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RR635 - Effect of tubing type on gas detector sampling systems


This investigation was designed to determine the effect of polytetrafluoroethylene (PTFE), fluorinated ethylene propylene (FEP) and Tygon tubing on the response times of the detection systems utilised to monitor Hydrogen Sulphide (H2S), Nitrogen Dioxide (NO2), Nitric Oxide (NO) and Toluene (C7H8).

Main Findings


PTFE and FEP can be used with minimal effect when sampling H2S, NO and NO2. Tygon may be used when sampling H2S, NO and NO2 if PTFE and FEP are not available providing the delay time is not an issue, but the tube dimensions must be as small as practically possible without restricting the flow rate of the sampling instrument. Tygon is not suitable for use in sampling C7H8 but PTFE and FEP may be used providing the delay time is not an issue.

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Updated 2019-09-03