Gastec 4LL 快速硫化氢测量探测管H2S(0.25-120ppm)

Indicator: 5 to 60 ppm
Measuring Range: 
+ 0.25 to 2.5 ppm, Number of Pump Strokes 2 to 10
+ 2.5 to 60 ppm, Number of Pump Strokes 1
+ 60 to 120 ppm, Number of Pump Strokes 1/2
Sampling Time:  per pump stroke
Colour Change: White → Brown
Reaction Principle: H2S + Pb(CH3COO)2 → PbS + 2CH3COOH
Coefficient of Variation: 5% (for 2.5 to 60 ppm)
Nr. of tests: 10
Pump: GV-100S/110S

Detail

Catalog

Manual

Manual tube

Measuring Range
0.25 to 2.5 ppm 2.5 to 60 ppm 60 to 120 ppm
Number of Pump Strokes
10 to 2 1 1/2
Correction Factor
1/10 to 1/2 1 2
Sampling Time 1 minute per pump stroke
Detecting Limit 0.1 ppm (n=10)
Colour Change White → Brown
Reaction Principle H2S + Pb(CH3COO)2 → PbS + 2CH3COOH
Coefficient of Variation 5% (for 2.5 to 60 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
Nitrogen dioxide 1/4 time No
Sulphur dioxide 1/1 + No
Mercaptans,
Hydroren cyanide
  No No
Ozone   Bleaching No
Calibration gas generation Permeation tube method
TLV-TWA TLV-STEL Explosive range
1 ppm (2014) 5 ppm (2014) 4.0 to 44%

 

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