Gastec Tubes and Sampling Pump
Short terms quick measuring detector tubes 
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Gas sampling pump kit and accessories
 
 
 
Explanation of specification items
(Example)  
Index of target gases/substances  
Styrene

NO.124L

HCHO  
Performance    
Measuring Range 2 to 25 ppm 25 to 100 ppm
Number of Pump Strokes 4 1
Correction Factor 1 4
Sampling Hours 30 seconds per pump stroke
Detecting Limit 0.5 ppm (n=4)
Colour Change White → Yellow
Reaction Principle Styrene reacts with sulphuric acid fuming to form a condensation polymer which is yellow stain.
Coefficient of Variation 10% (for 2 to 5 ppm), 5% (for 5 to 25 ppm)
Shelf Life 3 Years
Corrections for temperature & humidity Unnecessary
Store the tubes at cool and dark place.
Possible coexisting substances and their interferences
Substance Concentration Interference Change color by itself to
Alcohols, Esters 10 times + (Bleaching) No
Aldehydes, Ketones 10 times + (Bleaching) No
Butadiene 5 ppm + (Bleaching) Blackish brown
Other substance measurable with this detector tube
Substance Correction Factor Pump Strokes Measuring Range
Divinyl benzene 0.6 3 1 to 15 ppm
Calibration gas generation Diffusion tube method
TLV-TWA TLV-STEL Explosive range
20 ppm 40 ppm 1.1 to 6.1%
 
 
   
 

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