DH Instruments PPC2+, Руководство пользователя

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PPC2+™ Operation and Maintenance Manual
Page 33
©2001 DH Instruments, Inc.
3.2.4 UPPER LIMIT
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PURPOSE
To set the upper limit pressure value for a pressure range and measurement mode.
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PRINCIPLE
The UPPER LIMIT function allows the setting of a maximum pressure not to be exceeded
when using a specific range and measurement mode. Automated pressure control target
values above the upper limit will not be accepted and direct pressure control keys will shut
off when the upper limit is reached.
Upper limit settings are specific to each range and measurement mode ( gauge
or absolute ).
The UPPER LIMIT function is most often used to protect the device or system connected
to the PPC2+ TEST port from accidental overpressure.
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OPERATION
When the [UPPER LIMIT] function key is pressed from the main run screen the display is:
1. Entry field to enter desired upper limit value.
Enter the desired upper limit value and PPC2+ returns to the main run screen with a new
upper limit value active.
When the UPPER LIMIT has been exceeded, the display of current pressure flashes and
a buzzer sounds for 3 seconds every 2 seconds. Reduce pressure using direct pressure
control keys or an automated pressure command to return to normal operation.
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