氨气气体检测管3la ammonia nh3 产品详情
详情介绍：
氨气气体检测管3la ammonia nh3 ammonia no.3lanh3
performance
measuring range
2.5to 5ppm
5 to 100 ppm
100 to 200ppm
number of pumpstrokes
2
1
1/2
correction factor
1/2
1
2
sampling time
30 seconds per pumpstroke
detecting limit
0.5ppm (n=2)
color change
purple →yellow
reaction principle
3nh3 + h3po4 → (nh4)3po4
coefficient ofvariation 10% (for5 to 20 ppm), 5% (for 20 to 100 ppm)
shelflife 3years
correctionsfor
temperature & humidity temperature correction is necessary
store the tubes at cool and darkplace.
possible coexisting substances and theirinterferences (note)
substance
concentration
interference
change color by itself
carbondioxide
1%
minuserror(20%)
-
hydrazine
- plus error
produce yellowdiscoloration
amines
1/15
plus error
discolors at 5ppm(yellow)
calibration gasgeneration diffusion tubemethod
tlv-twa tlv-stel explosive range
25ppm 35ppm 15 to 28%