Gastec 159 Quick-measuring Detector tubes Tetrahydrofuran (C4H8O 159 (20~800ppm))
Model159
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Indicator: 50 to 800 ppm
Measuring Range:
+ 20 to 50 ppm, Number of Pump Strokes 2
+ 50 to 800 ppm, Number of Pump Strokes 1
Sampling Time: 3 minute per pump stroke
Colour Change: Pink → Pale Blue
Reaction Principle: C4H8O + Cr6+ + H2SO4 → Cr3+
Coefficient of Variation: 15% (for 50 to 200 ppm), 10% (for 200 to 800 ppm)
Nr. of tests: 10
Pump: GV-100S/110S
Performance
| Measuring Range |
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| Number of Pump Strokes |
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| Correction Factor |
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| Sampling Time | 3 minutes per pump stroke | ||
| Detecting Limit | 2 ppm (n=2) | ||
| Colour Change | Pink → Pale Blue | ||
| Reaction Principle | C4H8O + Cr6+ + H2SO4 → Cr3+ | ||
| Coefficient of Variation | 15% (for 50 to 200 ppm), 10% (for 200 to 800 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 |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| 1.4-Dioxane | by scale | 2 | 25 to 140 ppm |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 50 ppm | 100 ppm | 2 to 11.8% |
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