Description
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.
Performance |
Measuring Range | 2.5 to 1000ppm |
Sampling Hours | 0.5 to 10 hours |
Detecting Limit | 0.5ppm (10 hours) |
Colour Change | Purple Yellow |
Reaction Principle | Ammonia neutralizes analyzing agent to discolour the indicator to yellow. |
Coefficient of Variation | 10% (for 25 to 500 ppm・hr) |
Shelf Life | Up to 3 years from point of manufacture |
Corrections for temperature & humidity |
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 |
Amines, Hydrazine | – | Plus error | Produce yellow stain. |
Aromatic amines | – | No effect | No discoloration |
Other substance measurable with this detector tube | |||||
Substance | Correction Factor | Sampling Time | Measuring Range | ||
Dimethylamine | 0.75 | 0.5 to 10 hours | 1.9 to 750 ppm | ||
N,N-Dimethylethylamine | 1.6 | 4 to 1600 ppm | |||
Hydrazine | 0.65 | 1.6 to 650 ppm | |||
Triethylamine | 2.1 | 5.3 to 2100 ppm | |||
Calibration gas generation | Permeation tube method |
Additional Information
Weight | 0.1 kg |
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Multi Gas Tags | Ammonia (NH3), Dimethylamine ((CH3)2NH), Hydrazine (N2H4), N-N-Dimethylethylamine (C4H11N), Triethylamine ((C2H5)3N) |
Gas Range | |
Brand | |
Configuration |
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