Specifications

Transmitter M300 FLOW 50

Printed in Switzerland 52 121 319

10 PID Setup

(PATH: Menu/PID Setup)

PID Setup

Tune

Parameters

ModePID A/M PID Display

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

regulation of a process. Before conﬁguring the transmitter, the following process characteristics

must be identiﬁed.

Identify the control direction of the process:

Throttling with signal-to-close type valve – direct acting where increasing measurement pro-

duces increasing control output

Pump or throttling with signal-to-open valve – reverse acting where increasing measurement

produces decreasing control output

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 devices such as an 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 ﬂow. 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.

Controller with Corner Points

–120%

–100%

–80%

–60%

–40%

–20%

20%

40%

60%

80%

100%

120%

0 100 200 300 400 500 600 700

Flowrate (LPM)

Deadband - value

Proportional limit –100% value

Proportional limit +100% value

Output4

Direct corner point (value, %)

Set point value

Deadband + value

Reverse corner point (value, %)