Indicator: 20 to 250 ppm
Measuring Range:
+ 5 to 10 ppm, Number of Pump Strokes 2
+ 10 to 250 ppm, Number of Pump Strokes 1
+ 250 to 625 ppm, Number of Pump Strokes 1/2
Sampling Time: 45 seconds per pump stroke
Colour Change: White → Pale green
Reaction Principle: NO + Cr6+ + H2SO4 →NO2, NO2 + (C6H5)2NH → Pale green product
Coefficient of Variation: 10% (for 10 to 40 ppm), 5% (for 40 to 250 ppm)
Nr. of tests: 10
Pump: GV-100S/110S
Details
Catalog
Manual
Manual tube
Performance
Measuring Range |
5 to 10 ppm |
10 to 250 ppm |
250 to 625 ppm |
|
Number of Pump Strokes |
|
Correction Factor |
|
Sampling Time |
45 seconds per pump stroke |
Detecting Limit |
2 ppm (n=2) |
Colour Change |
White → Pale green |
Reaction Principle |
NO + Cr6+ + H2SO4 →NO2 NO2 + (C6H5)2NH → Pale green product |
Coefficient of Variation |
10% (for 10 to 40 ppm), 5% (for 40 to 250 ppm) |
Shelf Life |
2 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 |
Hydrogen chloride |
50 ppm |
Unclear demarcation |
Bluish purple (10 ppm) |
Ozone |
80 ppm |
Unclear demarcation (two layers) |
Pale brown |
sulphur dioxide, Hydrogen sulphide |
1/1 |
+ |
No |
Methanol |
400 ppm |
 |
No |
Calibration gas generation |
Permeation tube method |
TLV-TWA |
TLV-STEL |
Explosive range |
NO2: 0.2 ppm(2014) NO: 25 ppm(2014) |
- |
- |