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New Capacitive Sensor Performance
Keywords: Performance, Transmitter, Thermal Gradiant
Thermal gradients in pressure transducers and transmitters often cause the output to deviate from the calibrated accuracy and persist until the temperature gradient across the device diminishes. Thermal gradients can be caused by gas pockets in the well, wireline activities, well testing, injection events, among other common activities. Rosemount Specialty Products (Paine) has implemented a sensor technology that exhibits extremely low thermal transient error in comparison to the industry leading technologies. The sensor comprises of a single crystal that incorporates a sensitive to pressure capacitor and a reference capacitor. The material of the sensor is insensitive to temperature effects and the direct thermal coupling of the reference allows for faster correction of any remaining errors. Packaging and electronics schemes have been developed for 175°C operation and testing. The electronics were designed to reduce added thermal error using self-calibrating gain and offset techniques as well as incorporating an onboard microcontroller to correct residual changes in the output from temperature. Opportunities exist for future development of higher temperatures electronics as the sensor is capable of more than 300°C. Novel packaging methods were developed to prevent additional errors caused by stress gradients, outgassing, thermoelectric, decomposition, and migration effects. This paper covers thermal transient testing against both a quartz crystal based sensor and a strain based sensor. Paine’s new sensor technology exhibits less thermal error, while maintaining similar accuracy and stability capability to the industry standards. A new product (420-22-0010) is slated to be released this year based on this new technology developed.
David Andrew, Research And Development Engineer
Rosemount Specialty Products
East Wenatchee, WA
USA


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