- 103 - GD-70D
10-6 Calibrating with a Humidifier (MOS Sensors)
The calibration instructions in this section apply ONLY to the sensors listed in the table below. If your
sensor is not listed in the table below, you will need to follow the instructions outlined in one of the other
calibration sections.
The dry gas from a gas cylinder must be humidified for the MOS sensor to respond properly. Failure to
humidify gas from a cylinder will result in an artificially low response and an inaccurate calibration.
Calibration Gas/
Concentration
C2H2 (Acetylene) 0 - 2,000 ppm Hydrogen (H2): 500 ppm 1000 ppm
C2H2Cl2 (Dichloroethene) 0 - 600 ppm Hydrogen (H2): 4000 ppm 350 ppm
C2H4 (Ethylene) 0 - 2,000 ppm Hydrogen (H2): 1000 ppm 1000 ppm
C2H5OH (Ethanol) 0 - 2,000 ppm Hydrogen (H2): 1000 ppm 500 ppm
C3H6 (Propylene) 0 - 5,000 ppm Hydrogen (H2): 4000 ppm 1000 ppm
C3H8 (Propane)
0 - 5,000 ppm Propane (C3H8): 2100 ppm 2100 ppm
C4F6 (Hexafluorabutadiene) 0 - 200 ppm Hydrogen (H2): 100 ppm 130 ppm
CH2Cl2 (Dichloromethane) 0 - 2,000 ppm Isobutane (C4H10): 3600 ppm 1000 ppm
CH3CN (Acetonitrile) 0 - 2,000 ppm Isobutane (C4H10): 1800 ppm 1000 ppm
CH3OH (Methanol) 0 - 1,000 ppm Hydrogen (H2): 1000 ppm 800 ppm
0 - 2,000 ppm Hydrogen (H2): 1000 ppm 800 ppm
CH4 (Methane) 0 - 2% vol Methane (CH4): 5000 ppm (0.5% vol) 0.5% vol
0 - 2,000 ppm Methane (CH4): 1000 ppm 1000 ppm
0 - 5,000 ppm Methane (CH4): 5% LEL (2500 ppm) 2500 ppm
COS (Carbonyl sulfide) 0 - 2,000 ppm Hydrogen (H2): 5000 ppm 450 ppm
H2 (Hydrogen) 0 - 2.00% vol Hydrogen (H2): 1.20% vol 1.20% vol
0 - 500 ppm Hydrogen (H2): 200 ppm 200 ppm
0 - 1,000 ppm Hydrogen (H2): 500 ppm 500 ppm
0 - 2,000 ppm Hydrogen (H2): 1000 ppm 1000 ppm
0 - 4,000 ppm Hydrogen (H2): 2000 ppm 2000 ppm
IPA (Isopropyl alcohol) 0 - 2,000 ppm Isopropyl alcohol (IPA): 1000 ppm IPA 1000 ppm
R32 (Difluoromethane)
0 - 2,000 ppm Hydrogen (H2): 250 ppm 1000 ppm
0 - 5,000 ppm Hydrogen (H2): 1000 ppm 4000 ppm
R41 (Fluoromethane) 0 - 2,000 ppm Hydrogen (H2): 500 ppm 900 ppm
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