Functional Description - Weinmann OXYMAT 3 Servicing And Repair Instructions

2. Functional description

OXYMAT 3 is a time-controlled appliance, i.e. the changeover time remains constant; only the pressure is
monitored.
Layout
The appliance essentially consists of three compo-
nents:
• the compressor,
• the O system,
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• the electronic/pneumatic control.
During operation, the compressor draws in ambi-
ent air via a coarse dust filter and a suction filter,
and passes the compressed air (approx. 1.7 bar
overpressure) into containers with molecular sieves
where the actual oxygen enrichment takes place.
The functional principle of molecular sieves is
based on their property of absorbing the nitrogen
contained in the air. The oxygen contained in the
air is then collected in the oxygen tank (further de-
tails can be found in the chapter " The O
ment process" on page 6).
The outlet pressure is regulated by a pressure-
reducer set to 0.6 bar.
The required quantity (flow) of oxygen is set on the
oxygen dosage control knob
meter is used, the flow is controlled via the flow
control knob . The flow is read at the top edge
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of the flowmeter ball .
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Every time it is switched on, the appliance control
system performs an internal self-test of the entire O
system. This test takes about a minute. If the test de-
tects an error in the O system that results in a drop
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in the oxygen concentration, it activates the yellow
status indicator .
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After the self-test, OXYMAT 3 switches to normal
operation. During normal operation the sequence
control constantly monitors the electrical and pneu-
matic circuits of the oxygen system.
In order to allow the process to run continuously, the containers operate alternately, i.e. before one container
is saturated with nitrogen, the system switches to the second container, which then continues with oxygen
enrichment. During this period, the first container is regenerated by a brief reduction in pressure, and at the
same time is flushed by a partial flow of enriched oxygen. This procedure is implemented cyclically at 7-
second intervals, thereby ensuring continuous oxygen enrichment of the inspiratory air.
enrich-
2
. Where a flow-
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2
Dosage monitor
Pressure-reducer
Oxygen tank
Container with
molecular sieve
Noise suppressor
Cooler
Compressor
Suction filter
Coarse dust
filter
Functional description
Ambient air
5