Figure 4-1. System Board Diagram - Saros 9400R-SEQ Operators & Service Manual

POWER BOARD
The Power Board takes external power that comes into the SAROS from the AC Power Adapter, 24 VDC Cable or Battery and
monitors and controls power distribution to the rest of the SAROS system. The Power Board also drives the cooling fan.
SYSTEM BOARD
The System Board is the center of nearly all the SAROS functions. The System Board is a micro controller-based system that
monitors system dynamics such as temperatures, pressures, ATF stepper motor and proportional valve, product flow and con-
centration, and the Users' input, indicators and buzzer operation and external communications. It measures temperature of the
oxygen, compressor motor, ambient temperature, and ATF temperature, BCMD, Power Board and the Battery.
The System Board utilizes a proprietary ultrasonic flow and concentration sensor and a flow control valve to accurately control
the flow oxygen in the various flow delivery modes.
CONTROL PANEL
The Control Panel provides a user interface consisting of a membrane panel keyboards, Liquid
Crystal Display (LCD), external power present indicator, Battery capacity indicator, alarm
status indicators, and a buzzer. The user interface informs the user of the system status and al-
lows the user to set the desired flow modes and flow rate – continuous or pulse, display mode
– normal or tactical, set up system parameters and acquire system information.
CONTINUOUS FLOW MODE
The user may set the SAROS oxygen flow rate and mode. Continuous Flow Mode delivers a constant flow of oxygen to the Oxy-
gen Outlet Port at settings of 1, 2, and 3 LPM. Within the SAROS, concentrated oxygen is stored in a product tank at pressures in
the range of 5 – 9 psi and is back-pressure compensated. This pressure gives Continuous Flow Mode the capability to deliver the
indicated flow rate to the patient even if extension tubing is used, up to 50 feet long. In addition, the SAROS Continuous Flow
Mode is fully compatible with humidifier use.
PULSE FLOW MODE WITH autoSAT TECHNOLOGY
The SAROS Pulse Flow Mode with autoSAT Technology delivers a high flow of oxygen at the very beginning of each
inspiratory effort. The approach is based on the manner in which gas is delivered into a patient's airway. The user may
select pulse volume delivery rates between 16 and 96 ml. Pulse durations vary between 100 milliseconds and 500 mil-
liseconds due to dead space considerations. Maximum cannula length is 7 feet.
The fundamental approach to triggering and controlling the oxygen bolus in Pulse Flow Mode is: The user may select pulse trig-
ger sensitivity in settings 1 (most sensitive), 2, or 3 (least sensitive). The pulse will be triggered when the system meets all the
following criteria: The cannula pressure has dropped below the trigger point (typically between 0.15 and 0.45 cm H2O). At least
1.25 seconds has passed since the last pulse began.
22 | 9735-SEQ H

Figure 4-1. System Board Diagram

Operator & Service Manual