Gastec 91L Quick-measuring Detector tubes Formaldehyde HCHO (0.1-40ppm)
ManufacturerGastec(View more products from this manufacturer)
Model91L
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Indicator: 0.2~5ppm
Measuring Range:
+ 0.1 ~ 5 ppm, Number of Pump Strokes 5
+ 5 ~ 40 ppm, Number of Pump Strokes 1
Sampling Time: 1.5 minute per pump stroke
Colour Change: Yellow → Reddish Brown
Reaction Principle: 3HCHO + (NH2OH)3H3PO4 → H3PO4, H3PO4 + Base → Phosphate
Coefficient of Variation: 10% (for 0.1 to 0.5 ppm), 5% (for 0.5 to 5 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 | 0.05 ppm (n=5) | ||
| Colour Change | Yellow → Reddish Brown | ||
| Reaction Principle | 3HCHO + (NH2OH)3H3PO4 → H3PO4 H3PO4 + Base → Phosphate |
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| Coefficient of Variation | 10% (for 0.1 to 0.5 ppm), 5% (for 0.5 to 5 ppm) | ||
| Shelf Life | 3 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 |
| Aldehydes | + | Reddish brown | |
| Ketones | + | Reddish brown | |
| Acid Gases | + | Red | |
| Organic acids | No | No |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| Diisobutyl ketone | 5.8 | 4 | 0.58 to 29 ppm |
| Methaldehyde | 0.65 | 3 | 0.065 to 3.25 ppm |
| Propionaldehyde | 7.6 | 1 | 0.76 to 38 ppm |
| Cyclohexanone | by scale | 1/2 | 10 to 470 ppm |
| Benzaldehyde | by scale | 1 | 4 to 92ppm |
| 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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