I'm not exactly sure what you're looking for but I'll try to help
Here's a picture of them (both in one picture)
PL-0871
PLM-4Level:
1 adjustable galvanically insulated input for pH-value probe or redox probe
2 inputs for level- or flow-sensors
PL-0872
PLM-4Level:
2 ports with 4 level inputs in sum (able to add 4 additional level or Flow inputs from a single card)
These should be available just about any time now from your local GHL dealer. I would think that if you plan to fully utilize the available level/flow ports you'll need the appropriate splitter for that per port: PL-LY (PL-0081)
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