Indicator: 0.2 to 10 ppm
Measuring Range:
+ 0.09 to 0.2 ppm, Number of Pump Strokes 5
+ 0.2 to 10 ppm, Number of Pump Strokes 3
+ 10 to 72 ppm, Number of Pump Strokes 1
Sampling Time: 1 minute per pump stroke
Colour Change: Yellow → Brown
Coefficient of Variation: 10% (0.2 to 2 ppm), 5% (2 to 10 ppm)
Nr. of tests: 10
Pump: GV-100S/110S
Catalog
Manual
Performance
| Measuring Range |
| 0.09 to 0.2 ppm |
0.2 to 10 ppm |
10 to 72 ppm |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
1 minute per pump stroke |
| Detecting Limit |
0.05 ppm (n=5) |
| Colour Change |
Yellow → Brown |
| Reaction Principle |
Hydrogen fluoride reacts with indicator to produce reddish brown stain. |
| Coefficient of Variation |
10% (for 0.2 to 2 ppm), 5% (for 2 to 10 ppm) |
| Shelf Life |
2 Years |
| Corrections for temperature & humidity |
Humidity 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 |
| Nitric acid |
≧ 1/5 |
+ |
Reddish purple |
| Hydrogen chloride |
≧ 1/2 |
+ |
Reddish purple |
| Nitrogen dioxide |
|
No |
No |
| Calibration gas generation |
Permeation tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 0.5ppm |
C2 ppm |
- |
