Patent ID: 11913977
Assignee: ROSEMOUNT AEROSPACE INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H  B | IPC B  G  H

Claim 11:
12. A method for determining a health status of a positive temperature coefficient resistor (PTCR) heater assembly, the method comprising:
providing an input voltage to the PTCR heater assembly;
sensing the input voltage at and a current through the PTCR heater assembly;
determining a baseline characteristic relating to an inrush peak of the PTCR heater assembly and based on the input voltage and the current;
determining an observed characteristic relating to the inrush peak of the PTCR heater assembly and based on the input voltage and the current;
comparing the observed characteristic to the baseline characteristic;
assessing a health status of the PTCR heater assembly based on the observed characteristic and the baseline characteristic; and
outputting the health status for PTCR heater assembly diagnostics and/or prognostics.