WDP440-1N1U Walchem (WDP440-1N1U)
The Walchem WDP440-1N1U controller is now obsolete and the closest equivalent is the WPH640PSSNN-NN controller. The new WPH600 series has upgraded features; for reference, here is the description of the old model:
pH/ORP controller, with 4 pulse proportional control outputs and diagnostic alarm relay, 120 VAC, pre-wired with 6” pigtails (if on/off) or with 10’ cables for e-class pumps (if pulse), no 4-20 mA output, two preamplifiers (190783) w/10 ft. cables, prewired, integrated datalogging and config file import/export via USB flash stick.
Choose the new model on our WPH640PSSNN-NN page or select a model more suited to your needs from the WPH600 series controller or one of the other pH controllers.