Vạch chỉ thị: 20 ~ 200 ppm
Thang đo:
+ 20 ~ 200 ppm, bơm 2 lần
+ 200 ~ 460 ppm, bơm 1 lần
Thời gian lấy mẫu: 2 phút mỗi lần bơm
Chuyển đổi màu: hồng sang xanh nhạt
Phương trình phản ứng: CH3CH(OH)CH3 + Cr6++ H2SO4 → Cr3+
Hệ số biến đổi: 10% (20 ~ 60 ppm), 5% (60 ~ 200 ppm)
Số ống trong hộp: 10
Dùng thích hợp với bơm: GV-100S/110S
Catalog
Manual
Performance
| Measuring Range |
| 20 to 200 ppm |
200 to 460 ppm |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
2 minutes per pump stroke |
| Detecting Limit |
7 ppm (n=2) |
| Colour Change |
Pink → Pale blue |
| Reaction Principle |
CH3CH(OH)CH3 + Cr6++ H2SO4 → Cr3+ |
| Coefficient of Variation |
10% (for 20 to 60 ppm), 5% (for 60 to 200 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,Ketones |
|
No |
No |
| Aliphatic hydrocarbon |
|
No |
No |
| Aromatic hydrocarbon |
|
No |
No |
Other substance measurable with this detector tube
| Substance |
Correction Factor |
No. of pump strokes |
Measuring Range |
| Propyl alcohol |
by scale |
2 |
55 to 170 ppm |
| Ethylene glycol MBE |
by scale |
2 |
60 to 400 ppm |
| Ethylene glycol MEE |
2.3 |
2 |
46 to 460 ppm |
| Ethylene glycol MME |
2.2 |
2 |
44 to 440 ppm |
| 1-Methoxy-2-propanol |
1.3 |
2 |
26 to 260 ppm |
| Calibration gas generation |
Diffusion tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 200 ppm (2014) |
400 ppm (2014) |
2 to 12.7% |
