Gastec 122 气体检测管 C6H5CH3(5-690 ppm)

Indicator: 20 to 300 ppm
Measuring Range: 
+ 5 to10 ppm, Number of Pump Strokes 2
+ 10 to 300 ppm, Number of Pump Strokes 1
+ 300 to 690 ppm, Number of Pump Strokes 1/2
Sampling Time:  per pump stroke
Colour Change: White → Brown
Reaction Principle: C6H5CH3 + I2O5 + H2SO4 → I2
Coefficient of Variation: 10% (for 10 to 100 ppm), 5% (for 100 to 300 ppm)
Nr. of tests: 10
Pump: GV-100S/110S

Detail

Catalog

Manual

Manual tube

Performance
Measuring Range
5 to10 ppm 10 to 300 ppm 300 to 690 ppm
Number of Pump Strokes
2 1 1/2
Correction Factor
1/2 1 2.3
Sampling Time
1.5 minutes per pump stroke 1 minute
Detecting Limit 1 ppm (n=2)
Colour Change White → Brown
Reaction Principle C6H5CH3 + I2O5 + H2SO4 → I2
Coefficient of Variation 10% (for 10 to 100 ppm), 5% (for 100 to 300 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 Concentration Interference Change colour by itself to
Carbon Monoxide 1000 ppm No(Two layers) Pale brown
Acetylene 2000 ppm No(Two layers) Pale brown
Xylene 1/5 time + Brown
Hexane 2000 ppm No(Two layers) Pale brown
Benzene 1/5 time + Pale yellow
Other substance measurable with this detector tube
Substance Correction Factor No. of pump strokes Measuring Range
Ethyl benzene 1.1 1 11 to 330 ppm
Calibration gas generation Diffusion tube method
TLV-TWA TLV-STEL Explosive range
20 ppm(2014) - 1.4 to 6.7%
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