WIKA Operating Instructions Level Transmitter
– BLM-SF-FM
17
4.2.2.6 Calibration of the analogue output (DAC)
The current output of the transmitter is controlled internally by a digital-to-
analogue-converter (DAC). This DAC is calibrated ex works. If deviations
of the set current from the measured current are visible, they can be cor-
rected.
Therefore, an ampere meter is connected in series to the transmitter. After
access of the calibration routine, the analogue output of the transmitter is
switched to 4 mA and the measured current value is entered into the sen-
sor. The same procedure follows directly for the 20 mA point.
Access:
Setup -> 4-20 mA -> DAC -> Calibration
Remark:
The calibration of the DAC is not influenced by a reset to
works defaults.
Function
Description
Calibration of
the 4 mA point.
.
Calibration of
the 20 mA point.
.
