Gastec 122L Quick-measuring Detector tubes Toluene (1~100ppm)
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Indicator: 2 to 50 ppm
Measuring Range:
+ 1 to 2 ppm, Number of Pump Strokes 4
+ 2 to 50 ppm, Number of Pump Strokes 2
+ 1 to 2 ppm, Number of Pump Strokes 1
Sampling Time: 1.5 minute per pump stroke
Colour Change: White → Brown
Reaction Principle: C6H5CH3 + I2O5 + H2SO4 → I2
Coefficient of Variation: 10% (for 2 to 10 ppm), 5% (for 10 to 50 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 | 1.5 minutes per pump stroke | |||
| Detecting Limit | 0.5 ppm (n=4) | |||
| Colour Change | White → Brown | |||
| Reaction Principle | C6H5CH3 + I2O5 + H2SO4 → I2 | |||
| Coefficient of Variation | 10% (for 2 to 10 ppm), 5% (for 10 to 50 ppm) | |||
| Shelf Life | 3 Years | |||
| Corrections for temperature & humidity | Unnecessary | |||
| Store the tubes at cool and dark place. | ||||
Possible coexisting substances and their interferences (NOTE)
| Substance | Interference | Change colour by itself to |
| Acetylene, Ethylene, Hexane | No | No |
| Alcohols, Ketones, Esters | No | No |
| Aromatic hydrocarbons | + | Brown |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| Xylene | 4,2,1 | 1,2,4 | 2 to 200 ppm |
Calibration Scale
| Ethyl Benzene Conc. (ppm) Tube 122L Reading (n = 2) |
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Calibration Scale
| Cumene Concentration (ppm) Tube 122L Reading (n= 2) |
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Calibration Scale
| Diethyl Benzene Conc. (ppm) Tube 122L Reading (n=4) |
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| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 20 ppm(2014) | - | 1.4 to 6.7% |
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