简单介绍： 汽油检测管101l cnhm gasoline，measuring range 30 to 1000 ppm 1000 to 2000 ppm number of pump strokes 2 1 correction factor 1 2 sampling time 2 minutes per pump stroke ......
汽油检测管101l cnhm gasoline 产品详情
详情介绍：
汽油检测管101l cnhm gasoline
gasoline 01lcnhm
performance
measuring range
30 to 1000 ppm
1000 to 2000ppm
number of pump strokes
2
1
correction factor
1
2
sampling time
2 minutes per pumpstroke
detecting limit
5 ppm (n=2)
color change
brownish yellow →dark green
reaction principle
cnhm + cr6++ h2so4 → cr3+
coefficient ofvariation 10% (for 30 to 300ppm), 5% (for 300 to 1000 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
hydrogen sulfide - plus error
dark brown
acetylene
- plus error
dark brown
aromatic hcs - pluserror darkgreen
esters,ethers,alcohols - pluserror darkgreen
sulfur dioxide - pluserror darkgreen
organic solvents(c3) - pluserror darkgreen
othersubstance measurable with this detector tube
substance
correction
no. of pumpstrokes
measuringrange
allylchloride
factor: 34
1/2
0.1 to 3.4%
heptane
factor: 1.0
1 or 2
30 to 2000 ppm
isobutene
factor: 22
1
0.07 to2.2%
calibration gasgeneration diffusion tubemethod
tlv-twa tlv-stel explosive range
300ppm 500ppm 1.4 to 7.6%