Mettler Toledo M300 ISM Especificaciones Pagina 73

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Transmitter M300 73
© 12 / 11 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter Multiparameter M300
Printed in Switzerland 52 121 389
10 PIDSetup
(PATH: Menu/PID Setup)
PID Setup
Tune
Parameters
ModePID A/M
PID Display
Setup
PID control is proportional, integral and derivative control action that can provide smooth regula-
tion of a process. Before configuring the transmitter, the following process characteristics must
be identified.
Identify the controldirectionof the process
Conductivity:
Dilution – direct acting where increasing measurement produces increasing control output
such as controlling the feed of low conductivity diluting water to rinse tanks, cooling towers
or boilers
Concentrating – reverse acting where increasing measurement produces decreasing control
output, such as controlling chemical feed to attain a desired concentration
– DissolvedOxygen:
Deaeration – direct acting where increasing DO concentration produces increasing control
output such as controlling the feed of a reducing agent to remove oxygen from boiler feed-
water
Aeration – reverse acting where increasing DO concentration produces decreasing control
output, such as controlling an aerator blower speed to maintain a desired DO concentration
in fermentation or wastewater treatment
– pH/ORP:
Acid feed only – direct acting where increasing pH produces increasing control output, also
for ORP reducing reagent feed
Base feed only – reverse acting where increasing pH produces decreasing control output,
also for ORP oxidizing reagent feed
Both acid and base feed – direct and reverse acting
– Ozone:
Ozone destruct – direct acting where increasing ozone concentration produces increasing
control output such as increasing UV lamp intensity
Ozonation – reverse acting where increasing ozone concentration produces a decreasing
control output to decrease the output of an ozonator.
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
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