Honeywell MIDAS Sensor Cartridge for Arsine (AsH3) 18-200 ppb, Germane (GeH4) 0-800 ppb



Honeywell MIDAS Sensor Cartridge for Arsine (AsH3) 18-200 ppb, Germane (GeH4) 0-800 ppb

Several Honeywell MIDAS® cartridges can be configured to read a number of different gases based on a common chemical family. Actual details for the sensor detection range are included in the sensor cartridge specification sheet and the MIDAS® technical manual. MIDAS® sensor cartridges can be ordered as part of a Kit with the universal MIDAS® transmitter, or as a replacement part. The detectable range is listed. With the exception of O2 (where ambient concentration is typically 20.9%), the sensors will display zero when no gas is present. All Cartridges with the format MIDAS-E-XXX are supplied with a 2 year (24 month) warranty.
Gas MeasuredMeasured Arsine (AsH3)
Cartridge Part NumberMIDAS-E-ASH2 year extended warranty
Sensor Technology3 electrode electrochemical cell
Measuring Range (ppm)AsH30 – 0.2 ppm
Minimum Alarm 1 Set Point0.025 ppm
Repeatability< ± 2% of measured value
Linearity< ± 10% of measured value
Response Time t62.5< 15 seconds
Sensor Cartridge Life Expectancy≥ 24 months under typical application conditions
Operating Temperature0°C to +40°C (32°F to 104°F)
Effect of TemperatureZero< ± 0.004 ppm / °C (0° to 40°C)
Sensitivity< ± 0.9% of measured value / °C
Operating Humidity (continuous)10 – 95% rH non-condensing
Effect of HumidityZeroInitial short term drift at abrupt rH change (< 0.001 ppm / % rH)
Sensitivity< ± 0.2% of measured value / % rH
Operating Pressure90 – 110kPa
Effect of PositionNo effect in typical application
Long Term DriftZero< 0.05 ppm / year
Sensitivity< 5% of measured value / 6 months
Calibration GasArsine (AsH3)
Challenge Gas (Bump Test)Phosphine (PH3)
Warm Up Time< 20 minutes
Storage Temperature+5°C to +25°C (+41°F to +77°F)
0-0.2 ppm0.025 ppm
GeH40-0.8 ppm0.095 ppm
Cross Sensitivities

Each Midas sensor is potentially cross sensitive to other gases and this may cause a gas reading when exposed to other gases than those originally designated. The table below presents typical readings that will be observed when a new sensor cartridge is exposed to the cross sensitive gas (or a mixture of gases containing the cross sensitive species).
Gas / VaporChemical FormulaConcentration applied (ppm)Reading (ppm AsH3)
Carbon DioxideCO25,0000
Carbon MonoxideCO850
Hydrogen ChlorideHCI7.90
Hydrogen CyanideHCN3.60.2
Hydrogen FluorideHF7.20
Hydrogen SelenideH2Se0.80.24
Hydrogen SulfideH2S18.20
Iso PropanolC3H2OH20,0000
Nitrogen DioxideNO210-2.2
Sulfur DioxideSO217.80

Additional information

Weight 1 lbs