Process fluid temperature measurement system with improved process intrusion

A method of detecting process fluid temperature within a conduit, the method comprising:

• coupling a thermowell through a wall of the conduit;
• sensing a first temperature using a first temperature sensitive element at a position within the thermowell;
• sensing a second temperature using a second temperature sensitive element at position within the thermowell that is spaced from the first temperature sensitive element by a spacer having a known thermal conductivity;
• and
• performing a heat flux calculation using the first and second sensed temperatures to provide a process fluid temperature output.

A process fluid temperature measurement system comprising:

• a thermally-insulative collar configured to mount to an aperture in the conduit wall;
• a thermowell configured to couple to the thermally-insulative collar and extend through the wall;
• a temperature sensor assembly disposed within the thermowell, the temperature sensitive assembly including at least one temperature sensitive element;
• and
• transmitter circuitry coupled to the at least one temperature sensitive element and configured to provide a process fluid temperature output.