Gastec Tubes and Sampling Pump
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Gas sampling pump kit and accessories
 
 
 
Acetaldehyde  

NO.92

CH3CHO
Performance  
Measuring Range
5 to10 ppm 10 to 300 ppm 300 to 750 ppm
Number of Pump Strokes
4 2 1
Correction Factor
0.5 1 2.5
Sampling Time 2 minutes per pump stroke
Detecting Limit 2 ppm (n=4)
Colour Change Yellow → Red
Reaction Principle 3CH3CHO + (NH2OH)3H3PO4 → H3PO4
H3PO4 + Base → Phosphate
Coefficient of Variation 10% (for 10 to 100 ppm), 5% (for 100 to 300 ppm)
Shelf Life 2 Years
Corrections for temperature & humidity Temperature correction is necessary
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
 
Other substance measurable with this detector tube
Substance Correction Factor No. of pump strokes Measuring Range
Diacetyl by scale 3 25 to 1500 ppm
Calibration gas generation Diffusion tube method
TLV-TWA TLV-STEL Explosive range
- C 25 ppm 4 to 60%
 
 
 
   
 

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