Gastec 4HM 快速硫化氢测量探测管H2S(25-1600ppm)

Indicator: 50 to 800 ppm
Measuring Range: 
+ 25 to 50 ppm, Number of Pump Strokes 2
+ 50 to 800 ppm, Number of Pump Strokes 1
+ 800 to 1600 ppm, Number of Pump Strokes 1/2
Sampling Time:  45 seconds per pump stroke
Colour Change: White → Brown
Reaction Principle: H2S + Pb(CH3COO)2 → PbS + 2CH3COOH
Coefficient of Variation: 5% (for 50 to 800 ppm)
Nr. of tests: 10
Pump: GV-100S/110S

Detail

Catalog

Manual

Manual tubes

Performance
Measuring Range
25 to 50 ppm 50 to 800 ppm 800 to 1600 ppm
Number of Pump Strokes
2 1 1/2
Correction Factor
1/2 1 2
Sampling Time 45 seconds per pump stroke
Detecting Limit 5 ppm (n=2)
Colour Change White → Brown
Reaction Principle H2S + Pb(CH3COO)2 → PbS + 2CH3COOH
Coefficient of Variation 5% (for 50 to 800 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
Ammonia   No No
Carbon dioxide   No No
Carbon monoxide   No No
Mercaptans   No No
Organic gases & vapours   No 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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