The Walchem WPH420-54NN controller is now obsolete and has been replaced by the WPH420-54NU controller which now has integrated USB datalogging and software upgrade capability. Otherwise, both the WPH420-54NN and the WPH420-54NU have the same specifications with proportional control outputs, hardwired, cable glands, single isolated analog (4-20 mA) output, none.
Please click here to view and/or purchase the new replacement controller and to view literature.
