XgardIQ Ethanol sensor module
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3. Disclaimer: The data contained on this document is provided for guidance purposes only and is correct at the time of issue. Performance data 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.
1. Product: Xgard IQ Sensor Module Subject: Technical Specification Document reference: M07 0056 Issue 2 April 2016 Product: XgardIQ Sensor Module P art Number: XIQ - BD Gas Type: Ethanol ( C 2 H 6 O ) Sensor Technology: Pellistor Environmental Specification: Temperature Range: +1 0ºC to + 7 5ºC (see notes regarding ethanol flash - point) 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: ~ 23 sec onds Minimum Display Resolution : 1%LEL Linearity < 3 % of full - scale Long Term Sensitivity Drift: < 5 % per year Configuration: XgardIQ Display Name: Ethanol 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 e thanol sensors are initially calibrated on commissioning and re - calibrated every 6 months minimum. Please refer to the XgardIQ i nstallation, operating and maintenance instructions for information on performing sensor zero and calibration. Crowcon recommends calibration is performed where practical using 50%LEL e thanol ( C 2 H 6 O ) 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: Ethanol has a flashpoint of 12 - 13 ̊ Celsius; below this temperature decreasingly low vapour concentrations can be formed and detection and calibration become impractical. Even at ambient 20 ̊C ; liquid ethanol may have to be vaporised to enable calibration. XgardIQ allows cross - calibration using easily obtainable and usable vapours where the target gas is impractical for calibration. When u sing the Calibration menu, the user will be offered a choice of calibrating with the target gas (ie e thanol) , 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 e thanol. The correction factors are detailed below for reference, however these are already stored in the sensor module configuration and thus t he user just needs to choose the gas type and proceed. 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 normal conditions (6 monthly calibration with periodic exposure to calibration gas) the life expectancy is 3 - 5 years. The sinte r should be inspected regularly; a blocked sinter may prevent gas from reaching the sensor. Note: modules will be calibrated in com pliance with EN60079 - 20 - 1:2010 where 100% LEL ethanol = 3.1 % vol ume. Measured Cross Calibration Data : 0.85% Vol . (50% LEL) Propane (C 3 H 8 ) = 38% LEL Ethanol. Cross c a libration f actor = 0.76 0.55% Vol . (50%LEL) Pentane (C 5 H 12 ) = 30%LEL Ethanol. Cross c al ibration f actor = 0.6 Note: The cros s cal ibration factors have been measured at 20 ̊C (nominally) and at 50%LEL concentration of the gases specified above. Extrapolated ethanol readings may vary at higher temperatures. 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.
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