Gastec 91 便携式气体检测管甲醛检测管HCHO(2~100ppm)

Indicator: 2 to 20 ppm
Measuring Range: 
+ 2 to 20 ppm, Number of Pump Strokes 2
+ 20 to 50 ppm, Number of Pump Strokes 1
+ 50 to 100 ppm, Number of Pump Strokes 1/2
Sampling Time: 45 seconds per pump stroke
Colour 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)
Nr. of tests: 10
Pump: GV-100S/110S

Detail

Catalog

Manual

Performance
Measuring Range
2 to 20 ppm 20 to 50 ppm 50 to 100 ppm
Number of Pump Strokes
2 1 1/2
Correction Factor
1 2.5 5
Sampling Time 45 seconds per pump stroke
Detecting Limit 0.5 ppm (n=2)
Colour 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 colour by itself to
Aldehydes 1/2 time + Brown
Esters, Ethers 1000 ppm + No
Ketones 1000 ppm + No
Styrene 500 ppm + Yellow

 

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