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PART THREE - OPERATION
SECTION 5 - CONFIGURE MENU
Rev. 7-1201
Model P63 pH Analyzer
53
PID TIMER
☞
The controller can be selected to use a velocity algorithm
(VEL) or an Instrument Society of America algorithm (ISA).
Each algorithm has anti-windup functionality. The velocity
algorithm takes into account process deadtime (transit
time), whereas the ISA algorithm does not (except by pur-
posely de-tuning the controller).
When using the “Man Reset” setting, enter the controller
output (0.0-100.0%) you want provided when the measured
pH is at the controller set point value.
Use this “PID TIMER” submenu screen to independently set
two controller output timer alarms (0.0% and 100.0%). This
will provide alarm signals whenever the controller output
remains at 0.0% or 100.0% for longer than the respectively
entered times (see Section 5.7 for details).
The PID controller remains active while the analyzer is be-
ing configured or during normal measurement operation. Its
output varies as needed, always striving to keep the proc-
ess pH at the desired set point value. However, during
calibration or by displaying the “HOLD/XFER OUTPUTS”
submenu screen in the MAINTENANCE menu, you can se-
lect the controller output to:
•
HOLD its present value.
•
Transfer (XFER) to a preset value.
•
Remain ACTIVE to respond to the measured value.
Configuration Tip!
Before tuning the controller to the
process dynamics, control the process manually (Section
6.3). This enables you to check the control element for
proper sizing and to familiarize yourself with the capabil-
ity of the control system.
After initially tuning the controller, readjustment (based on
experimentation and observed response) is usually required
until attaining desired control.
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