简单介绍： 硫化氢气体检知管4m h2s，measuring range 12.5 to 25 ppm 25 to 250 ppm 250 to 500 ppm number of pump strokes 2 1 1/2 correction factor 1/2 1 2 sampling time 30 seconds硫化氢气体......
硫化氢气体检知管4m h2s 产品详情
详情介绍：
硫化氢气体检知管4m h2s
hydrogen sulphide no.4mh2sperformance
measuring range
12.5 to 25 ppm
25 to 250 ppm
250 to 500 ppm
number of pump strokes
2
1
1/2
correction factor
1/2
1
2
sampling time
30 seconds per pump stroke
detecting limit
2.5 ppm (n=2)
color change
white → brown
reaction principle
h2s + pb(ch3coo)2 → pbs + 2ch3cooh
coefficient of variation 5% (for 25 to 250 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 color by itself
nitrogen dioxide
1/4 timer
minus error
no discoloration
sulfur dioxide
1 time
plus error
no discoloration
mercaptans
- no effect
no discoloration
other substance measurable with this detector tube
calibration gas generation permeation tube method
tlv-twa tlv-stel explosive range
10ppm 15ppm 4.0 to 44%