Breathing Machine
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- MEASUREMENT APPLICATION
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Description
The apparatus comprises essentially 3 main parts:
- A pneumatic cylinder and a slave cylinder for CO2 dead space testing;
- A geared electric motor and mechanical drive mechanism;
- Control gear for the motor and solenoid operated valves.
By making the appropriate adjustments to the motor controller and the mechanical drive mechanism respectively, the pneumatic cylinder is capable of providing any one of five pre-set swept volumes of 1.0, 1.5, 1.75, 2.0 and 2.5 litres at variable rates up to 40 strokes per minute.
The slave cylinder provides a swept volume equivalent to 5% of that of the main cylinder.
In order to provide positive airflow control, solenoid-operated valves are provided. The solenoids are controlled by photoelectric switches.
The main lung valves should be connected in line with 25mm bore PVC tubing (6mm OD pushfit tubing for the CO2 circuit). The exact connection arrangement of the tubing and the valves, with respect to a dummy headform which carries the facemask under test, will depend upon the standard being employed.
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