Indicator: 2 to 20ppm
Measuring Range:
+ 0.5 to 1ppm, Number of Pump Strokes 4
+ 1 to 20ppm , Number of Pump Strokes 2
+ 20 to 46ppm , Number of Pump Strokes 1
+ 46 to 108ppm, Number of Pump Strokes 1/2
Sampling Time: 1.5 minute per pump stroke
Colour Change: White → Gray
Reaction Principle: CH3I + I2O5 + V2O5 + H2SO4 → I2
Coefficient of Variation: 5% (for 1 to 20ppm)
Nr. of tests: 10
Pump: GV-100S/110S
Catalog
Manual
Performance
| Measuring Range |
0.5 to 1ppm |
1 to 20ppm |
20 to 46ppm |
46 to 108ppm |
| Number of Pump Strokes |
4 |
2 |
1 |
1/2 |
| Correction Factor |
0.5 |
1 |
2.3 |
5.4 |
| Sampling Time |
1.5 minutes per pump stroke |
| Detecting Limit |
0.2ppm (n=4) |
| Colour Change |
White → Gray |
| Reaction Principle |
CH3I + I2O5 + V2O5 + H2SO4 → I2
I2 + 3,3,5,5-Tetramethylbenzidine ｢ｪ Reaction Products |
| Coefficient of Variation |
5% (for 1 to 20ppm) |
| Shelf Life |
2 Year |
| 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 |
| Chlorine |
 1/1 |
+ (Two layers) |
Brown (turns pale blue after a few minutes) |
| Nitrogen dioxide |
1/1 |
 (Two layers) |
Pink |
| Methyl bromide |
 30 ppm |
No |
No |
| Dichloromethane |
50 ppm |
No |
No |
| Carbon dioxide |
1% |
No |
No |
| Calibration gas generation |
Diffusion tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 2 ppm (2014) |
- |
- |
