简单介绍： 汽油检测管101 cnhm gasoline measuring range 0.015 to 0.03% 0.03 to 0.6% 0.6 to 1.2% number of pump strokes 2 1 1/2 correction factor汽油检测管价格
汽油检测管101 cnhm gasoline 产品详情
详情介绍：
汽油检测管101 cnhm gasoline gasoline 01 cnhmperformance
measuring range
0.015 to 0.03%
0.03 to 0.6%
0.6 to 1.2%
number of pump strokes
2
1
1/2
correction factor
1/2
1
2
sampling time
1 minute per pump stroke
detecting limit
0.003% (n = 2)
color change
orange → dark green
reaction principle
cnhm + cr6++ h2so4 → cr3+
coefficient of variation 10% (for 0.03 to 0.1 %), 5% (for 0.1 to 0.6 %)
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 color by itself
acetylene
3%
yes produce dark brown to whole layer
propane
0.2%
yes produce dark brown to whole layer
(2%)
aromatic hcs
500 ppm
plus error
produce dark green
(5000ppm)
alcohols, esters, ethers
- plus error
produce dark green
halogenated hcs.
5000 ppm
plus error
produce dark green
(5000ppm)
hydrogen sulfide
500 ppm
plus error
produce dark green
(5000ppm)
sulfur dioxide
500 ppm
plus error
produce green
(5000ppm)
other substance measurable with this detector tube
substance
correction
no. of pump strokes
measuring range
heptane
factor: 1.0
1/2, 1 or 2
0.015 to 1.2%
isooctane
factor: 0.9
1
0.027 to 0.54%
octane
factor: 1.2
1
0.036 to 0.72%
calibration gas generation static gas dilution method
tlv-twa tlv-stel explosive range
300ppm 500ppm 1.4 to 7.6%