Indicator: 2 to 20 ppm
Measuring Range:
+ 2 to 20 ppm, Number of Pump Strokes 2
+ 20 to 50 ppm, Number of Pump Strokes 1
+ 50 to 100 ppm, Number of Pump Strokes 1/2
Sampling Time: 45 seconds per pump stroke
Colour Change: White → Brown
Reaction Principle: HCHO + C6H4(CH3)2 + H2S2O7 → Condensation Polymer
Coefficient of Variation: 15% (for 2 to 6 ppm), 10% (for 6 to 20 ppm)
Nr. of tests: 10
Pump: GV-100S/110S
Detail
Catalog
Manual
Performance
| Measuring Range |
| 2 to 20 ppm |
20 to 50 ppm |
50 to 100 ppm |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
45 seconds per pump stroke |
| Detecting Limit |
0.5 ppm (n=2) |
| Colour Change |
White → Brown |
| Reaction Principle |
HCHO + C6H4(CH3)2 + H2S2O7 → Condensation Polymer |
| Coefficient of Variation |
15% (for 2 to 6 ppm), 10% (for 6 to 20 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 |
| Aldehydes |
1/2 time |
+ |
Brown |
| Esters, Ethers |
1000 ppm |
+ |
No |
| Ketones |
1000 ppm |
+ |
No |
| Styrene |
500 ppm |
+ |
Yellow |
