Vạch chỉ thị: 40 ~ 1000 ppm
Thang đo:
+ 20 ~ 40 ppm, bơm 2 lần
+ 40 ~ 1000 ppm, bơm 1 lần
Thời gian lấy mẫu: 2 phút mỗi lần bơm
Chuyển đổi màu: hồng sang xanh da trời nhạt
Phương trình phản ứng: CH3OH + Cr6+ + H2SO4 → Cr3+
Hệ số biến đổi: 10% (40 ~ 200 ppm), 5% (200 ~ 1000 ppm)
Số ống trong hộp: 10
Dùng thích hợp với bơm: GV-100S/110S
Catalog
Manual
Manual tube
Performance
| Measuring Range |
| 20 to 40 ppm |
40 to 1000 ppm |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
2 minutes per pump stroke |
| Detecting Limit |
15 ppm (n=2) |
| Colour Change |
Pink → Pale blue |
| Reaction Principle |
CH3OH + Cr6+ + H2SO4 → Cr3+ |
| Coefficient of Variation |
10% (for 40 to 200 ppm), 5% (for 200 to 1000 ppm) |
| Shelf Life |
3 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 |
| Acetone |
 1000 ppm |
+ |
No discolouration up to 1000 ppm |
| Ethyl Acetate |
 500ppm |
No |
No discolouration up to 500 ppm |
| Toluene |
300ppm |
No |
No discolouration up to 300 ppm |
| Benzene |
70ppm |
No |
No discolouration |
Other substance measurable with this detector tube
| Substance |
Correction Factor |
No. of pump strokes |
Measuring Range |
| Ethylene Chlorohydrine |
by scale |
3 |
80 to 200 ppm |
| Calibration gas generation |
Diffusion tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 200 ppm (2014) |
250 ppm (2014) |
6 to 36% |
