Furness controls FCO770, Руководство пользователя

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FCO770 Users Guide Issue 1 Page 53
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PRESSURE UNITS
•
Choose the engineering units for the pressure display. See the specification table on
page 96 for available units.
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 : not intended for use with this test type. Regulator 1 will be used.
o
FILL : not intended for use with this test type. Regulator 2 will be used.
PEAK VALUE
•
The ramp test has the option to use either the peak pressure value that was reached
before the test ends, or the final pressure value.
•
Options:
o
No : the measured pressure at the end of the test is used for the comparison
against fail limits.
o
Yes : the peak pressure is latched and used for the comparison against fail
limits. This is more useful for test items that cause the pressure to fall when
they actuate.
SENSITIVITY
•
At the start of the test the pressure ramp rate is measured. A change or ramp rate or an
external signal triggers the end of the test. A sensitivity of 100% will latch any
deviation from the initial ramp. A sensitivity of 1% will require the ramp to almost
flatten before latching occurs.
•
Set the sensitivity to zero to disable the slope check and only use the external signal
(typically a switch contact). The state of the external signal is checked at the start of
the test, and the test ends when the signal changes state.
FAIL HIGH
•
Set the maximum pressure level. If the latched pressure is above this level then a +fail
is indicated.
FAIL LOW
•
Set the minimum pressure level. If the latched pressure is below this level then a -fail
is indicated.
HOLD OFF
•
Sets the time delay after the test has started to allow valves to actuate and the pressure
ramp to start. This time is normally very short, typically 0.1 second.