Gastec 91M Quick-measuring Detector tubes Formaldehyde HCHO (8~6400ppm)
ManufacturerGastec(View more products from this manufacturer)
Model91M
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Indicator: 20 to 2000 ppm
Measuring Range:
+ 8 to 20 ppm, Number of Pump Strokes 2
+ 20 to 2000 ppm, Number of Pump Strokes 1
+ 2000 to 6400 ppm, Number of Pump Strokes 1/2
Sampling Time: 1 minute per pump stroke
Colour Change: Yellow → Red
Reaction Principle: 3HCHO + (NH2OH)3H3PO4 → H3PO4, H3PO4 + Base → Phosphate
Coefficient of Variation: 10% (for 20 to 500 ppm), 5% (for 500 to 2000 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 minute per pump stroke | |||
| Detecting Limit | 4 ppm (n=2) | |||
| Colour Change | Yellow → Red | |||
| Reaction Principle | 3HCHO + (NH2OH)3H3PO4 → H3PO4 H3PO4 + Base → Phosphate |
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| Coefficient of Variation | 10% (for 20 to 500 ppm), 5% (for 500 to 2000 ppm) | |||
| Shelf Life | 2 Years | |||
| Corrections for 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 (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Acrolein | 5 times | + | Red ( 20 ppm) |
| Acetaldehyde | 1/6 time | + | Red ( 3 ppm) |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| - | C 0.3 ppm(2014) | 7.0 to 73% |
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