6. Functional description
6.1 General
The ambient air is drawn into the unit via the coarse dust filter located in the rear of
the unit. There, the air is used on the one hand to cool the compressor and to
generate the oxygen product gas.
The air compressed by the compressor is protected by a unit inlet filter before being
alternately supplied to the two molecular sieves of the functional unit. Molecular sieve
A is supplied via inlet valve E1 and molecular sieve B is supplied via inlet valve E 2.
The two outlet valves A 1 and A 2 vent the molecular sieves A and B. The previously
bound nitrogen is blown off to the environment via an exhaust silencer. The
respective inactive molecular sieve is purged with product gas from the active
molecular sieve and precharged with oxygen-enriched air at the end of a cycle.
All valves are controlled directly, microprocessor-controlled by the control board.
The temperature sensor is led into the compressor room on stranded wires and
responds at a temperature of >60°C.
The pressure in the oxygen tank is detected by a pressure sensor and evaluated by
the microprocessor.
The product gas is passed through the multifunction sensor, which simultaneously
determines the volume flow and oxygen content of the product gas by means of
ultrasonic transit time measurement.
If the O2 concentration in the product gas drops below 82%, the oxygen status alarm
is triggered.
If the O2 concentration in the oxygen tank drops below 60%, the oxygen deficiency
alarm is triggered.
An adjustable pressure regulator reduces the outlet pressure to approx. 475 mbar.
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