US 12,328,799 B2
System and method for calibrating a control system operating an electric heater
Matthew Yender, Winona, MN (US); Brian Geer, St. Louis, MO (US); Eric Meech, Winona, MN (US); Stanton H. Breitlow, Winona, MN (US); and Adam Kidney, Winona, MN (US)
Assigned to WATLOW ELECTRIC MANUFACTURING COMPANY, St. Louis, MO (US)
Filed by WATLOW ELECTRIC MANUFACTURING COMPANY, St. Louis, MO (US)
Filed on Apr. 18, 2024, as Appl. No. 18/639,026.
Application 18/639,026 is a division of application No. 16/894,236, filed on Jun. 5, 2020, granted, now 12,004,267.
Claims priority of provisional application 62/858,587, filed on Jun. 7, 2019.
Prior Publication US 2024/0267998 A1, Aug. 8, 2024
Int. Cl. H05B 1/02 (2006.01); H05B 3/26 (2006.01)
CPC H05B 1/023 (2013.01) [H05B 3/26 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for calibrating a control system configured to operate a two-wire heater, the two-wire heater being operable to generate heat and to function as a sensor for measuring temperature of the two-wire heater, the method comprising:
controlling, by the control system, the two-wire heater to a temperature setpoint from among a plurality of temperature setpoints;
concurrently acquiring voltage and current (V-I) characteristics of the two-wire heater from the control system and temperature dataset of the two-wire heater from a temperature sensor system, wherein the V-I characteristics and the temperature dataset are acquired for each of the plurality of temperature setpoints;
determining, for each of the plurality of temperature setpoints, a resistance of the two-wire heater based on the V-I characteristics acquired;
calculating, for each of the plurality of temperature setpoints, a temperature metrology data based on the temperature dataset acquired;
correlating the resistances of the two-wire heater and the temperature metrology data for the plurality of temperature setpoints; and
defining a resistance-temperature calibration reference for determining a working temperature of the two-wire heater based on a measured resistance of the two-wire heater.