Furness controls FCO770, Руководство пользователя

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FCO770 Users Guide Issue 1 Page 57
PREFILL TOLERANCE
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Only used with auto prefill and only displayed if auto prefill is used.
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The initial pressure may be higher or lower than the desired pressure depending if it is
a vacuum or pressure test or possibly upon the result of a previous test if used in a
sequence. To ensure that the item fills towards the required pressure rather than
farther away from it, the prefill stage will end if the pressure moves from the initial
pressure in the wrong direction by more than the prefill tolerance.
TEST PRESSURE
•
Set the nominal test pressure. This is used in conjunction with the tolerance setting to
ensure that the applied test pressure is within the test specification.
PRESSURE TOLERANCE
•
Sets the pressure tolerance for fault indication. Set 100.0% to disable.
+FAIL
•
Sets the pressure level at which the instrument will indicate a positive fail. Note that
pressure decay indicates a positive leak.
-FAIL
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Sets the pressure level at which the instrument will indicate a fail in the negative leak
region. This should be set as a positive value.
PREFILL TIME
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Only used with auto prefill and only displayed if auto prefill is used.
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This is a limit that should be set to the maximum allowable time to prefill. Prefill will
end when the prefill pressure is reached or when the prefill time expires if the
pressure is not reached. Set to zero to disable the time limit.
FILL TIME
•
Sets the time that the test pressure is applied for before the fill valve is closed. This
should be sufficient to allow the component to be filled to the required pressure. If the
pressure is out of tolerance at the end of the fill time then a gross leak is indicated.
TEST TIME
•
Sets the time that the pressure is allowed to leak from the test item after the fill
pressure has been removed. The pressure decay is compared to the fail levels at the
end of this time (unless the End On Fail option is enabled).
VENT TIME
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Set the required vent time to allow the test item to vent through an external vent
valve. This should be set long enough to ensure that the test item is not unclamped
while pressurised.