Single and dual input analyzers for pH/Redox (ORP)
AX416, AX436, AX460, AX466 & AX468 5 Programming
IM/AX4PH Rev. P 37
Note. The following examples illustrate High Alarm Actions, i.e. the alarm is activated when the process variable exceeds the
defined set point. Low Alarm Actions are the same, except the alarm is activated when the process variable drops below the
defined set point.
Fig. 5.2 High Failsafe Alarm without Hysteresis and Delay
Fig. 5.3 High Failsafe Alarm with Hysteresis but no Delay
Fig. 5.4 High Failsafe Alarm with Hysteresis and Delay
Relay Energized,
LED Off
Relay De-energized, LED On
Process Variable
High Set Point
Relay Energized,
LED Off
Relay De-energized, LED On
Process Variable
Hysteresis
High Set Point
Relay Energized,
LED Off
Relay De-energized, LED On
Process Variable
High Set Point
Delay
Hysteresis
Fig. 5.5 High Non-Failsafe Alarm without Delay and Hysteresis
Fig. 5.6 High Failsafe Alarm with Delay but no Hysteresis
Relay De-energized,
LED Off
Relay Energized, LED On
Process Variable
High Set Point
Relay Energized,
LED Off
Relay De-energized, LED On
Process Variable
High Set Point
Delay
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