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
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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