Metrohm 823 Membrane Pump Unit - Manual (Page 20)

3.3 Connecting the membrane pump
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Note
Ensure the correct polarity of the banana plugs. The red plug (positive
pole) belongs in the red socket, the black plug (negative pole) belongs
in the black socket.
Note
For information on controlling the 823 Membrane Pump Unit using the
731 Relay Box and a suitable control device, refer to the manual of the
731 Relay Box.