GAS174D Butadiene-1,3 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||1.3 to 200 ppm|
|Sampling Hours||1 to 8 hours|
|Detecting Limit||1.3 ppm (8 hours)|
|Colour Change||Reddish purple Pale brown|
|Reaction Principle||Butadiene reacts with Permanganate to produce light brown reaction product.
CH2:CHCH:CH2 + MnO4 (Reddish purple) Pale brown product
|Coefficient of Variation||10% (for 10 to 200 ppm∙hr)|
|Shelf Life||Up to 2 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|
|Unsaturated hydrocarbons||–||Plus error||Produce pale brown discoloration|
Other substances measurable with this detector tube
|Ethylene||Factor: 1.2||1.56 to 240 ppm|
|Vinyl Chloride||Factor: 1.2||1.56 to 240 ppm|
|Isoprene||Factor: 2.0||2.6 to 400 ppm|
|Trans-1,2-Dichloroethylene||Factor: 3.0||3.9 to 600 ppm|
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