Abstract: A vibratory sensor (5) includes a vibratory element (104), a receiver circuit (134) that receives a vibration signal from the vibratory element (104), and a drive circuit (138) that generates a drive signal. The drive circuit (138) includes a closed-loop drive (143) and an open-loop drive (147). The meter electronics (20) vibrates the vibratory element (104) commencing at a commanded first frequency and in an open-loop manner to achieve a first target phase difference ?1 for a fluid being characterized and determines a corresponding first frequency point ?1, vibrates the vibratory element (104) commencing at a commanded second frequency and in the open-loop manner to achieve a second target phase difference ?2 and determines a corresponding second frequency point ?2, and determines a viscosity of the fluid being characterized using the first frequency point ?1 and the second frequency point ?2.

Abstract: A method (600) of generating a drive signal for a vibratory sensor (5) is provided. The method (600) includes vibrating a vibratory element (104, 510) configured to provide a vibration signal, receiving the vibration signal from the vibratory element (104, 510) with a receiver circuit (134), generating a drive signal that vibrates the vibratory element (104, 510) with a driver circuit (138) coupled to the receiver circuit (134) and the vibratory element (104, 510), and comparing a phase of the generated drive signal with a phase of the vibration signal.

Abstract: An opto-isolation circuit (300) is provided, including an optocoupler (303) configured to optically transfer a raw output signal, a conversion circuit (317) coupled to an optocoupler output and configured to convert the raw output signal into a predetermined converted signal, and a control circuit (306) coupled to the optocoupler output. The control circuit (306) is configured to generate an autonomous control signal from the raw output signal after the raw output signal passes through the optocoupler (303), wherein the autonomous control signal is generated only if the raw output signal exceeds a predetermined conversion threshold, and control the conversion circuit (317) and convert the raw output signal into the predetermined converted signal if the autonomous control signal is generated by the control circuit (306) and output the raw output signal to an output port if the autonomous control signal is not generated by the control circuit (306).

Abstract: A vibratory meter (5) is provided, including one or more flow conduits (103), one or more pickoff sensors (105, 105?), and a driver (104). Meter electronics (20) is configured to vibrate the one or more flow conduits (103) using a drive signal including an initial vibration frequency and to receive a pickoff sensor signal from the one or more pickoff sensors (105, 105?) in response, iteratively offset a phase difference between the drive signal and the pickoff sensor signal by a predetermined phase increment and measure a resulting vibrational frequency and amplitude, with the offsetting operatively sweeping the vibration frequency over a predetermined vibration frequency range and therefore generating a plurality of vibration amplitudes and a corresponding plurality of vibration frequencies, and determine a substantially maximum amplitude response in the plurality of vibration amplitudes and designate the corresponding vibration frequency as comprising the resonant frequency.

Abstract: An opto-isolation circuit (300) is provided, including an optocoupler (303) configured to optically transfer a raw output signal, a conversion circuit (317) coupled to an optocoupler output and configured to convert the raw output signal into a predetermined converted signal, and a control circuit (306) coupled to the optocoupler output. The control circuit (306) is configured to generate an autonomous control signal from the raw output signal after the raw output signal passes through the optocoupler (303), wherein the autonomous control signal is generated only if the raw output signal exceeds a predetermined conversion threshold, and control the conversion circuit (317) and convert the raw output signal into the predetermined converted signal if the autonomous control signal is generated by the control circuit (306) and output the raw output signal to an output port if the autonomous control signal is not generated by the control circuit (306).

Abstract: A multiple temperature sensor system (120) includes a temperature sensor network (180) including temperature-sensing resistors RT1 and RT2 (186, 187) and frequency-selective filters (184, 185) coupled to the plurality of temperature-sensing resistors RT1 and RT2 (186, 187). The frequency-selective filters (184, 185) pass distinct time-varying signals into the temperature sensor network (180) and pass attenuated distinct time-varying signals out. The system (120) further includes a temperature measurement N controller (161) coupled to the temperature sensor network (180) and configured to inject the distinct time-varying signals into the temperature sensor network (180), receive the attenuated distinct time-varying signals in response to the injection, with the attenuated distinct time-varying signals being attenuated by the temperature sensing resistors (186, 187), and generate two or more substantially simultaneous temperature values from the attenuated distinct time-varying signals.