User's Manual

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5.4 Alarm Settings:
The Alarm Settings page has the Alarm 1, 2, 3 Setups, Relays and Event Log submenus
shown in Figure 5-6. Alarm 1, Alarm 2 and Alarm 3/Fail menus are identical and therefore
described only once in this section.
IMPORTANT: Alarm functions and their associated LED’s are always active.
Set Point enters the engineering unit value where the alarm trips. It may be negative and trip
when monitored values fall out of range in this direction. A3 has a default negative 5% of range
Set Point with Low Trip set for YES. This makes it function as a FAULT alarm and trip when the
monitored value is more than 5% “out of range”.
Dead-Band has a minimum value of 1% and a maximum value of 10%. It is useful for preventing
alarm cycling when the monitored value is hovering around the set point. EXAMPLE: With a
range of 0-100 ppm, if Dead-Band equals 5% and the set point is 20 ppm, after tripping at 20 ppm
the value must drop below 15 ppm to reset.
ON Delay allows entering a maximum 10 second delay before this alarm becomes active. This is
useful for preventing nuisance alarms caused by brief spikes beyond the set point.
OFF Delay allows entering a maximum 120 minute delay before clearing an alarm after the alarm
condition is gone. This is useful for continuing an alarm function, such as operation of an exhaust
fan, for a period of time after the alarm condition clears.
Low Trip set to YES causes the alarm to trip as the value falls below the set point.
Latching set to YES causes the alarm to remain active even after the condition is gone and only
reset when the UP / RESET key is activated from a data display.