XgardIQ LPG sensor module
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1. Product: Xgard IQ Sensor Module Subject: Technical Specification Document reference: M071031 Issue 1 March 2016 Product: XgardIQ Sensor Module P art Number: XIQ - BW Gas Type: LPG (Liquid Petroleum Gas) Sensor Technology: Pellistor Environmental Specification: Temperature Range: +4 0ºC to + 7 5ºC Humidity Range for Operation/Storage: 0 to 99 %rh non - condensing . Recommended Storage Temperature 20ºC Warranty Period: 12 months if operated within stated environmental limits and not exposed to excessive gas concentrations or contaminants (see Product Notes) . Pressure Range: Atmospheric +/ - 10% Performance Characteristics: Expected Operating Life: > 36 months in air if operated within stated environmental limits and not exposed to excessive gas concentrations or contaminants (see Product Notes). Storage Life: 6 months from date of manufacture. T90 Response Time: ~ 35 sec onds Minimum Display Resolution : 1%LEL Linearity < 3 % of full - scale Long Term Sensitivity Drift: < 5 % per year Configuration: XgardIQ Display Name: LPG Range: 0 - 100%LEL Maximum User - Selectable Range: 0 - 100%LEL Minimum Recommended User - Selectable Range: 0 - 20%LEL Alarm 1 Threshold 20%LEL Alarm 2 Threshold 40%LEL Stabilisation Time 60 seconds
2. Product Notes and Calibration Instructions: Crowcon recommends LPG sensors are initially calibrated on commissioning and re - calibrated every 6 months . Please refer to the XgardIQ i nstallation, operating and maintenance instructions for information on performing sensor zero and calibration. Crowcon recommends calibration is performed using 0.8% vol. ( 50%LEL ) LPG ( mix of 70% Propane, 30% Butane ) in air at a flow - rate of 0.5 - 1 litre per minute . The sensor must be zeroed in clean air before calibration is performed. Note: The ratio of propane and butane (and other gases) in LPG may vary in some countries , or at different times of the year . Sensor response will not be signific antly affect ed. XgardIQ allows cross - calibration using easily obtainable and usable vapours where the target gas is impractical for calibration. When using the Calibration menu, the user will be offered a choice of calibrating with the target gas (ie LPG ) , or two others (propane and p entane). The cross - calibration gas must be applied in the concentration shown on - scree n: in this case 0.85% (50%LEL) p r opane or 0.55% (50%LEL) p entane; XgardIQ will automatically calibrate so that the sensor respond s correctly to LPG . The correction factors are detailed below for reference, however these are already stored in the sensor module configuration and thus the user just needs to choose the gas type. Note: if a dust filter accessory is fitted to the sensor, calibration must be performed with the filter in - place. Filters must be inspected regularly and replaced as soon as they show signs of contamination. A dust filter will affect the T90 response time of the sensor: response time may be significantly longer than shown on this datasheet. Note: Pellistors can suffer from loss of sensitivity if exposed to poisons or inhibitors such as silicones, sulphides, chlorine, lead or halogenated hydrocarbons. Sensors must be tested regularly with gas to verify response. In applications where such compounds are present we recommend the use of infrared flammable gas sensors. The operational life of the pellistors depends on the application and the amount of gas and contaminants to which the pellistor has been exposed. Under no rmal conditions (6 monthly calibration with periodic exposure to calibration gas) the life expectancy is 3 - 5 years. The sinter should be inspected regularly; a blockage may prevent gas reaching the sensor. Note: modules will be calibrated with a 70%/30% Pr opane/Butane LPG gas mixture where 100% LEL LPG = 1.61 % vol ume in air . Measured Cross Calibration Data : 0.85% Vol . (50% LEL) Propane (C 3 H 8 ) = 51.5 % LEL LPG . Cross c a libration f actor = 1.03 0.55% Vol . (50%LEL) Pentane (C 5 H 12 ) = 3 9 %LEL LPG . Cross c al ibration f actor = 0. 78 Note: The cros s cal ibration factors have been measured at 20 ̊C (nominally) and at 50%LEL concentration of the gases specified above. Safety Information : XgardIQ sensor modules are designed to detect gases or vapours in air, and not inert or oxygen deficient atmospheres. Maintenance and calibration operations must be performed by qualified service personnel. Disclaimer: The data contained on this document is provided for guidance purposes only and is correct at the time of issue. Performance d ata is typical as measured at Crowcon; no guarantees can be made on the performance of individual products. Environmental specifications are specific to the sensor listed, and may differ from those shown on the gas detector datasheet.
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