Indicator: 2 to 20 ppm
Measuring Range:
+ 1 to 2 ppm, Number of Pump Strokes 2
+ 2 to 20 ppm, Number of Pump Strokes 1
+ 20 to 40 ppm, Number of Pump Strokes 1/2
Sampling Time: 1 minute per pump stroke
Colour Change: White → Brown
Reaction Principle: H2S + Pb(CH3COO)2 → PbS + 2CH3COOH
Coefficient of Variation: 10% (for 2 to 6 ppm), 5% (for 6 to 20 ppm)
Nr. of tests: 10
Detail
Catalog
Manual
Manual tube
Performance
Measuring Range |
1 to 2 ppm |
2 to 20 ppm |
20 to 40 ppm |
|
Number of Pump Strokes |
|
Correction Factor |
|
Sampling Time |
1 minute per pump stroke |
Detecting Limit |
0.25 ppm (n=2) |
Colour Change |
White → Brown |
Reaction Principle |
H2S + Pb(CH3COO)2 → PbS + 2CH3COOH |
Coefficient of Variation |
10% (for 2 to 6 ppm), 5% (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 |
Mercaptans |
|
No |
No |
sulphur dioxide |
1/2 |
+ |
No |
Nitrogen dioxide |
1/4 |
 |
No |
Ozone |
10 ppm |
Bleaching |
No |
Calibration gas generation |
Permeation tube method |
TLV-TWA |
TLV-STEL |
Explosive range |
1 ppm |
5 ppm |
4.0 to 44% |