Gastec 4LK 快速硫化氢测量探测管H2S

Indicator: 2 to 20 ppm
Measuring Range: 
+ 1 to 2 ppm, Number of Pump Strokes 2
+ 2 to 20 ppm, Number of Pump Strokes 1
+ 20 to 40 ppm, Number of Pump Strokes 1/2
Sampling Time:  1  minute per pump stroke
Colour Change: White → Brown
Reaction Principle: H2S + Pb(CH3COO)2 → PbS + 2CH3COOH
Coefficient of Variation: 10% (for 2 to 6 ppm), 5% (for 6 to 20 ppm)
Nr. of tests: 10

Detail

Catalog

Manual

Manual tube

Performance
Measuring Range
1 to 2 ppm 2 to 20 ppm 20 to 40 ppm
Number of Pump Strokes
2 1 1/2
Correction Factor
1/2 1 2
Sampling Time 1 minute per pump stroke
Detecting Limit 0.25 ppm (n=2)
Colour Change White → Brown
Reaction Principle H2S + Pb(CH3COO)2 → PbS + 2CH3COOH
Coefficient of Variation 10% (for 2 to 6 ppm), 5% (for 6 to 20 ppm)
Shelf Life 3 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
Mercaptans   No No
sulphur dioxide 1/2 + No
Nitrogen dioxide 1/4 No
Ozone 10 ppm Bleaching No
Calibration gas generation Permeation tube method
TLV-TWA TLV-STEL Explosive range
1 ppm 5 ppm 4.0 to 44%

 

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