Service manual

32 Infant Flow
®
SiPAP
675-120 Revision D May 2005
WARNING
The NCPAP Pres high must be adjusted to zero when not required for the
patient.
Triggered BiPhasic
For BiPhasic Tr, a micro controller provides reliable indications of breaths derived
from the patient abdominal respiratory sensor. It sends signals to operate the
NCPAP Pres high valve to provide a timed sigh.
WARNING
Under extreme conditions (minimum supply pressure and maximum gas
demand, including auxiliary output) output flow rates may reduce.
Operation Without Electrical Power
The IFSD can be used without electrical power. In this mode, NCPAP Pres low flow
only is delivered, set by the NCPAP Pres low flowmeter and the required FiO
2
level. In
this mode, visual indications and warnings are not given except for the gas failure
alarm.
Electronic Functions
Sensors mounted on the valve/sensor PCB monitor pressure, flow rate and oxygen.
Sense signals for each of the valves allow the micro-controller to monitor the valve’s
state and determine whether the valve is connected or short circuited. Current to the
valve sensor PCB is limited via the fuses below a 10 VA limit to ensure safety in a
possible oxygen enriched environment.
The patient trigger PCB interfaces with the main processor PCB via a 20 way head.
Communication between the two PCB’s is via a CAN bus. The main processor PCB
also supplies +5 V power to this PCB and monitors other control signals.