EUTECH INSTRUMENTS ALPHA COND 500 - REV 4 Spezifikationen PDF herunterladen (Seite 43)

Transmitter Cond/Res 2-Channel M300 43

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10 PID Setup

(PATH: Menu/PID Setup)

PID control is proportional, integral and derivative control action that can provide smooth regu-

lation of a process. Before conﬁguring the transmitter, the following process characteristics must

be identiﬁed.

Identify the control direction of the process:

Dilution – direct acting where increasing measurement produces increasing control output such

as controlling the feed of low conductivity diluting water to cooling towers or boilers

Concentrating – reverse acting where increasing measurement produces decreasing control out-

put, such as controlling chemical feed to attain a desired concentration

Identify the control output type based on the control device to be used:

Pulse Frequency – used with pulse input metering pump

Pulse Length – used with solenoid valve

Analog – used with current input device such as electric drive unit, analog input metering pump

or current-to-pneumatic (I/P) converter for pneumatic control valve

Default control settings provide linear control which is appropriate for conductivity. The non-

linear control settings are used in pH/ORP models of this transmitter. Therefore ignore settings

of deadband and corner points in the Tuning Parameter section below.

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EUTECH INSTRUMENTS ALPHA COND 500 - REV 4 Spezifikationen Seite 43