Indicator: 20 to 2000 ppm
Measuring Range:
+ 8 to 20 ppm, Number of Pump Strokes 2
+ 20 to 2000 ppm, Number of Pump Strokes 1
+ 2000 to 6400 ppm, Number of Pump Strokes 1/2
Sampling Time: 1 minute per pump stroke
Colour Change: Yellow → Red
Reaction Principle: 3HCHO + (NH2OH)3H3PO4 → H3PO4, H3PO4 + Base → Phosphate
Coefficient of Variation: 10% (for 20 to 500 ppm), 5% (for 500 to 2000 ppm)
Nr. of tests: 10
Pump: GV-100S/110S
Catalog
Manual
Performance
| Measuring Range |
| 8 to 20 ppm |
20 to 2000 ppm |
2000 to 6400 ppm |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
1 minute per pump stroke |
| Detecting Limit |
4 ppm (n=2) |
| Colour Change |
Yellow → Red |
| Reaction Principle |
3HCHO + (NH2OH)3H3PO4 → H3PO4
H3PO4 + Base → Phosphate |
| Coefficient of Variation |
10% (for 20 to 500 ppm), 5% (for 500 to 2000 ppm) |
| Shelf Life |
2 Years |
| Corrections for temperature & humidity |
Temperature correction is necessary |
| Store the tubes in the refrigerator to keep at 10ºC (50ºF) or below. |
Possible coexisting substances and their interferences
(NOTE)
| Substance |
Concentration |
Interference |
Change colour by itself to |
| Acrolein |
5 times |
+ |
Red ( 20 ppm) |
| Acetaldehyde |
1/6 time |
+ |
Red ( 3 ppm) |
| Calibration gas generation |
Diffusion tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| - |
C 0.3 ppm(2014) |
7.0 to 73% |
