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    • 7. 发明授权
    • Temperature transmitter with on-line calibration using johnson noise
    • 温度变送器,使用约翰逊噪声进行在线校准
    • US5746511A
    • 1998-05-05
    • US582514
    • 1996-01-03
    • Evren EryurekGary Lenz
    • Evren EryurekGary Lenz
    • G01K7/30G01K15/00
    • G01K15/00G01K7/30
    • A temperature transmitter and a process control system includes a sensor input for coupling to a temperature sensor having a temperature dependent resistance. The resistance measuring circuitry couples to the sensor input and provides a resistance output related to resistance of the temperature dependent resistance. Analog to digital conversion circuitry couples to the sensor input and provides a digital output related to AC signals across the sensor input. Digital signal processing circuitry isolates a Johnson noise component of the AC signals and provides a digitized Johnson noise output. Temperature measurement circuitry provides a calibrated temperature output based upon the resistance output and the digitized Johnson noise output. Output circuitry transmits the calibrated temperature output over the process control loop.
    • 温度变送器和过程控制系统包括用于耦合到具有温度依赖性电阻的温度传感器的传感器输入。 电阻测量电路耦合到传感器输入,并提供与温度依赖电阻的电阻相关的电阻输出。 模数转换电路耦合到传感器输入,并提供与传感器输入端的交流信号相关的数字输出。 数字信号处理电路隔离交流信号的约翰逊噪声分量,并提供数字化约翰逊噪声输出。 温度测量电路提供基于电阻输出和数字化约翰逊噪声输出的校准温度输出。 输出电路通过过程控制回路传输校准温度输出。
    • 9. 发明授权
    • Diagnostics for resistance based transmitter
    • 基于电阻的变送器诊断
    • US5828567A
    • 1998-10-27
    • US744980
    • 1996-11-07
    • Evren EryurekGary Lenz
    • Evren EryurekGary Lenz
    • G08C25/00G01K15/00G05B9/03G07C3/00G08C19/02G06F19/00
    • G08C19/02G01K15/00G05B9/03G07C3/00Y10S706/903
    • Transmitter in a process control system includes a resistance sensor sensing a process variable and providing a sensor output. Sensor monitoring circuitry coupled to the sensor provides a secondary signal related to the sensor. Analog-to-digital conversion circuitry coupled to the sensor output and the sensor monitoring circuitry provides a digitized sensor output and a digitized secondary signal. Output circuitry coupled to a process control loop transmits a residual life estimate related to residual life of the sensor. A memory stores a set of expected results related to the secondary signal and to the sensor. Diagnostic circuitry provides the residual life estimate as a function of the expected results stored in the memory, the digitized sensor output and the digitized secondary signal.
    • 过程控制系统中的变送器包括感测过程变量并提供传感器输出的电阻传感器。 耦合到传感器的传感器监测电路提供与传感器相关的辅助信号。 耦合到传感器输出和传感器监测电路的模数转换电路提供数字化的传感器输出和数字化的辅助信号。 耦合到过程控制回路的输出电路传输与传感器的剩余寿命相关的剩余寿命估计。 存储器存储与二次信号和传感器相关的一组预期结果。 诊断电路根据存储在存储器中的预期结果,数字化传感器输出和数字化辅助信号提供剩余寿命估计。