Gas or Vapour
to be Measured
Chemical Formula
Gastec Tube
No. & Name
Measuring
Range
(ppm)
No.of
Pump
Strokes
Shelf
Life
(year)
Note TLV-
TWA,C
(ACGIH)
(ppm)
Water vapour
H2O
6 Water vapour 18-32 mg/L 1/2 3 T -
1-18 mg/L 1
0.5-1 mg/L 2
6L Water vapour 1-2 mg/L 1/2 3  
0.05-1 mg/L 1
6LP Pipeline Dew Point Tube 40-100LB/MMCF 1/2 3 T
3-40 LB/MMCF 1
6LLP Pipeline Dew Point Tube 2-10 LB/MMCF 2 3 T
T:Temp Correction H:Humidity Correction *:Refrigerator Store Mesh:Correction Factor/Chart


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