Sutron Corporation X-Link Operations & Maintenance Manual, Rev 1.63 5/24/2016 pg. 66
The system will log once every two minutes when in alarm, and once an hour
when not in alarm.
Measurement Interval = 00:02:00
Logging Interval = 01:00:00
Alarm Logging = Every Measurement
Alarm 1 = Hi
Threshold = 20
6.1.1.6.
Alarm ROC Interval
This setting affects ROC (Rate of Change) alarms. When set to
Since Last Meas
the system will compare two consecutive scheduled readings when deciding
whether to trigger alarms.
When it is set to
Since Last Tx
, the system will compare the current sensor
reading with the last transmitted reading. If there is no past transmission, the
first reading made after boot up is used.
6.1.2.
Alarm Computation Details
This section contains details on how X-Link decides whether to go into alarms.
The section is broken down by the user chosen
Alarm Type
setting:
6.1.2.1.
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.
6.1.2.2.
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.
6.1.2.3.
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.
