28
4.7
Analogue output 3
Submenu
4.7.1 Calibration 4 mA
Selection:
Key functions can be used to set the current
Setting the output current and equalise it to the receiver side.
4.7.2 Calibration 20 mA
Selection:
Key functions can be used to set the current
Setting the output current and equalise it to the receiver side.
The current output can be calibrated so that the zero point (output of 4 mA) is set to the
background noise of the measuring point. If the background noise drops owing to process changes,
deposits on the sensor or other effects of ageing, less than 4 mA is output and the zero point offset
can be detected. (Zero point drift)
If this function is not desired for process engineering reasons, the zero point must be specified for
the calibration to a raw value of zero and/or the MIN limit (
4.1
) set to 4 mA.
