Vạch chỉ thị: 10 ~ 500 ppm
Thang đo: 10 ~ 500 ppm, bơm 2 lần
Thời gian lấy mẫu: 2 phút mỗi lần bơm
Chuyển đổi màu: Yellow → Blackish brown → Pale blue sau ít phút
Phương trình phản ứng: CH3CO2CH(CH3)2+ Cr6+ + H2SO4 → Cr3+
Hệ số biến đổi: 15% (20 ~ 100 ppm), 10% (100 ~ 500 ppm)
Số ống trong hộp: 10
Dùng thích hợp với bơm: GV-100S/110S
Catalog
Manual
Performance
| Measuring Range |
10 to 500 ppm |
| Number of Pump Strokes |
2 |
| Correction Factor |
1 |
| Sampling Time |
2 minutes per pump stroke |
| Detecting Limit |
5 ppm (n=2) |
| Colour Change |
Yellow → Blackish brown → Pale blue after few minutes |
| Reaction Principle |
CH3CO2CH(CH3)2+ Cr6+ + H2SO4 → Cr3+ |
| Coefficient of Variation |
15% (for 20 to 100 ppm), 10% (for 100 to 500 ppm) |
| Shelf Life |
2 Years |
| Corrections for temperature & humidity |
Temperature 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 |
| Alcohols |
|
+ |
Blackish brown then turns to pale blue |
| Ketones |
|
+ |
Blackish brown then turns to pale blue |
| Esters |
|
+ |
Blackish brown then turns to pale blue |
| Calibration gas generation |
Diffusion tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 100 ppm |
200 ppm |
1.8 to 8% |
