The Walchem WMT8111-1NNNNN controller is now obsolete and the replacement is the WCT900 controller. The new series has upgraded features; for reference, here is the description of the old model:
WebMaster cooling tower controller, conductivity: contacting PP/graphite electrode 140 PSI, pH sensor: flat surface 100 PSI, makeup conductivity: contacting PP/graphite electrode 140 PSI, prewired w/ USA cords, 7 powered relays, 1 dry contact relay, no flow switch, with in-line mtg hardware, no analog outputs, 6 digital inputs, USB & Ethernet comms software/hardware, no add'l comms hardware, no add'l comms software.
