WDP440-522U Walchem (WDP440-522U)
The Walchem WDP440-522U controller is now obsolete and the closest equivalent is the WPH640HSSAN-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, hardwired, cable glands, two isolated analog (4-20 mA) outputs, 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 WPH640HSSAN-NN page or select a model more suited to your needs from the WPH600 series controller or one of the other pH controllers.