User Guide

20
• ALWAYS OFF if pH > setpoint;
Using a similar format, the second relay may be set up ac-
cording to the diagram below.
ALARM RELAY
The alarm relay functions in the following manner:
During alarm condition, the relay is de-energized. When not
in alarm condition, the relay is energized.
Example: High alarm set at 10 pH
Low alarm set at 4 pH
Note If the power supply is interrupted, the relay is de-energized as
if in alarm condition to alert the operator.
High setpoint mode
alarm
ON
OFF
0
Setpoint +
Deviation
Setpoint
14
ON
OFF
Low setpoint mode
0 alarm Setpoint
14
Setpoint–
Deviation
FS•O = NC (Normally Closed)
De-energized Relay
COM
FS•C = NO (Normally Open)
Energized Relay