Gastec 230H Quick-measuring Detector tubes Methyl Iodide CH3I (100 ~ 34800 ppm)
ManufacturerGastec(View more products from this manufacturer)
Model230H
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Indicator: 100 to 6000 ppm
Measuring Range:
+ 100 to 6000 ppm , Number of Pump Strokes 2
+ 6000 to 15000 ppm, Number of Pump Strokes 1
+ 15000 to 34800 ppm , Number of Pump Strokes 1/2
Sampling Time: 1. 5 minute per pump stroke
Colour Change: White →Dark brown
Reaction Principle: CH3I + I2O5 → I2
Coefficient of Variation: 5% (for 100 to 6000ppm)
Nr. of tests: 10
Pump: GV-100S/110S
Performance
| Measuring Range | 100 to 6000 ppm | 6000 to 15000 ppm | 15000 to 34800 ppm |
| Number of Pump Strokes | 2 | 1 | 1/2 |
| Correction Factor | 1 | 2.5 | 5.8 |
| Sampling Time | 1.5 minutes per pump stroke | ||
| Detecting Limit | 5ppm (n=2) | ||
| Colour Change | White →Dark brown | ||
| Reaction Principle | CH3I + I2O5 → I2 | ||
| Coefficient of Variation | 5% (for 100 to 6000ppm) | ||
| Shelf Life | 2 Years | ||
| Corrections for temperature & humidity | Temperature correction is necessary | ||
| Store the tubes at cool and dark place. | |||
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Carbon monoxide |  20ppm |
+ | Pale brown (pale green at the end of staining) |
| Carbon dioxide | No | No | |
| Ethylene | + | Pale yellow | |
| Hexane | + | Pale orange |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 2 ppm | - | - |
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