硫化氢气体检测管4hm h2s 产品详情
详情介绍：
硫化氢气体检测管4hm h2s
hydrogen sulphide no.4hmh2sperformance
measuring range
25 to 50 ppm
50 to 800 ppm
800 to 1600 ppm
number of pump strokes
2
1
1/2
correction factor
1/2
1
2
sampling time
1 minute per pump stroke
detecting limit
5 ppm (n=2)
color change
white → brown
reaction principle
h2s + pb(ch3coo)2 → pbs + 2ch3cooh
coefficient of variation 5% (for 50 to 800 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 time
minus error
no discoloration
sulfur dioxide
1 time
plus error
no discoloration
ammonia
- no effect
no discoloration
carbon dioxide
- no effect
no discoloration
carbon monoxide
- no effect
no discoloration
mercaptans
- no effect
no discoloration
organic gases & vapors
- no effect
no discoloration
other substance measurable with this detector tube
calibration gas generation high pressure gas cylinder method
tlv-twa tlv-stel explosive range
10ppm 15ppm 4.0 to 44%