WDP440-142U Walchem (WDP440-142U)
The Walchem WDP440-142U controller is now obsolete and the closest equivalent is the WPH640PSSAN-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), single isolated analog (4-20 mA) output, two submersion flat ph electrodes without auto temp comp, integrated datalogging and config file import/export via USB flash stick.
Choose the new model on our WPH640PSSAN-NN page or select a model more suited to your needs from the WPH600 series controller or one of the other pH controllers.