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Indicator: 1 to 100 ppm
Measuring Range:
+ 0.4 to 1 ppm, Number of Pump Strokes 4
+ 1 to 100 ppm, Number of Pump Strokes 2
+ 100 to 350 ppm, Number of Pump Strokes 1
Sampling Time: 3 minute per pump stroke
Colour Change: Yellow → Reddish brown
Reaction Principle: 15% (for 1 to 20 ppm), 10% (for 20 to 100 ppm)
+ C2H4O → 2HCHO,
+ 3HCHO + (NH2OH)3H3PO4 → H3PO4,
+ H3PO4 + Base → Phosphate
Coefficient of Variation:
Nr. of tests: 5
Pump: GV-100S/110S
| Measuring Range |
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| Number of Pump Strokes |
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| Correction Factor |
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| Sampling Time | 3 minutes per pump stroke | |||
| Detecting Limit | 0.1 ppm (n=4) | |||
| Colour Change | Yellow → Reddish brown | |||
| Reaction Principle | C2H4O → 2HCHO 3HCHO + (NH2OH)3H3PO4 → H3PO4 H3PO4 + Base → Phosphate |
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| Coefficient of Variation | 15% (for 1 to 20 ppm), 10% (for 20 to 100 ppm) | |||
| Shelf Life | 1 Year | |||
| Corrections for temperature & humidity | Temperature correction is necessary | |||
| Store the tubes in the refrigerator to keep at 10ºC (50ºF) or below. | ||||
| Substance | Concentration | Interference | Change colour by itself to |
| Aldehydes, Ketones | + | Reddish brown |
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| Epichlorohydrin | 1.2 | 2 | 1.2 to 120 ppm |
| Propylene oxide | 1.0 | 1 | 1 to 100 ppm |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 1 ppm(2014) | - | 3.0 to 100% |
