Mettler Toledo M400/2(X)H Specifikace Strana 72

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Transmitter M400/2(X)H, M400G/2XH 72
© 03 / 2014 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter M400/2(X)H, M400G/2XH
Printed in Switzerland 30 031 683
10.3.1 PID mode
This menu assigns a OC or analog output for PID control action as well as details of their opera-
tion. Based on the control device being used, select one of the following three paragraphs for
use with solenoid valve, pulse input metering pump or analog control.
Pulse Length – If using a solenoid valve, select ”OC” and ”PL”, pulse length.
Choose the first OC position as #1 (recommended) and / or the second OC position as #2 (rec-
ommended) as well as the pulse length (PL) according to the table below. A longer pulse length
will reduce wear on the solenoid valve. The % ”on” time in the cycle is proportional to the con-
trol output.
h
NOTE: All OCs #1, #2 can be used for the controlling function.
1
st
OC 2
nd
OC
Pulse OC
Conductivity
Controlling
concentrating reagent
feed
Controlling dilution water
Short (PL) provides
more uniform feed.
Suggested start point
= 30 sec.
pH / ORP Feeding base Feeding acid
Reagent addition cycle:
short PL provides more
uniform addition of
reagent. Suggested start
point = 10 sec.
Dissolved
Oxygen
Reverse control action
Direct acting control
action
Feed cycle time: short
PL provides more
uniform feed. Suggested
start point = 30 sec.
Pulse Frequency – If using a pulse input metering pump, select ”OC” and ”PF”, pulse frequency.
Choose the first OC position as #1 and / or the second OC position as #2 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.
h
NOTE: All OCs #1, #2 can be used for the controlling function.
CAUTION: Setting the pulse frequency too high may cause the pump to overheat.
1
st
OC 2
nd
OC Pulse Frequency (PF)
Conductivity
Controlling
concentrating
chemical feed
Controlling dilution water
Max allowed for the
pump used (typically
60–100
pulses / minute)
pH / ORP Feeding base Feeding acid
Max allowed for the
pump used (typically
60–100
pulses / minute)
Dissolved
Oxygen
Reverse control action
Direct acting control
action
Max allowed for the
pump used (typically
60–100
pulses / minute)
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