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SKU: GAS6L Categories: ,

GAS6L Water Vapour Gastec Detector Tubes 0.05 – 2mg/l

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SKU: GAS6L Categories: ,


GAS6L Water Vapour (H2O) Standard Gastec Detector Tubes

Gas detector tubes are glass tubes that are filled with chemical reagent that absorbs and reacts with the target gas or vapour being measured.

A colorimetric stain (a colour change) is created. For most tubes, the concentration is read directly from the pinpoint accurate measurement scale on each tube.

This makes this form of monitoring ideal for spot sampling as it can be more accurate then electronic gas detectors.

The Gastec detector tube system is comprised of a handheld Gastec air sampling pump and Gastec detector tubes.

Measuring Range 0.05 to 1 mg/l 1 to 2 mg/l
Number of Pump Strokes 1 1/2
Correction Factor 1 2
Sampling Time 30 seconds per pump stroke
Detecting Limit 0.03 mg/l (n=1)
Colour Change Yellow        Purple
Reaction Principle Water vapour is absorbed by reagent to produce alkaline to discolour the indicator to purple.

H2O + Mg(ClO4)2               Mg (ClO4)2 H2O

Coefficient of Variation 10% (for 0.05 to 0.2 mg/l), 5% (for 0.2 to 1 mg/l)
Shelf Life 3 Years
Corrections for temperature & humidity Unnecessary
Store the tubes at cool and dark place.


Possible coexisting substances and their interferences
Substance Concentration Interference Change colour by itself
Alcohols Unclear demarcation Purple stain (Whole layer)
Aldehydes Unclear demarcation Purple stain (Whole layer)
Ketones Unclear demarcation Purple stain (Whole layer)
Nitriles Unclear demarcation Purple stain (Whole layer)
Hydrocarbons No effect No discoloration
Nitrogen dioxide No effect No discoloration
Sulphur dioxide 100 ppm Plus error No discoloration
Ammonia 10 ppm Unclear demarcation Yellowish green
Calibration gas generation Diffusion tube method

Additional Information

Weight 0.1 kg
Multi Gas Tags

Gas Range



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