The Walchem WPH310-522 controller is now obsolete and has been replaced by the WPH410-522U controller which now has integrated USB datalogging and software upgrade capability. Otherwise, both the WPH310-522 and the WPH410-522U have the same specifications with on/off control outputs, hardwired, cable glands, two isolated analog (4-20 mA) outputs, submersion flat ph electrode w/preamp (wel-phf-21).
Please click here to view and/or purchase the new replacement controller and to view literature.
