简单介绍： 苯气体检测管121sl c6h6 benzene，measuring range 1 to 20 ppm 20 to 100 ppm number of pump strokes 5 1 correction factor 1 5 sampling time 2 minutes per pump stroke detec......
苯气体检测管121sl c6h6 benzene 产品详情
详情介绍：
苯气体检测管121sl c6h6 benzene
benzene21slc6h6performance
measuringrange
1 to 20 ppm
20 to 100 ppm
number of pumpstrokes
5
1
correctionfactor
1
5
sampling time
2 minutes per pumpstroke
detecting limit
0.25 ppm (n=5)
color change
white → brownishgray
reaction principle
c6h6 + i2o5 + h2s2o7 → i2
coefficient ofvariation 20% (for1 to 5 ppm), 15% (for 5 to 20 ppm)
shelflife 3years
correctionsfor
temperature & humidity unnecessary
store the tubes at cool and darkplace.
possible coexisting substances and theirinterferences (note)
substance
concentration
interference
change color by itself
hexane
50 ppm
no effect
no discoloration
toluene
100 ppm
no effect
no discoloration
xylene
150 ppm
no effect
no discoloration
aromatichydrocarbons other than benzene are trapped in the brown layer inthe pretreatment tube.if the pretreatment reagent is entirelyconsumed (whole brown layer turns to dark brown),ahigher reading will be given.
calibration gasgeneration diffusion tubemethod
tlv-twa tlv-stel explosive range
0.5ppm 2.5ppm 1.3 to 7.1%