US 12,467,800 B2
Heat flow-based process fluid temperature estimation system with thermal time response improvement
Charles R. Willcox, Hopkins, MN (US)
Assigned to Rosemount Inc., Shakopee, MN (US)
Filed by Rosemount Inc., Shakopee, MN (US)
Filed on Jun. 24, 2022, as Appl. No. 17/848,625.
Claims priority of provisional application 63/215,033, filed on Jun. 25, 2021.
Prior Publication US 2022/0412815 A1, Dec. 29, 2022
Int. Cl. G01K 1/143 (2021.01); G01K 7/42 (2006.01); G01K 13/02 (2021.01)
CPC G01K 13/02 (2013.01) [G01K 1/143 (2013.01); G01K 7/427 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A process fluid temperature estimation system comprising:
a mounting assembly configured to mount the process fluid temperature estimation system to an external surface of a process fluid conduit:
a sensor capsule having at least one temperature sensitive element disposed therein and configured to sense at least a temperature of the external surface of the process fluid conduit;
measurement circuitry coupled to the sensor capsule and configured to detect a characteristic of the at least one temperature sensitive element that varies with temperature and provide sensor capsule temperature information;
a controller coupled to the measurement circuitry, the controller being configured to obtain a temperature measurement of the external surface of the process fluid conduit and to obtain a reference temperature and employ a heat transfer calculation with the reference temperature, the external surface temperature measurement and a known thermal relationship between the external surface temperature sensor in the sensor capsule and the reference temperature to generate an estimated process fluid temperature output;
wherein the controller is configured to obtain a system response function that models a system time constant (τ) and utilize the system response function to adjust the estimated process fluid temperature output; and
wherein the controller is configured to employ a plurality of discretized differential equations and is configured to select one of the plurality of discretized differential equations based on a type of thermal change.