Analog input PH, EC, and TDS probes

[Maholobob 0]

The tds (total dissolved solids) probe and temp probe are one unit the ph is separate. Elc-an04annn card how do I set these up for the plc to read, from what I understand they need a 4-20ma transmitter....can anyone one shed some light on this or point me in the right direction? This is for a saltwater aquarium for what it's worth.

[RussB 22]

Not enough information for me to help. I suggest checking with the manufacturer on what exact specifications each of the analog signals consists of and/or parameters that may configure them. From there select the analog input device to match.