104 AWT420 | UNIVERSAL 4-WIRE, DUAL-INPUT TRANSMITTER | OI/AWT420-EN REV. B
Appendix D PID control
channels (control of other signals [turbidity, dissolved oxygen
etc.] is not required).
Control functionality is available for both channels of the
AWT420 transmitter.
Conductivity channels are configurable for reverse or direct-
acting control. pH channels are configurable for reverse-acting,
direct-acting or dual (Acid/Base) control:
• a reverse-acting controller generates a single control
output
• a direct-acting controller generates a single control output
• a dual-acting controller generates 2 control outputs
Control outputs are configurable for Analog, Time
Proportioning or Pulse Frequency output. Analog control
outputs can be assigned to any of the available analog outputs.
Time proportioning control outputs can be assigned to any
of the available relays or digital outputs and pulse frequency
control outputs can be assigned to any of the available relays
or digital outputs.
Operator pages
Reverse or direct-acting control
A Instrument tag
B Sensor-specific tag
C Primary value and units
D Adjustable parameter icon (using / keys).
E Setpoint
F Control output percentage
G page 35
H page 83
I page 35
J Time and date
Figure 35 Operator page – reverse or direct-acting control
Dual-acting (Acid and Base) control
A Instrument tag
B Sensor-specific tag
C Primary Value & units
D SPA: Acid control setpoint.
E SPB: Base control setpoint
F Control output percentage
G page 35
H page 83
I page 35
J Adjustable parameter icon (using / keys).
K Time and date
Figure 36 Operator page – dual-acting (Acid and Base) control
AL
04-09-2019
08:52:03
/
PV
PV unit
SP
O/P
%
3.50
7.00
65.0
S1: Recovery
Device Tag
Sensor Tag
A
04-09-2019
08:52:03
/
PV PV unit
SPA
SPA
O/P
%
13.50
–50.0
6.008.00
S1: Recovery
Device Tag
Sensor Tag
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