Vega VEGACAL 69 Operating Instructions Manual page 29

Trend recording
Service - Current output
VEGACAL 69 • Two-wire 4 ... 20 mA/HART
6 Set up with the display and adjustment module PLICSCOM
Measurement reliability
Sensor status
Up to 3000 measured values are recorded (depending on the sensor)
when starting a " Trend curve". Then the values can be displayed on
a time axis. The oldest measured values are always deleted.
The measured values displayed are in the unit pF.
Trend recording
Presentation of the trend
curve
Information:
The trend recording is not activated when being shipped. It must be
started by the user via the menu item " Start trend curve".
In the menu item " Current output" you determine the behaviour of the
current output during operation and in case of failure. The following
options are available:
Current output
Characteristics
Failure mode
1)
Min. current
2)
Max. current
3)
The values in bold font represent the data of the factory setting.
In HART multidrop mode, the current is constantly 4 mA. This value
does not change even in case of failure.
Current output
►
Characteristic: 4-20 mA
►
Failure mode: 22 mA
►
Min. current 3.8 mA
Value of the current output in case of failure, e.g. if no valid measured value is
1)
delivered.
This value is not underrun during operation.
2)
This value is not exceeded during operation.
3)
4 ... 20 mA
20 ... 4 mA
Hold value
20.5 mA
22 mA
< 3.6 mA
3.8 mA
4 mA
20 mA
20.5 mA
29