Service manual

26 Infant Flow

SiPAP

675-120 Revision D May 2005

Front Panel Module

The function of the front panel module is to house the gas and electrical connections

to the patient, Operator controls and indicators. The module consists of a front panel

plate, the touch screen with key pad, flowmeters and FiO

control, patient connectors

and indicators and an ambient light sensor. The backlight on the touch screen is

decreased if the ambient light sensor detects a low ambient light level and increased

if it detects a high ambient light level.

The green Power light is always on when AC power is connected to the unit.

The Alarm Warning Bar

flashes red to indicate an alarm.

Patient Trigger Module (Plus and Comprehensive Models)

The patient trigger module consists of a PCB which plugs into the main processor

PCB. Its function is to detect patient breaths and apnea and give this information to the

main processor in the electronics module. The main processor uses the signals from the

patient trigger module to instruct the biphasic pressure control to provide a timed sigh

to the patient.

Firmware Module

The firmware module is the unit’s embedded software. Its function is to instruct the

microprocessor how to control the unit and to interact with the Operator.

Touch Screen

The touch screen provides the Operator with a series of screens with icons to enable

settings, calibration and fault diagnosis. The Start Up Screen is shown in Figure 4.

The display includes a status bar which incorporates a battery status, mode

indicator, alarm button and patient trigger indicator. The center part of the display

shows icons which relate to the function being selected or performed. The display also

includes a key pad with six keys. The icon in each key changes depending on the

function being performed.

Battery Status and Charging Indicator

If the battery status shows three bars or less, the display flashes alternately between

red bars on a white background and a pink background.

Alarm Button

The alarm button alerts the Operator to fault conditions. An audible alarm is activated

at the same time. In the unalarmed condition the button is green

. In the

high-priority alarm condition, the button flashes

red and an audible

alarm is heard. If the alarm button is pressed (to silence the audible alarm), the

button changes to

and flashes red. In a medium-priority alarm condition,

the button flashes

yellow and an audible alarm is heard. In a low-priority