The Walchem WPH310-1N2 controller is now obsolete and has been replaced by the WPH410-1N2U controller which now has integrated USB datalogging and software upgrade capability. Otherwise, both the WPH310-1N2 and the WPH410-1N2U have the same specifications with on/off control outputs, 120 VAC, pre-wired with 6” pigtails (wph410) or with 10’ cables (wph420), no 4-20 mA output, 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.
