Transmitter Cond/Res 2-Channel M300 43
© 05/07 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter Cond/Res 2-Channel M300
Printed in Switzerland 52 121 318
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.
Comments to this Manuals