DH Instruments PPC2+, Manual

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PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 22
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Figure 6. Dynamic Pressure Control Operation
3.1.2.4 PRESSURE READY (<*>)/NOT READY (<
↑
> OR <
↓
>)
The far left character of the main run screen provides a pressure Ready (<*>)/Not
Ready (<
↑
> or <
↓
>) indication. This indication is intended to provide the user with a
clear and objective criterion for determining when a valid pressure measurement can
be made.
Ready (<*>)/Not Ready (<
↑
> or <
↓
>) indications are:
•
<*>: Pressure Ready.
•
<
↓
>: Pressure Not Ready and decreasing.
•
<
↑
>: Pressure Not Ready and increasing.
When pressure control is NOT active: A Ready (<*>) condition will occur any time
NO control valve is operating and the pressure rate of change is inside the
stability limit. The stability limit is defined in terms of rate of change of pressure in
current pressure units per second.
When pressure control is active: The criteria for determining the Ready (<*>)/Not
Ready (<
↑
> or <
↓
>) condition depend on whether the current control mode is static
or dynamic. Pressure Ready (<*>)/Not Ready (<
↑
> or <
↓
>) parameters are set by
default when a control mode is selected and or can be customized if desired (see
Sections 3.2.3 and 3.2.6).