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GAS152D Methyl Ethyl Ketone Passive Dosi-Tube 2 – 600ppm
GAS152D Methyl Ethyl Ketone 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 holder (GAS710) which is worn on a garment of clothing.
|Measuring Range||2 to 600 ppm|
|Sampling Hours||1 to 10 hours|
|Detecting Limit||2 ppm (10 hours)|
|Colour Change||Yellow Reddish Brown|
|Reaction Principle||Methyl Ethyl Ketone reacts with Hydroxylamine Phosphate to liberate
Phosphorus acid, which discolours pH indicator to reddish brown.
3CH3COC2H5 + (NH2OH)3H3PO4 H3PO4
H3PO4 + Base Phosphate
|Coefficient of Variation||10% (for 20 to 600 ppm-hr)|
|Shelf Life||Up to 2 years from point of manufacture|
temperature & humidity
|Temperature correction is necessary|
|Store the tubes in the refrigerator to keep at 10oC (50oF) or below.|
Possible coexisting substances and their interferences
|Substance||Concentration||Interference||Change colour by itself|
|Aldehydes||–||Plus error||Discolours reddish brown|
|Ketones||–||Plus error||Discolours reddish brown|
|Acid gases||–||Plus error||Discolours reddish brown
|Calibration gas generation||Diffusion tube method|
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