Hart Scale Adjust - WIKA Pascal ET Betriebsanleitung

6. Commissioning, operation
Select, for example, the [CAL.TRIM S] button:
EN
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The HART instrument is put in fixed mode generation (4 or 20 mA) and the REF channel is measuring the true analogue mA
generation. To re-align to the correct 20 mA (or 4 mA) generation press [CALIBR.] button.
If needed follow the same procedure for "Zero Trim".

6.3.2.9 HART scale adjust

„ADJ.SCL" permits to align the range of PV to the lower and upper mA generation values.
The lower value of PV is the value at which the transmitter will generate the 4 mA nominal value, and the upper value is the
value at which the transmitter will generate the 20 mA nominal value.
Here is described the "automated" procedure that permits to align in "real-time" these values. The user can also change them
manually in the "HART data" page as seen before.
If the user wants to adjust the scale a channel of the same input type of the transmitter has to be configured as REF channel.
If no REF channel is configured first an error will be shown.
Press [ADJ.SCL] menu and the following is shown (assuming that we are using a Pt100 transmitter, a REF simulation Pt100
channel is configured as Channel B):
Set the REF channel to the desired value that permits to output by the transmitter the 4 mA value (for example 20 °C). When
the value is stable press the [ADJ.LRV] button.
Now set the REF channel to the desired value that permits to output the transmitter the 20 mA value (for example 150 °C).
When the value is stable press the [ADJ.URV] button.
Now the transmitter will generate 4 ... 20 mA between 20 ... 150 °C.
WIKA operating instructions, model Pascal ET 47