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GAS91D Formaldehyde Passive Dosi-Tubes 0.1 – 20ppm
Description
GAS91D Formaldehyde 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 | 0.1 to 20 ppm |
| Sampling Hours | 1 to 10 hours |
| Detecting Limit | 0.05 ppm (10 hours) |
| Colour Change | Yellow Reddish Brown |
| Reaction Principle | Formaldehyde reacts with hydroxylamine phosphate to liberate Phosphorous acid, which discolours pH indicator to reddish brown. |
| Coefficient of Variation | 10% (for 1 to 20 ppm∙hr) |
| Shelf Life | Up to 1 year from point of manufacture |
| Corrections for temperature & humidity |
Unnecessary |
| Store the tubes in the refrigerator to keep at 10oC (50oF) or below. | |
| Possible coexisting substances and their interferences |
| Substance | Interference | Change colour by itself |
| Aldehydes, Ketones, Acid gases | Plus error | Discolours reddish brown |
| Other substance measurable with this detector tube | |||||
| Substance | Correction Factor | Sampling Time | Measuring Range | ||
| Acetaldehyde | 1.0 | 1 to 10 hours | 0.1 to 20 ppm | ||
| Furfural | 3.0 | 1 to 10 hours | 0.3 to 60 ppm | ||
| Methyl Ethyl Ketone | 1.25 | 1 to 10 hours | 0.125 to 25 ppm | ||
| Calibration gas generation | Diffusion tube method |
Additional Information
| Weight | 0.1 kg |
|---|---|
| Multi Gas Tags | Acetaldehyde (CH3CHO), Methyl Ethyl Ketone (MEK) (CH3COC2H5) |
| Gas Range | |
| Brand | |
| Configuration |
Product Downloads
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