检测认证人脉交流通讯录
- 甲醛检测管91 Formaldehyde HCHO，Measuring Range 2 to 20ppm 20 to 50ppm 50 to 100ppm Number of Pump Strokes 2 1 1/2 Correction Factor 1 2.5 5 Sampling Time 1 minute per，甲醛检测管价格
甲醛检测管91 Formaldehyde HCHO的详细介绍
甲醛检测管91 Formaldehyde HCHO
Formaldehyde No.91 HCHO
Performance
Measuring Range
2 to 20ppm
20 to 50ppm
50 to 100ppm
Number of Pump Strokes
2
1
1/2
Correction Factor
1
2.5
5
Sampling Time
1 minute per pump stroke
Detecting Limit
0.5 ppm (n=2)
Color Change
White → Brown
Reaction Principle
HCHO + C6H4(CH3)2 + H2S2O7 → Condensation Polymer
Coefficient of Variation 15% (for 2 to 6 ppm), 10% (for 6 to 20 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
Aldehydes
1/2 time
Plus error
Produce brown stain
Esters, Ethers
1000 ppm
Plus error
No discoloration
Ketones
1000 ppm
Plus error
No discoloration
Styrene
500 ppm Plus error Yellow at 500 ppm
Other substance measurable with this detector tube
Calibration gas generation Diffusion tube method
TLV-TWA TLV-STEL Explosive range
- C 0.3ppm 7.0 to 73%
