Sutron Corporation X-Link Operations & Maintenance Manual, Rev 1.63 5/24/2016 pg. 118
Event
Description
Failure
Time logged:
Logged only the first time the sensor fails and it gets logged
only once a day.
Value logged:
The value logged is the index of the measurement that failed.
9.2.1.
Logged Time
Measurements are not instant. Once initiated, a measurement takes the user-
defined averaging time, plus some overhead, to complete.
For measurements without averaging, t
he timestamp of the logged
measurement is the time the measurement was started.
The same is true for
transmissions. The timestamp of the transmission is the time when the
transmission process was started, not when it was completed.
This means that if a SDI-12 sensor takes 1 minute to provide a result, and the
measurement is setup to go every 15 minutes, the measurement will start at
00:15:00 and complete at 00:16:00. The logged data will have the timestamp of
00:15:00.
X-Link handles averaged readings in such a way that the last sample is collected
at
Meas Time + Meas Interval.
Please see the averaging section on page 70 for
details.