US 2025/0306129 A1 · SENSOR AND SENSOR MIS-WIRING DIAGNOSTIC

Abstract

A temperature transmitter assembly includes a sensor and measurement circuitry. The sensor includes a first conductor, a second conductor, and a third conductor configured to provide leads for two thermocouples. The first conductor and the third conductor are leads for the first thermocouple and have a first measurement point at a first location. The second conductor and the third conductor are leads for the second thermocouple and have a second measurement point at a second location a distance from the first location at a surface of a process conduit. The measurement circuitry includes three terminals, a first terminal for the first conductor, a second terminal for the second conductor, and a third terminal for the third conductor. The measurement circuitry is configured to determine an output related to a temperature at each thermocouple measurement point, the output indicative of a wiring state of the three conductors to the three terminals.

Claims24

Dependent claims

A temperature transmitter assembly, comprising:

a sensor comprising a first conductor, a second conductor, and a third conductor configured to provide leads for two thermocouples, the first conductor and the third conductor being leads for the first thermocouple and having a first measurement point at a first location, and the second conductor and the third conductor being leads for the second thermocouple and having a second measurement point at a second location a distance from the first location and at a surface of a process conduit;
and
measurement circuitry comprising three terminals, a first terminal for the first conductor, a second terminal for the second conductor, and a third terminal for the third conductor, the measurement circuitry configured to determine an output related to a temperature at each thermocouple measurement point, the output indicative of a wiring state of the three conductors to the three terminals.

A method of diagnosing mis-wiring of first, second and third conductors for a three conductor sensor, the first conductor and the third conductor for a first thermocouple and the second conductor and the third conductor for a second thermocouple, the three conductors connected to first, second and third terminals of diagnostic circuitry, the method comprising:

measuring with diagnostic circuitry a first resistance between the first and third terminals and a second resistance between the second and third terminals;
measuring a first temperature at a first measurement point at a first location, and measuring a second temperature at a second measurement point a distance from the first measurement point at a surface of a process conduit;
measuring a reference temperature at the diagnostic circuitry;
and
identifying mis-wiring of the first, second, and third conductors to the first, second, and third terminals using at least one of the measured resistances and the measured temperatures.

2 more elements

Dependencies are inferred from the claim text.

Sensor and sensor mis-wiring diagnostic

Life of this patent

Sensor and sensor mis-wiring diagnostic

Life of this patent

Abstract

Claims24