ARJAY ENGINEERING 2880R-LT, User Manual, Page: 19 / 28

2880R-LT, 2881R-LT, 2882R-LT Revision 1.0 P a g e 19 | 28
3. RELAY DELAY (Delay). Minimum time in seconds for an alarm to exist before the
corresponding relay changes to its alarm state. The relay alarm state depends on the Relay
Action and Failsafe settings. Factory default is 0.
4. RELAY ACTION (Dir). High ˄sp or Low ˅sp Action. For high action, the alarm is set when the
% level rises above the high alarm set point and is reset when the % level drops below the low
alarm set point. For low action, the alarm is set when the % level drops below the low alarm
set point and is reset when % level rises above the high alarm set point. Factory default is
HIGH action.
5. FAILSAFE (Fsafe). Failsafe typically means that the relay is normally (when not in an alarm
condition) held in an energized state. In an alarm condition, the relay is de-energized i.e.
identical to when the instrument power is shut off. The rationale is that the alarm condition
should match the Power Fail condition. Factory default is Yes.
The following table shows the effect of the Relay Action and Failsafe settings.
Relay
Action Failsafe
Setting
Effect
High No
Alarm condition when process level rises above the High Setpoint
for at least the alarm delay period.
Alarm condition remains active until the process level drops below
the Low Setpoint.
No action is taken when the process level is between the High and
Low Setpoints.
In the alarm condition, the corresponding alarm LED is turned ON,
and the relay is energized.
High Yes
Alarm condition set and reset as above.
In the alarm condition, the corresponding alarm LED is turned ON,
and the relay is de-energized.
Low No
Alarm condition when process level drops below the Low Setpoint
for at least the alarm delay period.
Alarm condition remains active until the process level rises above
the High Setpoint.
No action is taken when the process level is between the High and
Low Setpoints.
In the alarm condition, the corresponding alarm LED is turned ON,
and the relay is energized.
Low Yes
Alarm condition set and reset as above.
In the alarm condition, the corresponding alarm LED is turned ON,
and the relay is de-energized.