Gastec 4HM Gas Detector Hydrogen Sulphide Tube is a gas detector which performing measurements using a gas sampling pump.
Gastec 4HM Gas Detector 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
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)
- Color change: White → Brown
- Corrections for temperature & humidity: Unnecessary
- Relative standard deviation: 5 %(for 50 to 800 ppm)
- Shelf life : 3 years
Gastec 4HM Gas Detector Reaction principle
- H2S ＋ Pb(CH3COO)2 → PbS ＋ 2CH3COOH
Possible coexisting substances and their interferences
| Substance | Concentration | Interference | Changes colour by itself to |
| Nitrogen dioxide | ≧ 1/4 | － | 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 |
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