Gastec Tubes and Sampling Pump
Short terms quick measuring detector tubes 
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Gas sampling pump kit and accessories
 
 
 
Acetaldehyde  

NO.92M

CH3CHO
Performance  
Measuring Range
2.5 to 5 ppm 5 to 100 ppm
Number of Pump Strokes
2 1
Correction Factor
1/2 1
Sampling Time 1.5 minutes per pump stroke
Detecting Limit 0.25 ppm (n=2)
Colour Change Yellow → Red
Reaction Principle 3CH3CHO + (NH2OH)3H3PO4 → H3PO4
H3PO4 + Base → Phosphate
Coefficient of Variation 10% (for 5 to 20 ppm), 5% (for 20 to 100 ppm)
Shelf Life 2 Years
Corrections for temperature & humidity Unnecessary
Store the tubes in the refrigerator to keep at 10ºC (50ºF) or below.
 
Possible coexisting substances and their interferences (NOTE)
Substance Concentration Interference Change colour by itself to
Ammonia   No
Acrolein 3/5 times + Red
Acetone 2 times + Red
Methyl ethyl ketone 6 times + Red
MIBK 10 times + Red
Calibration gas generation Diffusion tube method
TLV-TWA TLV-STEL Explosive range
- C 25 ppm 4 to 60%
 
 
 
   
 

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