Carbon Monoxide (CO) Detection Tubes (6 to 1000 ppm)
Gastec Detection Tube No. 1La measures Sulfur Dioxide with a Range of 8 to 1000 ppm.
- Measuring Range:
- 8 to 12.5 ppm
- 12.5 to 25 ppm
- 25 to 500 ppm
- 500 to 1000 ppm
- Number of Pump Strokes: 3, 2, 1, 1/2
- Correction Factor: 3, 2, 1, 1/2
- Sampling Time: 2 minutes per pump stroke
- Detecting Limit: 2ppm (3 pump strokes)
- Changes from Yellow to Blackish Brown
- Corrections for temperature & humidity: Temperature correction is necessary
- 3 Year Shelf Life
- Reaction Principle: CO + Na2Pd(SO3)2 → Pd + CO2 + SO2 + Na2SO3
- Relative Standard Deviation: 10 % (for 25 to 100 ppm), 5 % (for 100 to 500 ppm)
- Store the tubes at cool and dark place.
Possible coexisting substances and their interferences:
| Substance |
Concentration |
Interference |
Changes color by itself to |
| Hydrogen |
≧ 5000 ppm |
+ |
Blackish brown (whole layer) (≧ 1%) |
| Acetylene |
≧ 1/50 |
+ |
Blackish brown |
| Carbon disulfide |
≧ 1/50 |
+ |
Blackish brown |
| Halogens |
≧ 1/5 |
+ |
Blackish brown |
| Hydrogen sulfide |
≧ 1/5 |
+ |
Blackish brown |
| Mercaptans |
≧ 1/5 |
+ |
Blackish brown |
| Sulfur dioxide |
≧ 1/10 |
+ |
Blackish brown |
| Ethylene |
≦ 2000 ppm |
No |
Few minutes later, whole layer turns to brown |
| Nitrogen dioxide |
≧ 40 ppm |
+ (Bleaching) |
Red (≧ 60 ppm) |
Carbon Monoxide (CO) Detection Tubes (6 to 1000 ppm)
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