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GAS4M Hydrogen Sulphide Gastec Detector Tubes 12.5 – 500ppm
GAS4M Hydrogen Sulphide (H2S) 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||12.5 to 25 ppm||25 to 250 ppm||250 to 500 ppm|
|Number of Pump Strokes||2||1||1/2|
|Sampling Time||30 seconds per pump stroke|
|Detecting Limit||2.5 ppm (n=2)|
|Colour Change||White Brown|
|Reaction Principle||Hydrogen Sulphide reacts with Lead Acetate to form Lead Sulphide, which colour is brown.
H2S + Pb(CH3COO)2 PbS + 2CH3COOH
|Coefficient of Variation||5% (for 25 to 250 ppm)|
|Shelf Life||3 Years|
temperature & humidity
|Store the tubes at cool and dark place.|
|Possible coexisting substances and their interferences|
|Substance||Concentration||Interference||Change colour by itself|
|Nitrogen Dioxide||≥1/4 time||Minus error||No discoloration|
|Sulphur Dioxide||≥1/1 time||Plus error||No discoloration|
|Mercaptans||–||No effect||No discoloration|
|Calibration gas generation||Permeation tube method|
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