The Walchem WIND83-1NNNN controller is now obsolete and the replacement is the WIN900 controller. The new series has upgraded features; for reference, here is the description of the old model:
Multi I/O industrial water controller, three sensor inputs, prewired w/ USA cords, 7 powered relays, 1 dry contact relay, no analog outputs, 6 digital inputs, USB & Ethernet comms software/hardware, no add'l comms hardware, no add'l comms software.