Gastec CH3CHO 92L 乙醛CH3CHO气体检测管 (1~20ppm)
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Indicator: 1~20ppm
Measuring Range: 1~20ppm
Sampling Time: 2 minutes per pump stroke
Colour Change: Yellow → Brown
Reaction Principle: 3CH3CHO + (NH2OH)3H3PO4 → H3PO4, H3PO4 + Base → Phosphate
Coefficient of Variation: 10% (for 1 to 6 ppm), 5% (for 6 to 20 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 | 2 minutes per pump stroke | |
| Detecting Limit | 0.2 ppm (n=1) | |
| Colour Change | Yellow → Brown | |
| Reaction Principle | 3CH3CHO + (NH2OH)3H3PO4 → H3PO4 H3PO4 + Base → Phosphate |
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| Coefficient of Variation | 10% (for 1 to 6 ppm), 5% (for 6 to 20 ppm) | |
| Shelf Life | 2 Years | |
| Corrections for temperature & humidity | Temperature correction is necessary | |
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Ammonia |  30 ppm |
No | No |
| Acetic acid |  2 times |
+ | Brown |
| Acids | + | Brown | |
| Aldehydes | + | Brown | |
| Ketones | + | Brown |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| - | C 25 ppm | 4 to 60% |
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