简单介绍： 甲醛气体检测管91l formaldehyde hcho，measuring range 0.1 to 5 ppm 5 to 40 ppm number of pump strokes 5 1 correction factor 1 8 sampling time 1.5 minutes per pump stroke ......
甲醛气体检测管91l formaldehyde hcho 产品详情
详情介绍：
甲醛气体检测管91l formaldehyde hcho
formaldehyde no.91lhchoperformance
measuringrange
0.1 to 5 ppm
5 to 40 ppm
number of pumpstrokes
5
1
correctionfactor
1
8
samplingtime
1.5 minutes per pumpstroke
detectinglimit
0.05 ppm (n=5)
colorchange
yellow → reddishbrown
reactionprinciple
3hcho +(nh2oh)3h3po4 → h3po4
h3po4 + base→ phosphate
coefficient ofvariation 10% (for 0.1 to 0.5ppm), 5% (for 0.5 to 5 ppm)
shelflife 3years
correctionsfor
temperature & humidity temperature correction is necessary
store the tubes inthe refrigerator to keep at 10oc (50of) orbelow.
possible coexisting substances and theirinterferences (note)
substance
concentration
interference
change color by itself
aldehydes
- plus error
produce reddish brownstain
ketones
- plus error
produce reddish brownstain
acid gases
- plus error
produce redstain
organic acids
- no effect
no stain bythemselves
othersubstance measurable with this detector tube
substance
correction factor
no. of pump strokes
measuring range
diisobutylketone
5.8
4
0.58 to 29 ppm
methaldehyde
0.65
3
0.065 to3.25ppm
propionaldehyde
7.6
1
0.76 to 38ppm
91l tube reading(n=1)
0.2
0.5
1
2
3
4
5
benzaldehyde(ppm)
2
4
9
22
40
63
92
91l tube reading(n=1/2)
0.2
0.5
1
2
3
4
5
cyclohexanone(ppm)
10
30
60
130
220
330
470
calibration gasgeneration diffusion tubemethod
tlv-twa tlv-stel explosive range
- c 0.3 ppm 7.0 to 73%