Omega WI8XX-U manual Alarms 1

4.3.7.3 Alarms 1 & 2

Alarm 1 (or 2) Relay: to enable or disable (no alarm function) the alarms .

Alarm 1 (or 2) Low: editable box for the low alarm value.

Alarm 1 (or 2) High: editable box for the high alarm value.

Active: If Above, Alarm condition triggered when the process variable is greater than the Alarm Hi Value (Low value ignored).

If Below, Alarm condition triggered when the process variable is less than the Alarm Low Value (Hi value ignored).

If Hi/Low, Alarm condition triggered when the process variable is less than the Alarm Low Value or above the Hi Value.

If Band, Alarm condition triggered when the process variable is above or below the "band" set around the Setpoint. Band equals Hi Value (Low Value ignored). A "band" is set around the Setpoint only in the "Deviation" Mode.

Normally: if Open, then the relay is "energized" only when an alarm condition occurs.

If Closed, this is "Fail Safe" Mode. Relay is energized under "normal" conditions and becomes de-energized during alarm or power failure.

Latch: if Latched, Alarm remains "latched" until reset.

If Unlatched, Alarm remains latched only as long as the alarm condition is true. Absolute: if Absolute, this allows Alarms to function independently from their respective Setpoints. If the process being monitored does not change often, then "Absolute" Mode is recommended.

If Deviation, this allows changes to Setpoints to be made automatically to their corresponding Alarms. Deviation Mode is typically the ideal mode if the process temperature changes often. In Deviation Mode, set Alarm 1 a certain number of degrees or counts away from Setpoints, this relation remains fixed even if Setpoints are changed.

Alarm at Power On: If the alarm is enabled at Power On, the alarm will be active right after reset for all the End Devices (given the conditions are met), except the End Device designated in the "Input" menu of the Web Server.

If the alarm is disabled at Power On, the alarm will become enabled when the process value enters the non alarm area. The alarm is not active while the process value is approaching the Setpoints.

Errors indicating "lost" or "open" sensor condition can trigger the alarm if the alarm is set for "active high" above 9000 degrees.

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