Patent ID: 11874179
Assignee: TSI GROUP CO. LTD.
Field: Measurement (Instruments)
Classification: CPC G  F | IPC F  G

Claim 8:
9. A method of using a gas velocity sensor probe to measure gas flow velocity and temperature, the gas velocity sensor probe comprising:
a probe handle comprising a microprocessor controller and a first electrical connector, and
a replaceable probe tip comprising:
a housing;
a bridge circuit assembly located in the housing and comprising a bridge circuit coupled to an operational amplifier and a power output amplifier, the bridge circuit including a first leg with a heated velocity sensor and a first reference resistor, the velocity sensor configured to operate within a predefined overheat temperature range which is above an ambient temperature, the bridge circuit having a second leg comprised of reference resistors and a digitally controlled resistive element to dynamically adjust and maintain the resistance of the velocity sensor within the overheat temperature predefined range, the operational amplifier applying a DC voltage to enable the velocity sensor to be heated to a target temperature within the overheat temperature range;
a gas flow temperature sensor for measuring the temperature of the gas or air flow to be measured, located in the housing;
an analog to digital converter coupled to an output of the temperature sensor and to an output of the bridge circuit assembly, located in the housing; and
a second electrical connector that replaceably couples the replaceable probe tip to the first electrical connector of the probe handle.