The Walchem WEC310-1NN controller is now obsolete and has been replaced by the WEC410-1NNU controller which now has integrated USB datalogging and software upgrade capability. Otherwise, both the WEC310-1NN and the WEC410-1NNU have the same specifications with 120 VAC, prewired, no 4-20 mA output, no sensor.
Please click here to view and/or purchase the new replacement controller and to view literature.