
Transmitter Multiparameter M400 59
© 11 / 08 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter Multiparameter M400
Printed in Switzerland 52 121 378
Pulse Frequency – If using a pulse input metering pump, select ”Relays” and ”PF”, Pulse
Frequency. Choose the first relay position as #3 and / or the second relay position as #4
according to the table below. Set the pulse frequency to the maximum frequency allowed for the
particular pump being used, typically 60 to 100 pulses / minute. Control action will produce this
frequency at 100% output.
C
NOTE: All relays from #1 to #6 can be used for the controlling function.
CAUTION: Setting the Pulse Frequency too high may cause the pump to overheat.
1
st
Relay Position = #3 2
nd
Relay Position = #4 Pulse Frequency (PF)
Conductivity
Controlling
concentrating
chemical feed
Controlling dilution water
Max allowed for the
pump used (typically
60–100
pH / ORP
Feeding base Feeding acid
Max allowed for the
pump used (typically
60–100
Dissolved
Oxygen
Reverse control action
Direct acting control
action
Max allowed for the
pump used (typically
60–100
Analog – If using Analog control, change ”Relays” to ”Analogout” using up / down arrow keys.
Choose the first Analogout position as #1 and / or the second Analogout position as #2
according to the table below. Select the analog output current range required by the control
device, 4–20 or 0–20 mA. Press [ENTER].
1
st
Analogout Position = #1 2
nd
Analogout Position = #2
Conductivity
Controlling concentrating
chemical feed
Controlling dilution water
pH / ORP
Feeding base Feeding acid
Dissolved Oxygen Reverse control action Direct acting control action
10.4 Tune Parameters
(PATH: MENU / PID Setup / Tune Parameters)
This menu assigns control to a measurement and sets the setpoint, tuning parameters and non-
linear functions of the controller through a series of screens.
10.4.1 PID Assignment & Tuning
Assign the measurement, a, b, c, or d to be controlled after ”PID on_”. Set the Gain (unitless),
Integral or Reset time Tr (minutes) and Rate or Derivative time Td (minutes) needed for control.
Press [ENTER]. Gain, Reset and Rate are later adjusted by trial and error based on process
response. Always begin with Td at zero.
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