Product Description
Details
GAS3D Ammonia (NH3) Gastec Passive Sampling Dosi Tubes (Time Weighted Average Detector Tubes)
The Dosi-Tube System allows an operator to evaluate the level of gas a worker is exposed to over a time period such as a working shift.
The Dosi-Tube is easily clipped into the Dosi-tube holder (GAS710) which is worn on a garment of clothing.
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Performance |
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Measuring Range |
2.5 to 1000ppm |
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Sampling Hours |
0.5 to 10 hours |
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Detecting Limit |
0.5ppm (10 hours) |
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Colour Change |
Purple Yellow |
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Reaction Principle |
Ammonia neutralizes analyzing agent to discolour the indicator to yellow. |
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Coefficient of Variation |
10% (for 25 to 500 ppm･hr) |
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Shelf Life |
Up to 3 years from point of manufacture |
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Corrections for |
Temperature correction is necessary |
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Store the tubes at cool and dark place. |
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Possible coexisting substances and their interferences |
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Substance |
Concentration |
Interference |
Change colour by itself |
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Amines, Hydrazine |
- |
Plus error |
Produce yellow stain. |
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Aromatic amines |
- |
No effect |
No discoloration |
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Other substance measurable with this detector tube |
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Substance |
Correction Factor |
Sampling Time |
Measuring Range |
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Dimethylamine |
0.75 |
0.5 to 10 hours |
1.9 to 750 ppm |
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N,N-Dimethylethylamine |
1.6 |
4 to 1600 ppm |
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Hydrazine |
0.65 |
1.6 to 650 ppm |
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Triethylamine |
2.1 |
5.3 to 2100 ppm |
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Calibration gas generation |
Permeation tube method |
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