Vega VEGAMET 861 - Measured value memory;data logger; Setting the measured value memory

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10 Measured value memory/data logger
VEGAMET 861 • 4 … 20 mA/HART
58866-EN-200401
10 Measured value memory/data logger
With the measured value memory, the measured values of a VEGA
instrumentcanberecordedandmonitored.Therearetwodierent
possibilities of measured value recording:
The data are saved over a certain period in the instrument and can
bereadoutagainlateron.ViaPACTwareandDTMdierentrecord-
ing conditions can be set and the process can be started or stopped.
The max. recording period is limited by the memory of the controller.
Themax.recordingperioddiersdependingontherecordingtype
(intervalormeasuredvaluedierence).
When recording with interval, a total of 174,000 measured values can
berecorded,whenrecordingwithmeasuredvaluedierence,the
value is reduced to 131,000. If measured values are stored in intervals
of e.g. one minute, this results in a duration of 120 days. If more than
one curve is recorded, this time is reduced accordingly.
Note:
Therecordeddataarewritteninaperiodoftwotoveminutesfrom
theinternalRAMtoaashdisk.Incaseofvoltagefailure,recordings
of the last minutes can get lost.
The data are only saved on the PC during an online connection with
PACTware and DTM. The max. recording period is limited only by the
storage space on the hard disc.
10.1 Setting the measured value memory
The settings are carried out in the DTM under the menu item "Di-
agnostics - Measured value memory - Settings". Up to 3 curves are
available. If required, these curves are activated or deactivated/delet-
ed on this side. By pushing the button "Add", an installation assistant
for creating the selected curve is started. The following settings are
carried out step-by-step:
Intherststepyouhavetoselecttherequestedmeasurementloop
and the measured value.
Here you set the requested recording interval. The following options
are possible:
•
"In time interval": Recording is carried out in certain adjustable
time intervals
•
"Withmeasuredvaluedierence": Recording is carried out meas-
uredvaluedependentwithadjustablemeasuredvaluedierence
A combination of the two recording modes is also possible.
Toenableaspecicmonitoring,thestartandstopconditionscanbe
set for the recording in dependence on the current measured value.
If a start condition is met, the recording starts in the instrument. The
current recording stops as soon as the stop condition is reached. If
thestartconditionisfullledagain,therecordingdoesnotswitchon
again.
Measured value memory
Measured value memory
(DTM)
Measurement loop/Meas-
ured value
Recording mode
Start/Stop conditions