6 Commissioning, operation
54 WIKA Operating Instruction, Pascal ET, ET-P, ET/IS, ET-P/IS
GB
Here the user has the possibility to change some parameter by pushing on the value on the right
side of the screen (the ones shown
with ‘:’ the arrows at the bottom of the screen display further
parameters.
They changeable parameters can be: TAG, DESCRIPTOR, PV decimals units, PV LRV and PV
URV.
Press, for example, the button for the TAG value: the following screen appears:
If desired delete all the characters with backspace and insert the desired. After press ENTER to
store the parameter inside the HART transmitter; the Pascal will return to the previous display.
IMPORTANT NOTE: HART requires that all the characters must be in upper case in order to
be properly stored.
6.3.2.8 HART trimmer calibration
When the HART transmitter needs to be recalibrated or adjusted the HART screen shows two
types of possibilities:
-
ADJ.SCL
-
CAL.TRIM (Z,S)
With CAL.TRIM user can correct the analog mA generation, of the HART transmitter, referred to
the digital AO value displayed if the output DAC goes out of tolerance.
Zero and Span needs to be corrected.
If the user wants to recalibrate the Trim. an INPUT mA measurement channel has to configured as
REF channel. In addition, the loop wiring needs to flow to the IN mA terminals.
If no REF mA Input channel is configured first an error will be shown.