Patent ID: 11946823
Assignee: MKS INSTRUMENTS, INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A thermal conductivity gauge for measuring gas pressure, comprising:
a sensor wire within a chamber coupled to a terminal and a grounded envelope encompassing a volume of the chamber;
a resistor coupled between the terminal and an electrical input receiving a power input;
at least one temperature sensor positioned external of the chamber configured to measure the temperature of at least one of the grounded envelop and the ambient temperature outside of the chamber; and
a controller configured to 1) apply the power input to the resistor; 2) adjust the power input, as a function of a voltage at the terminal and a voltage at the electrical input, to bring the sensor wire to a target temperature; and 3) determine a measure of gas pressure within the chamber based on an adjusted power input at the target temperature.