In-Situ Tube 300R Telemetry System - Manual (Page 43)

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Maximum Threshold values should be positive, otherwise an increasing
parameter will always generate an alarm.
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Set Minimum Threshold values to large negative numbers to disable alarms for
decreasing values (see the green values above).
Probe Out of Range SMS Alarms in Absolute Mode
The Tube can send SMS (text) messages when alarms are triggered. SMS alarms are
enabled in the General Information, Parameters, and Functional Options section on the
Alarms tab.
Below is an example situation showing when SMS messages would be sent for the
"Reading from Probe Out of Range" alarm with the following settings.
In Absolute Mode, alarms and warnings occur when a measurement value is less than
the minimum threshold value or greater than the maximum threshold value.
The example shows three incidents labeled A, B, and C.
Incident A: No SMS alarm is sent. Only two consecutive measurements exceed the
alarm threshold, while the requirement set above is 3 consecutive measurements.
Incident B: An SMS alarm is sent on the third consecutive measurement exceeding the
alarm threshold (reading no. 6).
Incident C: An SMS alarm is sent on the third consecutive measurement exceeding the
alarm threshold (reading no. 8, 9, 10). A second SMS alarm is sent after the sixth
consecutive measurement (reading no. 11, 12, 13). While another three consecutive
measurements are above the alarm threshold (14, 15, 16), no SMS alarm is sent
because the maximum number of messages sent for the same incident is set at 2.