Gastec CH3CHO 92L 乙醛CH3CHO气体检测管 (1~20ppm)

Indicator: 1~20ppm
Measuring Range: 1~20ppm
Sampling Time: 2 minutes per pump stroke
Colour Change: Yellow → Brown 
Reaction Principle: 3CH3CHO + (NH2OH)3H3PO4 → H3PO4, H3PO4 + Base → Phosphate
Coefficient of Variation: 10% (for 1 to 6 ppm), 5% (for 6 to 20 ppm)
Nr. of tests: 10
Pump: GV-100S/110S

Detail

Catalog

Manual tube

Manual

Performance
Measuring Range
1 to 20 ppm
Number of Pump Strokes
1
Correction Factor
1
Sampling Time 2 minutes per pump stroke
Detecting Limit 0.2 ppm (n=1)
Colour Change Yellow → Brown
Reaction Principle 3CH3CHO + (NH2OH)3H3PO4 → H3PO4
H3PO4 + Base → Phosphate
Coefficient of Variation 10% (for 1 to 6 ppm), 5% (for 6 to 20 ppm)
Shelf Life 2 Years
Corrections for temperature & humidity Temperature correction is necessary
 
Possible coexisting substances and their interferences (NOTE)
Substance Concentration Interference Change colour by itself to
Ammonia 30 ppm No No
Acetic acid 2 times + Brown
Acids   + Brown
Aldehydes   + Brown
Ketones   + Brown
 
 
Calibration gas generation Diffusion tube method
TLV-TWA TLV-STEL Explosive range
- C 25 ppm  4 to 60%

 

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