Indicator: 20 to 500 ppm
Measuring Range:
+ 10 to 20 ppm, Number of Pump Strokes 2
+ 20 to 500 ppm, Number of Pump Strokes 1
+ 500 to 1500 ppm, Number of Pump Strokes 1/2
Sampling Time: 30 seconds per pump stroke
Colour Change: White → Yellow
Reaction Principle: C6H5CH:CH2+ H2S2O7 → Condensation Polymer
Coefficient of Variation: 15% (for 20 to 100 ppm), 10% (for 100 to 500 ppm)
Nr. of tests: 10
Pump: GV-100S/110S
Catalog
Manual
Manual tube
Performance
| Measuring Range |
| 10 to 20 ppm |
20 to 500 ppm |
500 to 1500 ppm |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
30 seconds per pump stroke |
| Detecting Limit |
1 ppm (n=2) |
| Colour Change |
White → Yellow |
| Reaction Principle |
C6H5CH:CH2+ H2S2O7 → Condensation Polymer |
| Coefficient of Variation |
15% (for 20 to 100 ppm), 10% (for 100 to 500 ppm) |
| Shelf Life |
3 Years |
| Corrections for temperature & humidity |
Unnecessary |
| Store the tubes at cool and dark place. |
Possible coexisting substances and their interferences
(NOTE)
| Substance |
Concentration |
Interference |
Change colour by itself to |
| Alcohols |
≧ 0.5% |
+ (Bleaching) |
No |
| Esters |
≧ 0.5% |
+ (Bleaching) |
No |
| Ketones |
≧ 0.5% |
+ (Bleaching) |
No |
| Calibration gas generation |
Diffusion tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 20 ppm |
40 ppm |
1.1 to 6.1% |
