Uson sprint iq, Руководство пользователя

Страница: 59 / 122

Programming
57
4.1.1.5 Delta Pressure
The Delta Pressure is the amount of pressure change from the first
pressure measurement in test phase (
P1 ) to the last pressure
measurement in test phase ( P2 ). Decay rate is the pressure drop
divided by time.
Although Sprint iQ takes continuous pressure measurements from
the start of fill time, only two readings are used to calculate the
pressure drop-the first reading at the start of test phase and the last
reading at the end of test phase. Sprint iQ uses the pressure drop
to compare to the maximum allowable loss (known as the reject
maximum) to decide whether a product is accepted as good or
rejected as bad. The reject limit you enter into the parameters
menu is generally a low pressure value, such as 0.050 psig,
because the reject pressure is the drop from the first pressure
reading, not the full pressure on the scale.
Reject Maximum, Reject Minimum (Reject Limits)
This the setting for the pressure limits allowed in a product during
the test phase before a reject is triggered. These settings are made
in the
Reject Limit Menu under the Test Parameters Menu (see
page 38). The level is the difference between the actual test
pressure (
P1 ) and the test pressure unit values you enter. The
menu allows easily selecting how the limits will be used as Pass
Criteria to decide the outcome of the test. For example, if the “In
Band” Pass Criteria is chosen, if the pressure is equal to or within
the max and min setting at the end of test phase, the product
passes. The instant the pressure change exceeds a limit in test
phase, the test ends and the reject light turns on. If vent is set on,
the dump valve opens and vents the pressure to atmosphere
without waiting for the test phase to finish.
P 1 P 2 –
Test Time
------------------------- Decay Rate =