Vạch chỉ thị: 10 ~ 400 ppm
Thang đo:
+ 10 ~ 400 ppm, bơm 2 lần
+ 400 ~ 1200 ppm, bơm 1 lần
Thời gian lấy mẫu: 2 phút mỗi lần bơm
Chuyển đổi màu: Yellow → Pale blue
Phương trình phản ứng: (C2H5)2O+ Cr6+ + H2SO4 → Cr3+
Hệ số biến đổi: 10% (10 ~ 100 ppm), 5% (100 ~ 400 ppm)
Số ống trong hộp: 10
Dùng thích hợp với bơm: GV-100S/110S
Catalog
Manual
Performance
| Measuring Range |
| 10 to 400 ppm |
400 to 1200 ppm |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
2 minutes per pump stroke |
| Detecting Limit |
2 ppm (n=2) |
| Colour Change |
Yellow → Pale blue |
| Reaction Principle |
(C2H5)2O+ Cr6+ + H2SO4 → Cr3+ |
| Coefficient of Variation |
10% (for 10 to 100 ppm), 5% (for 100 to 400 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 |
|
+ |
Pale blue |
| Esters |
|
+ |
Pale blue |
| Ketones |
|
+ |
Pale blue |
| Calibration gas generation |
Diffusion tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 400 ppm(2014) |
500 ppm(2014) |
1.9 to 36% |
