ADS Environmental Services XiLog+ QR 775026 A0 - Manual (Page 50)

ADS XiLog+ System User Manual
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Threshold Alarms
Threshold alarms generally involve designating a high and/or low threshold
beyond or below which the XiLog+ will generate an alarm. This section
includes descriptions for the parameters that are common only to threshold
alarms.
Low Threshold
This field represents the threshold below which the logger will trigger a low
alarm. Enter the threshold manually or use the up/down arrows.
High Threshold
This field represents the threshold above which the logger will trigger a high
alarm. Enter the threshold manually or use the up/down arrows.
Profile and Envelope Alarms
Profile and Envelope alarms are more complex alarms that involve
designating a different threshold value for the high and low alarms for every
15-minute increment throughout the day. For example, the high thresholds
designated for generating flow alarms may be much lower through the night
than during the day.
Selecting either option displays a graph for creating and editing the profile or
envelope.
Importing sample data from the database
The simplest way to establish a profile or envelope alarm is to import
historical data from the site in the following way:
1. Select the appropriate logging function from the Available Data list.
2. Select the radio button corresponding to the option for the number of
days for which to import data.
 Single day Choose this option to import data for only one day,
and then designate the date for which to import the data using the
Start Date calendar control.