ER5000 —
50
Glossary of Terms
Stable State
Any time that a PID Controller generates a zero Error for more
than one loop of monitoring and response. Proper Tuning aims to
nd a correct balance between stability and speed of response.
Steady State Error
See Offset.
Step Change
Change in Setpoint that occurs within a single loop of monitoring
and response for a PID controller.
Supply Pressure
Pressure applied to the inlet of the ER5000 from an external
source. Sent by the ER5000 as Pilot Pressure to pilot a Dome
Loaded or Air Actuated Regulator.
System Pressure
The pressure of the gas or liquid in a Process Line that is controlled
by the Regulator, which is controlled in turn by the Pilot Pressure
from the PID Controller. There are two components to system
pressure: the inlet pressure (upstream pressure), which is the
pressure level of the gas or liquid in the process line at the point
where it enters the regulator and the outlet pressure (downstream
pressure), which is the pressure level of the gas or liquid as it exits
the regulator. For a Pressure Reducing Regulator, the inlet pressure
must be higher than the outlet pressure.
Term
Used alternatively with value when referring to Proportional,
Integral and Derivative.
Transducer
Commonly used term for an external sensing device that provides
a feedback signal.
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