Gastec 4HM Hydrogen Sulphide Detector Tube

 4HM Tube is a gas detector which performs measurements using a gas sampling pump to detect Hydrogen Sulphide parts per million (ppm)

Feature :

  • On-site measurements can be performed easily by anybody, anytime and anywhere, in a short time
  • Easy-to-check direct reading is 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

Performance :

Measuring range

25 to 50 ppm

50 to 800 ppm

800 to 1600 ppm

Number of pump strokes

2200 ml

1100 ml

1/250 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

Reference: 
https://inaparts.com/

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