3. OPERATION
Page 21 © 1998 DH Instruments, Inc.
3.1.2.4 PRESSURE READY/NOT READY INDICATION
The far left character of the display provides a pressure "Ready/Not Ready" 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 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.
The determination of the "ready/not ready" condition is different for static and
dynamic pressure control. Pressure Ready/Not Ready parameters are set by
default when a control mode is selected and can be customized (see Sections
3.2.3 and 3.2.6).
3.1.2.4.1 Static Control Ready/Not Ready
When static pressure control mode is active a "ready" condition will occur when:
1. No control valve is operating.
2. The current measured pressure is inside the hold limit.
3. The rate of change of pressure is less than the current stability limit.
Ready/Not Ready Static Control Mode
To Next Page
Loading...