VEGA VEGAMET 625 - Manual (Page 21)

21
6 Setup with the integrated display and adjustment unit
VEGAMET 625 • Double channel HART
28970-EN-130701
instructions manual "RS232/Ethernet connection" and the online
help of the respective DTM.
Because VEGAMET 625 has two inputs, the measurement loops
must be assigned to the inputs. After the addresses of the HART sen-
sors are assigned, a list of the existing sensors can be prepared and
displayed via the sensor search. Now you can assign the requested
sensor to each measurement loop.
For transmission, VEGAMET 625 must be informed which "Sen-
sor value" should be used for further processing. Depending on the
sensor type this can be distance, pressure, interface or temperature.
When HART sensors of other manufacturers are connected, the op-
tions PV (Primary Value) and SV (Secondary Value) will be available.
Prerequisite is that the HART commands 0, 1, 3 and 15 are support-
ed. This information and which measured values should be transmit-
ted is stated in the operating instructions manual of the respective
sensor manufacturer.
The measured variable defines the applicaton of the measurement
loop, the following settings are available depending on the connected
sensor:
•
Level
•
Process pressure
•
Temperature
•
Difference (only with measurement loop 3)
•
Interface
•
Universal (for sensors of other manufacturers)
The third measurement loop is always a differential measurement
loop calculating the difference of the values of measurement loops 1
and 2 (optionally measurement loop 1-2 or 2-1).
Information:
Keep in mind that some settings must be carried out individually sev-
eral times, because they are specifically required for each measure-
ment loop.
Through the adjustment the input value of the connected sensor is
converted into a percentage value. This conversion step allows any
input value range to be depicted in a relative range (0 % up to 100 %).
Before carrying out the adjustment, the requested adjustment unit can
be selected which depends on the sensor type. With radar, ultrasonic
and guided microwave this is always the distance in metres or feet
"m(d)" or "ft(d)", and with pressure transmitters it is e.g. "bar" or "psi".
Measurement loop - Input
Meas. loop - Parameter
Meas. loop - Adjustment