The Walchem WDP410-1NNN controller is now obsolete and has been replaced by the WDP410-1NNU controller which now has integrated USB datalogging and software upgrade capability. Otherwise, both the WDP410-1NNN and the WDP410-1NNU have the same specifications with 4 powered on/off relays & 1 powered dedicated alarm relay, 120 VAC, prewired, 6” pigtails to powered relays, no 4-20 mA output, no electrode, no USB.
Please click here to view and/or purchase the new replacement controller and to view literature.
