Sutron Corporation Satlink Operations & Maintenance Manual, Rev 8.04.2 11/3/2016 pg. 94
9.6.1. Hi Alarm
When the Alarm Type is set to Hi, if the sensor reading is greater than or equal to Alarm
Threshold, the station goes into alarm.
That station will go out of alarm when the sensor reading goes below Alarm Threshold minus
Alarm Deadband.
9.6.2. Low Alarm
When the Alarm Type is set to Low, if the sensor reading is less than or equal to Alarm Threshold,
the station goes into alarm.
That station will go out of alarm when the sensor reading goes above Alarm Threshold plus Alarm
Deadband.
9.6.3. ROC Alarm
ROC stands for Rate Of Change. ROC alarms compare the current measurement reading with a
past reading. If Alarm ROC Interval is Since Last Meas, the past reading is the last scheduled
reading made according to Measurement Time and Measurement Interval.
If Alarm ROC Interval is Since Last Tx, the past reading is the one that was included in the last
alarm transmission. If there is no past transmission, the first reading made after boot up is used.
If the absolute difference between the two readings (absolute of current reading minus past
reading) is greater or equal to the Alarm Threshold, the station goes into alarm.
The same station goes out of alarm if the absolute difference between the two readings
(absolute of current reading minus past reading) is less than the Alarm Threshold minus Alarm
Deadband.
Exception: ROC alarms setup for Since Last Tx do not generate out of alarm events or
transmissions.
9.7. Logging Settings
9.7.1. Logging Interval
Logging Interval dictates how often to log sensor data.
Change the Logging Interval to measure sensors more frequently than to log them. This is useful
for alarm setups, in which you want to check the water level once a minute in order to detect
fast rising water, but one only wants to log the water level data once an hour. For this scenario,
the Measurement Interval would be one minute, and the Logging Interval would be one hour.
For alarm conditions, it is possible to set Alarm Logging to Every Reading. That would result in
the water level in the example above being logged once a minute when the system was in alarm,
and logging once only once an hour when not in alarm.
If Logging Interval is set to zero, Satlink will log every measurement. It is the same as having the
Logging Interval equal to the Measurement Interval.
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