ADS Environmental Services IntelliServe 2.8.1 950026A7 - Manual (Page 46)

3-8 IntelliServe
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User’s Guide
CONFIDENTIAL – Covered by ADS Terms of Use and Confidentiality Agreement in Contract
© 2010 ADS LLC. All Rights Reserved.
5. Continue repeating Step 4 to acknowledge each alarm for the selected
location. If multiple alarms are occurring simultaneously, audible
notification continues until every alarm is acknowledged.
Deadbands
Some alarms may persist without returning to normal once flow conditions fall
below the specified threshold that originally initiated the alarm. This can occur
because many events include an established deadband that exists around the
threshold to prevent the system from alarming repeatedly when flows fluctuate
around the threshold. The deadband ensures that an alarm does not return to
normal until readings occur outside the deadband in the pre-alarm range.
For example, assume the flow in a 12-inch pipe begins to surcharge,
completely filling the pipe and traveling up the manhole. Based on this
condition, IntelliServe initiates an alarm for that location. IntelliServe is
designed to ensure that a surcharge alarm does not stop until the flow recedes
to 2 inches below the pipe height (10 inches) for 4 consecutive readings.
Therefore, an alarm will persist if depth readings fall only to 11 inches.
However, if the depth readings fall to 9 inches or less for 4 consecutive
readings, IntelliServe will discontinue and clear the alarming condition.
Refer to Appendix A, Events, for details concerning alarm thresholds and
deadbands for the following events: Surcharge Conditions, Flow Imbalance in
Network, Possible Backwater Conditions, and Loss of Flow in Network.
Clearing Acknowledged Alarms
If an alarm does not clear automatically when acknowledged, you can click on
the (clear) or the button on the Active Alarm Log or the Flow
Monitor/Rain Gauge Active Alarms window to clear the alarm. When an
alarm is cleared, the system moves the alarm entry to the Alarm History Log.
In addition, the related map symbol (when applicable) changes to green or blue
once all alarms for the location have been cleared, indicating a Normal status.
Note: ADS does not recommend manually clearing alarms that
indicate a threshold has been exceeded at a location. In addition,
IntelliServe prevents users from manually clearing certain alarms.