Indicator: 1 to 14 ppm
Measuring Range:
+ 0.4 to 1 ppm, Number of Pump Strokes 2
+ 1 to 14 ppm, Number of Pump Strokes 1
+ 14 to 40.6 ppm, Number of Pump Strokes 1/2 (45 seconds per of pumb stroke)
Sampling Time: 1.5 minute per pump stroke
Colour Change: Yellow → Reddish brown
Reaction Principle: CH2:CCl2 + Cr6+ + H2SO4 → HCl, HCl+ Base → Reddish brown product
Coefficient of Variation: 10% (for 1 to 4 ppm), 5% (for 4 to 14 ppm)
Nr. of tests: 5
Pump: GV-100S/110S
Catalog
Manual
Performance
| Measuring Range |
| 0.4 to 1 ppm |
1 to 14 ppm |
14 to 40.6 ppm |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
| 1.5 minutes per pump stroke |
45 seconds |
|
| Detecting Limit |
0.1 ppm (n=2) |
| Colour Change |
Yellow → Reddish brown |
| Reaction Principle |
CH2:CCl2 + Cr6+ + H2SO4 → HCl
HCl+ Base → Reddish brown product |
| Coefficient of Variation |
10% (for 1 to 4 ppm), 5% (for 4 to 14 ppm) |
| Shelf Life |
2 Years |
| Corrections for temperature & humidity |
Unnecessary |
| 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 |
| Ethylene |
≧ 300 ppm |
 |
No |
| Vinyl chloride |
≧ 1/7 |
+ |
Reddish brown |
| Tetrachloroethylene |
≧ 4 times |
+ |
Reddish brown |
| Trichloroethylene |
≧ 1/1 |
+ |
Reddish brown |
| Toluene |
≧ 500 ppm |
|
No |
| Benzene |
≧ 400 ppm |
|
No |
| Calibration gas generation |
Permeation tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 5 ppm(2014) |
- |
5.6 to 11.4% |
