Indicator: 100 to 2000 ppm
Measuring Range:
+ 50 to 100 ppm, Number of Pump Strokes 2
+ 100 to 2000 ppm, Number of Pump Strokes 1
Sampling Time: 2 minutes per pump stroke
Colour Change: Pink → Pale blue
Reaction Principle: C2H5OH + Cr6+ + H2SO4 → Cr3+
Coefficient of Variation: 10% (for 100 to 500 ppm), 5% (for 500 to 2000 ppm)
Nr. of tests: 10
Pump: GV-100S/110S
Catalog
Manual
Manual tube
Performance
| Measuring Range |
| 50 to 100 ppm |
100 to 2000 ppm |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
2 minutes per pump stroke |
| Detecting Limit |
15 ppm (n=2) |
| Colour Change |
Pink → Pale blue |
| Reaction Principle |
C2H5OH + Cr6+ + H2SO4 → Cr3+ |
| Coefficient of Variation |
10% (for 100 to 500 ppm), 5% (for 500 to 2000 ppm) |
| Shelf Life |
3 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 |
| Alcohols |
|
+ |
Pale blue |
| Acetone |
 1000 ppm |
No |
No discolouration up to 1000 ppm |
| Ethyl Acetate |
500ppm |
No |
No discolouration up to 500 ppm |
| Toluene |
300ppm |
No |
No discolouration up to 300 ppm |
| Benzene |
70ppm |
No |
No discolouration |
| Calibration gas generation |
Diffusion tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| - |
1000ppm (2014) |
3.3 to 19% |
