Pneumatic purging assembly

摘要

A respiratory measurement system comprises a pneumatic subassembly for purging with a continuous stream of low pressure and low volume air lumen tubing (23) connecting (47) an air flow rate sensor to an analyzer module (41,42,43), the lumen tubing including at least a first lumen tube and a second lumen tube. Said pneumatic subassembly comprises an air pump (83) and an air reservoir (84) for producing a volume of relatively high pressure air, and first and second pneumatic resisters (85,86) pneumatically connected to the air pump and air reservoir and to the first and second lumen tube, so that a small volume of air migrates from the volume of relatively high pressure air through the resisters and into the lumen tubing.