Gastec 12D 氰化氢被动发现管HCN(1~200 ppm)

Indicator: 10 ~ 200 ppm
Measuring Range: 1 ~ 200 ppm
Sampling Hours: 1~10 hours
Colour Change: Yellow → Pink
Coefficient of Variation: 10% (for 10 to 40 ppm-hr),5% (for 40 to 200 ppm-hr)
Nr. of tests: 10

Detail

Catalog

Performance
Measuring Range 1 to 200 ppm
Sampling Hours 1 to 10 hours
Detecting Limit 0.3 ppm (10 hours)
Colour Change Yellow → Pink
Reaction Principle Hydrogen Cyanide reacts with the reagent to form intermediate material which stains indicator pink .
Coefficient of Variation 10% (for 10 to 40 ppm-hr),5% (for 40 to 200 ppm-hr)
Shelf Life 2 Years
Corrections for temperature & humidity Unnecessary
Store the tubes at cool and dark place.
Possible coexisting substances and their interferences (NOTE)
Substance Concentration Interference Change colour by itself to
Basic gases   No discolouration
Acid gases   + Pink
Nitrogen Dioxide 0.5ppm + Pink
Hydrogen Sulphide   + Pink
Calibration gas generation Permeation tube method
TLV-TWA TLV-STEL Explosive range
- C 4.7 ppm (2014) 5.6 to 40%
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