The Walchem WPH320-1NN controller is now obsolete and has been replaced by the WPH420-1NNU controller which now has integrated USB datalogging and software upgrade capability. Otherwise, both the WPH320-1NN and the WPH420-1NNU have the same specifications with proportional control outputs, 120 VAC, pre-wired with 6” pigtails (wph410) or with 10’ cables (wph420), no 4-20 mA output, none.
Please click here to view and/or purchase the new replacement controller and to view literature.
