Patent ID: 11930563
Assignee: ROSEMOUNT AEROSPACE INC.
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A method of monitoring a heating arrangement, the method comprising:
applying a first polarity DC voltage to a heater of the heating arrangement;
detecting a first polarity heating leakage current;
applying a second polarity DC voltage to the heating arrangement;
detecting a second polarity heating leakage current;
determining a health of the heating arrangement based on the first polarity heating leakage current and the second polarity heating leakage current;
generating, via a polarity control circuit, a heater voltage polarity signal indicative of a smaller one of the first polarity heating leakage current and the second polarity heating leakage current; and
applying to the heater, via a polarity selection circuit and based on the heater voltage polarity signal, either the first polarity heater DC voltage or the second polarity heater DC voltage until a system shutdown, thereby increasing useful life of the heating arrangement.