SIMRAD GD10P - IR GAS DETECTOR - ICEWeb

24Converting % LEL to % v/v is based on ISO10156, Second edition1996-02-15: “Gases and gas mixtures - Determination of fire potentialand oxidizing ability for the selection of cylinder valve outlets”.The GD10P is designed for normal atmosphere pressure variation, butit is certified for pressure limits from 86 to 108 kPa.5.3.2 Cross interference to other gasesHydrocarbon gases such as methane, ethane, propane and butaneare absorbing at a signal wavelength of 3.3 μm. These gases do notinterfere at the reference wavelength at 3.0 μm. If the atmosphere tobe monitored contains gases such as acetylene that absorb at thereference wavelength of 3.0 μm, misleading measurements may beobtained depending on the interfering gas concentration. In suchcases, contact Simrad Optronics for information. A modified GD10Pusing another reference wavelength will eliminate these problems.Water vapour, carbon dioxide, oxygen, nitrogen and other gases,which are present in normal air will not influence the measurements.5.4 Gas detection systemSince the GD10P is a point detector, it must be mounted where gasleakage is most likely to occur. It should be considered whether thegas in question is heavier or lighter than air. The number of sensorsrecommended depends on room size, shape, airflow and so on. TheGD10P can also be mounted on or through an air duct wall. For thispurpose, duct mounting kits are available.Due to high reliability and extensive self-testing, the GD10Pdramatically reduces the number of sensors needed, and votingbetween sensors is no longer necessary. As a result, maintenanceroutines can be relaxed without losing system confidence and repairwork is reduced to a minimum.For detailed mounting descriptions, see section 2.1