Gas treatment devices and systems

摘要

An HME or filter has a gas-sampling port 20 on its casing 1 opening on one side of the HME element 10, 11 in the casing. The port 20 has a valve seat 27 and a spring-operated valve element 25, which normally closes the port but which is opened by insertion of a coupling 42 on the end of tubing 41 connected to a gas monitor 40, so that gas can flow to the monitor.