In situ heated process probe
AssigneeRosemount Analytical Inc.
InventorsJames D. Kramer, Joseph C. Nemer, Douglas E. Simmers
Life of this patent
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Abstract
A process combustion transmitter is provided. The transmitter includes a process probe extendible into a flow of process combustion exhaust. The process probe has a measurement cell with an operating temperature that is above a flashpoint of process combustion fuel. The process probe includes a heater configured to heat the measurement cell to the operating temperature. Electronic circuitry is coupled to the measurement cell and to the heater. The electronic circuitry is configured to disengage power to the heater once process combustion heat is sufficient to maintain the measurement cell at the operating temperature and thereafter to maintain the heater in a de-energized state.
Claims15
A process combustion transmitter comprising;
- a process probe extendible into a flow of process combustion exhaust, the process probe having a measurement cell with an operating temperature that is above a flashpoint of process combustion fuel, wherein the process probe includes a heater configured to heat the measurement cell to the operating temperature;
- and
- electronic circuitry coupled to the measurement cell and to the heater, the electronic circuitry being configured to disengage power to the heater once process combustion heat is sufficient to maintain the measurement cell at the operating temperature, and thereafter to maintain the heater in a de-energized state.
A method of operating an in situ process combustion transmitter having a measurement cell with an operating temperature above a flashpoint of combustion fuel, the method comprising:
- initializing the transmitter to begin providing a process combustion variable output and to heat the measurement cell to the operating temperature;
- determining whether process combustion heat is sufficient to maintain the measurement cell at or above the operating temperature;
- placing the heater in a de-energized state when the process combustion heat is sufficient to maintain the measurement cell at or above the operating temperature and thereafter maintaining the heater in the de-energized state.
Dependencies are inferred from the claim text.