Gastec 122DL 甲苯被动发现管C6H5CH3(2~500 ppm)

Indicator: 20 ~ 500 ppm
Measuring Range: 2 ~ 500 ppm
Sampling Hours: 1 to 10 hours
Colour Change: White → Brown
Coefficient of Variation: 10% (20 ~ 500 ppm-hr)
Nr. of tests: 10

Detail

Catalog

Performance
Measuring Range 2 to 500 ppm
Sampling Hours 1 to 10 hours
Detecting Limit 1 ppm (10 hours)
Colour Change White → Brown
Reaction Principle Toluene react with formaldehyde to form condensation polymer, which is brown in colour.
Coefficient of Variation 10% (for 20 to 500 ppm-hr)
Shelf Life 2 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
Aromatic hydrocarbons   + Brown
Alcohols, Ketones, Esters 30ppm No No
Other substance measurable with this detector tube
Substance Correction Factor Sampling Time Measuring Range
Xylene Factor: 1.7 1 to 10 3.4 to 850 ppm
Ethyl benzene Factor: 1.4 1 to 10 2.8 to 700 ppm
Cumene Factor: 1.7 1 to 10 3.4 to 850 ppm
Benzene Factor: 1.2 1 to 10 2.4 to 600 ppm
Stylene Factor: 13 1 to 10 26 to 6500 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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