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GAS3D Ammonia Passive Dosi-Tube 2.5 – 1000ppm
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.
|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|
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|
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