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6.4
WATER VAPOR TUBES 5-160 MG/M3
Available on request:
- in PPM range
- in a range of 2-200 MG/M3
The reading is obtained directly off the tube in parts per million.
NOTE: High water vapor levels can affect the accuracy of the reading (see note below).
General Information and Cautions
• The measurement result applies only to the sampled portion i. e. for the expanded portion of air. In
order to validate the water content of the total air in compressed air system, variations in place and
time resulting from surface adsorption and desorption processes must be taken into account. Such
processes are strongly dependent on temperature.
• The white mist appearing at the air outlet of detector tube during measurement is caused by an
emission
of small droplets of sulfuric acid with the air flow. The amount is very slight. Any irritations will not
happen.
• Used detector tubes without any color change cannot be used repeatedly.
Influence of Temperature
• Detector tubes can be used between 0 °C and 35 °C (32 °F and 95 °F).
The calibration scales on detector tube are exactly valid if tubes have a temperature of 20 °C (68 °F)
during measurement. If detector tube temperature deviates from 20 °C (68 °F), multiply reading
(mg/m3) with appropriate correction factor (see table).
Normally, detector tube temperature is equivalent to ambient temperature.
Table 9: Correction factors
Temperature of detector tube (°C)
Temperature of detector tube (°F)
Correction factor
Overall Uncertainty
Up to ± 15 % in the range above 50 mg/m3 (5 l sample) resp. 20 mg/m3 (10 l sample).
Up to ± 25 % in the range 20 mg/m3 ... 50 mg/m3 (5 l sample) resp. 5 mg/m3 ... 20 mg/m3 (10 l
sample). (expressed as relative standard deviation).
Storage and Transport
Up to 25 °C (77 °F) and protected from light. Expiration date: see back of package.
Safety Advice/ Disposal
For tubes contents the following indications of danger apply: R: 20/21/22-35-37.
Safety advice S: 2–23-24/25-26-28 (water).
Tubes must be kept away from unauthorized persons. For disposal of tubes as waste observe the legal
regulations applicable in the individual country of use.
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WatchGas B.V.
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T: +31 (0) 85 0187709
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