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#2
03-11-2009, 11:37 PM
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Hi,
Try http://www.vernier.com/probes/ for all the probes you could ever wish for! Not a bad price either. You will need some sort of gain circuit or a/d conversion to make them work on PLC's. Also you will need to poll some of those probes one at a time and take a reading as some of the probes conduct a small current through the water and if 2 are operating at the same time, you will get erroneous readings. Polling should be a sinch with a PLC though. Hope this helps! VR
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View my Aquarium & Reef Controller build here:  The Ultimate DIY Aquarium Controller of the 21st Century!!! LED's, PH, Salinity, Clock, LCD, ATO, Auto Water Changer, Variable Speed Cooling Fan Control and lots, lots more...... Last edited by Vancouver Reefer; 03-12-2009 at 01:01 AM. 
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