Furness controls FCO770, Руководство пользователя, Страница: 43 / 101

FCO770 Users Guide Issue 1 Page 43
o COARSE LEAK: This is similar to the blockage test, but measures pressure
decay relative to the fill pressure. The test item is pressurised, and then isolated
from the pressure source. The level of leak is determined by checking the test
pressure decay after a pre-set time. Pressure decay is shown as a positive leak.
Positive and negative fail limits may be checked. The fill pressure is checked
against the pressure tolerance to ensure a valid starting pressure.
o
INPUT/OUTPUT: This activates the step outputs and test-programmable outputs
and checks the feedback inputs. The test time is used as an adjustable delay after
which the external fail input is checked. This test may, for example, be used to
actuate electrical or pneumatic features of a test component and check correct
actuation via sensors. There is no measured value with for this test. The test result
is determined by the feedback timeout and external fail status.
The rest of the test data settings depend upon the type of test selected and are detailed
for each test type…
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LEAK UNITS
•
Choose the engineering units for the leak display. The FCO770 can display the leak in
either pressure units, pressure rate units or flow units. See the specification table on
page 96 for available units.
PRESSURE UNITS
•
Choose the engineering units for the pressure display. See the specification table on
page 96 for available units.
AUTO PREFILL
•
Only displayed if prefill is enabled in the Global Settings menu.
•
The auto prefill function is useful where the test item is slow to fill or has a restriction
in the fill path. It may also be used as a cost-effective way of testing at different
pressures without manual adjustment or an auto-regulator.
•
Options:
o
NO : auto prefill is not used.
o
INT : auto prefill uses the standard internal fill valve to fill the test item.
o
EXT : auto prefill uses an external valve to fill the test item. The valve should
be operated by the prefill stage output.
REGULATOR 2
•
Selects the second internal regulator (if fitted), or an external regulator. Electrical or
pneumatic outputs may be programmed to select an external regulator.
•
Options:
o
NO : regulator 1 is used for the test.
o
YES : regulator 2 is used for the test
o
PREFILL : regulator 2 is used for prefill, regulator 1 is used for fill.
o
FILL : regulator 1 is used for prefill, regulator 2 is used for fill.