Product Description
Details
GAS76 Tetrachloroethylene 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.
|
Performance |
|
Measuring Range |
1 to 10 ppm |
|
Number of Pump Stroke |
4 |
|
Correction Factor |
1 |
|
Sampling Time |
1.5 minutes per pump stroke |
|
Detecting Limit |
0.25 ppm (n=4) |
|
Colour Change |
Pink Pale Yellow |
|
Reaction Formula |
Tetrahydrothiophene reduces permanganate |
|
Coefficient of Variation |
10% (for 1 to 3 ppm), 5% (for 3 to 10 ppm) |
|
Shelf Life |
2 Years |
|
Corrections for |
Temperature correction is necessary |
|
Store the tubes at cool and dark place. |
|
|
Possible coexisting substances and their interferences |
|
|
Substance |
Concentration |
Interference |
Change colour by itself |
|
Ethyl Mercaptan |
≤1ppm |
No |
Discolour whole layer to pale pink |
|
Ethylene |
≤1000 ppm |
No |
Discolour whole layer to pale pink |
|
Propylene |
≤500 ppm |
No |
Discolour whole layer to pale pink |
|
Methanol |
≤300 ppm |
No |
Discolour whole layer to pale pink |
|
Hydrogen Sulphide |
≤30 ppm |
No |
Discolour whole layer to pale pink |
|
Calibration gas generation |
Diffusion tube method |
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