 The laser light is partially absorbed when shone through a cloud of methane, thereby allowing the gas concentration to be measured. Transceiver The hand-held part of the RMLD that contains the invisible IR laser transmitter/receiver and the green spotter laser...

  • Page 46: Daily Log Of Rmld Self-Test And Calibration

    Daily log of RMLD self-test and calibration RMLD serial no.: ....Date Operator Self test Self test Alarm Notes suc- ppm•m activation cess- meas- threshold ful? urement value...
  • Page 47 Hermann Sewerin GmbH Robert-Bosch-Straße 3 · 33334 Gütersloh · Germany Telefon +49 5241 934-0 · Telefax +49 5241 934-444 www.sewerin.com · info@sewerin.com...

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