Service Manual
Integra E-Z Oxygen Concentrators
Chart SeQual Technologies Inc. Page 4 of 34 P/N 2917
The ATF module utilizes twelve sieve beds and a patented rotary valve to produce a constant flow of
oxygen. A small electric motor and reduction gear mounted on the ATF module turns the valve. As the
valve rotates, compressed air is channeled to the beds, resulting in four of the beds producing oxygen,
four beds are static, and four beds are purging. The oxygen is collected in the product head and is then
routed through the pod assembly for patient use. Purge gasses are expelled through two integral
mufflers in the ATF base, characterized by a soft, rhythmic “breathing” noise, which can be heard
when operating the unit with the covers removed.
CAUTION:
There are no field serviceable components in the ATF assembly.
Any attempt to open the module, without the express written
consent of SeQual Technologies, will result in module
contamination and will void the warranty.
The ATF product flow/pressure is self-regulating by matching compressor size (pressure and volume
of flow) to the rated flow of a particular ATF module. Fixed orifices within the module regulate
oxygen used as sieve bed purge gas. No adjustments of any type are required in the field. Full
concentration is usually achieved within three (3) to ten (10) minutes of turning the unit on, therefore a
10-minute warm up period is recommended prior to conducting concentration tests for diagnostic
purposes..
Gas balance is maintained by controlling the flow rate on the POD assembly to operate the unit within
its design range. If the product flow is set beyond this design range, there will be insufficient oxygen
available to completely purge the beds and concentration will drop. Conversely, if there is extremely
low flow (less than 0.5 LPM) more oxygen is purging and a build-up of inert argon gas will occur,
which will reduce overall concentration readings.
As with any mechanical device, certain precautions must be observed in order to maintain the unit
properly. By familiarizing themselves with several basic principles of ATF operation, technicians will
be able to rapidly diagnose problems, effect repairs and return the concentrator to service.
Always apply voltage to the gear motor assembly prior to introducing airflow to the ATF. Check that
the shaft visible on the top of the gearbox is rotating. Some grease run-out in this area is typical,
especially in units that have had long, continuous service. Wipe the area and mark the drive shaft with
a marker to assist in detecting rotation. Minor gear mesh noise is acceptable, but any inconsistent,
jerky, or intermittent motion is not normal. Rotation should be smooth.
Always cap or plug the ATF oxygen outlet and air inlet ports when it is not installed or when the hoses
are removed. Even short duration exposure to moisture-laden air can have an adverse effect on ATF
performance.
Never operate an ATF beyond its rated flow capacity. Ensure that the Integra flow selector knob or an
external flow meter properly limits the product flow rate. An ATF designed to deliver 5 liters per
minute (LPM) of flow will rapidly suffer performance loss if operated at 6 LPM. Within a short period
of time, this performance loss can become permanent.
Never apply compressed air flow to an ATF with a damaged, missing, or malfunctioning gear motor
assembly. Even a few minutes of flow without valve rotation can severely and permanently damage the
module.
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