The Walchem WCMWDC series controller is now obsolete and has been replaced by the WBL600 series controller. The new series has upgraded features; for reference, here is the description of the old series:
Condensate Controller: Single or Dual
Control: Up to 5 on/off relays
Output: 4-20mA
With up to two conductivity electrodes, two analog outputs and five on/off relays.