Sensor failure mode - PENN Controls - LIT-12011972 - A421ABC - A421ABG - A421ABJ - A421AEC - A421AEJ - A421GBF - A421GEF - Electronic Temperature Control - A421 Standard Model

A421 Series Standard Electronic Temperature Controls with and without Power Cords Product Bulletin
Brand
PENN Controls
Product name
A421 Standard Model
Document type
Product Bulletin
Document number
LIT-12011972
Revision date
2023-01-09
Language
English

The sensor failure mode defines how the A421 control operates the equipment in the event of a sensor or sensor-wiring failure. The A421 control can be set to run the equipment continuously or to shut it down if the sensor or sensor wire fails. When a failure is detected, SF flashes alternately with OP on the LCD if the sensor circuit is open, or SF and SH if the sensor circuit is shorted.