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