2-8 Uson 628 Operator’s Manual
2.4.1 Component Operation
Filter: A coalescing filter is fitted to protect the internal pneumatic components by
reducing the oil content to 0.01 PPM and removing 0.01 μm particles from the
inlet air supply.
Regulator: A pressure regulator is used to set the required test pressure.
Fill/Vent Valve: The Fill/Vent Valve connects the test component, via the
Equalization Valve, in the open state, to either atmosphere, via the vent port, or to
the regulator to charge the test component to the test pressure, or isolates the
pressure within the test component.
Equalization Valve: The Equalization Valve, in the closed state, isolates the Test
and Reference ports and holds the pressure within the test component during the
Measure step. In the open state, the test component is connected to the Fill/Vent
Val v e.
Differential Pressure Transducer: The Differential Pressure Transducer
measures the pressure difference between the test and reference ports during the
Measure step and is used to indicate the leakage of the component connected to the
test port.
Couple Valve: The couple valve is used to provide the pneumatic signal for a
coupling device, which, when selected, is activated for the duration of the test
cycle.
Pressure Gauge: The Pressure Gauge Transducer measures the test pressure
within the component and is used to check that the test pressure is within the pre-
set tolerance.
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