Gastec 4HM Hydrogen Sulphide Detector Tube

4HM Tube is a gas detector which performing measurements using a gas sampling pump

Feature

  • On-site measurements can be performed easily by anybody, anytime and anywhere, in a short time
  • Easy-to-check direct reading possible due to the calibrated scale directly printed on the tube
  • An extensive measuring range can be obtained by adjusting the sampling volume
  • In order to assure high precision, each production lot is tested and calibrated independently, Each detector tube has its own quality control number printed on the tube
  • Long shelf-life with excellent long-term stability

Gastec Tube Detector Fitur

Performance

Measuring range 25 to 50 ppm 50 to 800 ppm 800 to 1600 ppm
Number of pump strokes 2(200 ml) 1(100 ml) 1/2(50 ml)
Correction factor 1/2 1 2
Sampling time 1.5 min 45 sec 30 sec

Detecting limit : 5 ppm (2 pump strokes)
Colour change : White → Brown
Corrections for temperature & humidity: Unnecessary
Relative standard deviation: 5 %(for 50 to 800 ppm)
Shelf life : 3 years

Reaction principle

H2S + Pb(CH3COO)2 → PbS + 2CH3COOH

Possible coexisting substances and their interferences

Substance Concentration Interference Changes colour by itself to
Nitrogen dioxide
Sulphur dioxide
Ammonia
Carbon dioxide
Carbon monoxide
Mercaptans
Organic gases & vapours
 ≧ 1/4
≧ 1/1
 -

No
No
No
No
No
No
No
No
No
No
No
No

Calibration gas generation

Permeation tube method

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