Service manual

Service Manual 23
675-120 Revision D May 2005
Figure 1 - IFSD Front Panel
Gas Module
The function of the gas module is to take air and oxygen, blend them into the
required mixture and deliver this mixture to the patient at the prescribed flow rate.
The gas module also measures the oxygen concentration, measures the patient
pressure, provides an auxiliary gas outlet (optional) and provides switched Biphasic flow.
The main components are an air/oxygen blender, a flow manifold, a vent valve, an
exhaust manifold with alarm whistle, NCPAP Pres low and NCPAP Pres high flowmeters,
and a valve/sensor PCB. The inlet gas connections are on an interchangeable inlet block
to allow for different gas fittings. The exhaust manifold discharges gas to the outside of
the case and is positioned away from the electrical connectors and switch to reduce any
potential explosive hazard.