Gastec 92 Quick-measuring Detector tubes Acetaldehyde CH3CHO (5~750ppm)
ManufacturerGastec(View more products from this manufacturer)
Model92
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Indicator: 10 to 300 ppm
Measuring Range:
+ 5 to10 ppm, Number of Pump Strokes 4
+ 10 to 300 ppm, Number of Pump Strokes 2
+ 300 to 750 ppm, Number of Pump Strokes 1
Sampling Time: 1.5 minute per pump stroke
Colour Change: Yellow → Red
Reaction Principle: 3CH3CHO + (NH2OH)3H3PO4 → H3PO4, H3PO4 + Base → Phosphate
Coefficient of Variation: 10% (for 10 to 100 ppm), 5% (for 100 to 300 ppm)
Nr. of tests: 10
Pump: GV-100S/110S
Performance
| Measuring Range |
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| Number of Pump Strokes |
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| Correction Factor |
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| Sampling Time | 1.5 minutes per pump stroke | |||
| Detecting Limit | 2 ppm (n=4) | |||
| Colour Change | Yellow → Red | |||
| Reaction Principle | 3CH3CHO + (NH2OH)3H3PO4 → H3PO4 H3PO4 + Base → Phosphate |
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| Coefficient of Variation | 10% (for 10 to 100 ppm), 5% (for 100 to 300 ppm) | |||
| Shelf Life | 2 Years | |||
| Corrections for temperature & humidity | Unnecessary | |||
| Store the tubes in the refrigerator to keep at 10ºC (50ºF) or below. | ||||
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Ammonia |  |
No | |
| Acrolein | 3/5 times | + | Red |
| Acetone | 2 times | + | Red |
| Methyl ethyl ketone | 6 times | + | Red |
| MIBK | 10 times | + | Red |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| Diacetyl | by scale | 3 | 25 to 1500 ppm |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| - | C 25 ppm | 4 to 60% |
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