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7.4
Connecting the mA-output
An active and isolated mA-output signal (mA+ and mA-) is used to transfer an analog 4-20 mA current signal
that describes the measurement value.
After the default auto-setup procedure, the normal signal level is set to be 5% of the scale (i.e. 4.8 mA). Thus, a
max signal level of 20 mA indicates a 20-fold increase in dust levels since auto-setup. The scale of mA-output
can also be customized according to the end user application.
An mA-output loop is intended to be used as a long-range analog data transfer in industrial environments. The
signal output is isolated to shield against local potential differences between the two end locations.
The device will also alarm on the mA output for device failures according to NAMUR NE 43.
mA output
State
4...20 mA
Normal measurement or Span/Zero self-test (relays indicating maintenance mode)
Over 22 mA
Failure, measurement grounded or device failure. Clean probe as instructed in
Maintenance –section.
Figure 13: mA loop connection
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