Service Manual
Integra E-Z Oxygen Concentrators
Chart SeQual Technologies Inc. Page 6 of 34 P/N 2917
control and monitoring functions. Circuit traces route power to the cooling fan, ATF gear
motor, and compressor.
WARNING
Line voltage is present at the circuit board at all times when
the unit is plugged into a wall outlet. Unplug the concentrator
prior to performing maintenance or repairs in this area.
CAUTION:
Do not touch or attempt removal of the circuit board without
ensuring that all Electro-Static Discharge (ESD) procedures
and controls are in place. Damage to components on the printed
circuit board can result in a failure in performance of the device.
The push button On/Off switch is of the momentary contact, which is read by microcontroller
on the main board and turns on the power to activate cooling fan, ATF gear motor and
compressor.. . A Pure Sine wave electrical signal for Mains power is required to operate the
Integra only. Subsequently, a Modified Sine Wave for Mains power is not recommended.
A power management feature has been incorporated to improve protection to the user in the
event of a momentary power failure. In the event of a power interruption, the unit will alarm as
normal for a power loss. A 9V battery provides back-up power for alarm circuit. The unit will
resume operating twenty seconds after the initial interruption, unless it has been turned off
during the power interruption.
Integra E-Z family of oxygen concentrators incorporates a closed-loop feedback flow control
valve, eliminating the need for the user to adjust or tweak the flow on the unit more than the
initial setting. This is accomplished by the integration of a flow and concentration
measurement system (OM models only) in a new control system. From the patient point of
view, the system will operate in a “set and forget” mode where a desired flow rate is set (using
up/down arrows and a display to indicate the target flow rate) and the system automatically
adjusts the internal flow control valve to provide that flow to the patient, regardless of what
accessories are attached to the oxygen concentrator.
The OM models also incorporate circuitry on the printed circuit board which are used in
conjunction with the ultrasonic measurement flow tube and uses the timing of the speed of
sound in the gas mixture to calculate the percentage of oxygen present in the gas stream. A
timing circuit on the board prevents the low oxygen alarm from sounding during the warm-up
cycle (a maximum of 10 minutes).
The Integra E-Z oxygen concentrator does not utilize a conventional circuit breaker. A separate
“current-sense” transformer mounted on the printed circuit board continuously monitors the
current being drawn by the compressor. This sensing feature will turn off the concentrator to
prevent excessive current draw in the event of a component failure or other abnormal high
demand condition. There is nothing to reset. Once the unit detects the abnormal power
condition it will shut-down and alarm. The user will only need to turn off the unit and turn it
back on and assuming the power has returned to normal and there is no additional fault it will
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