Gastec 233 Quick-measuring Detector tubes Hydrazine N2H4 (0.045~22ppm)
Indicator: 0.5 to 10 ppm
Measuring Range:
+ 0.045 to 0.1 ppm, Number of Pump Strokes 2
+ 0.1 to 10 ppm, Number of Pump Strokes 1
+ 10 to 22 ppm, Number of Pump Strokes 1/2
Sampling Time: 2 minute per pump stroke
Colour Change: White → Yellow
Reaction Principle:
+ CCl3NO2 + I2O5 + H2S2O7 → COCl2
+ COCl2 + (CH3)2NC6H4CHO → (CH3)2NC6H4CHCl2 + CO2
+ (CH3)2NC6H4CHCl2 + (C6H5)2NH→ Reaction product
Coefficient of Variation: 10% (for 0.1 to 3.0 ppm), 5% (for 3.0 to 10.0 ppm)
Nr. of tests: 5
Pump: GV-100S/110S
| Measuring Range | 0.045 to 0.1 ppm | 0.1 to 10 ppm | 10 to 22 ppm |
| Number of Pump Strokes | 2 | 1 | 1/2 |
| Correction Factor | 0.45 | 1 | 2.2 |
| Sampling Time | 2 minutes per pump stroke | ||
| Detecting Limit | 0.03 ppm (n=2) | ||
| Colour Change | White → Yellow | ||
| Reaction Principle |
CCl3NO2 + I2O5 + H2S2O7 → COCl2 |
||
| Coefficient of Variation | 10% (for 0.1 to 3.0 ppm), 5% (for 3.0 to 10.0 ppm) | ||
| Shelf Life | 1 Year | ||
| Corrections for temperature & humidity | Unnecessary | ||
| Store the tubes at cool and dark place. | |||
| Substance | Concentration | Interference | Change colour by itself to |
| Ammonia | No | No discolouration | |
| Carbon Dioxide | No | No discolouration | |
| Carbon Monoxide |  10ppm |
 |
No discolouration |
| Ethylene Oxide | No | No discolouration | |
| Formaldehyde | No | No discolouration | |
| Hydrogen Cyanide | No | No discolouration | |
| Bromomethane | 2ppm |
+ | Yellow ( 2 ppm) |
| Phosphine | No | No discolouration | |
| Sulphuryl Fluoride | No | No discolouration | |
| 1,2-Dichloroethane | No | No discolouration | |
| Benzene | No | No discolouration | |
| Toluene | No | No discolouration |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 0.1 ppm(2013) | - | - |
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