Measuring Range
20 to 50 ppm 50 to 800 ppm
Number of Pump Strokes
2 1
Correction Factor
0.4 1
Sampling Time 5 minutes per pump stroke
Detecting Limit 2 ppm (n=2)
Colour Change Pink → Pale Blue
Reaction Principle C4H8O + Cr6+ + H2SO4 → Cr3+
Coefficient of Variation 15% (for 50 to 200 ppm), 10% (for 200 to 800 ppm)
Shelf Life 3 Years
Corrections for temperature & humidity Temperature correction is necessary
Store the tubes at cool and dark place.
Possible coexisting substances and their interferences (NOTE)
Substance Concentration Interference Change colour by itself to
Alcohols   + Pale blue
Other substance measurable with this detector tube
Substance Correction Factor No. of pump strokes Measuring Range
1.4-Dioxane by scale 2 25 to 140 ppm
Calibration gas generation Diffusion tube method
TLV-TWA TLV-STEL Explosive range
50 ppm 100 ppm 2 to 11.8%

Return to previous viewGo to top of page