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The subject matter of this specification can be embodied in, among other things, a positioning device that includes an actuator assembly configured to actuate an output shaft based on an input signal, and a position sensor assembly. The position sensor assembly includes a position sensor configured

The subject matter of this specification can be embodied in, among other things, a positioning device that includes an actuator assembly configured to actuate an output shaft based on an input signal, and a position sensor assembly. The position sensor assembly includes a position sensor configured to detect a position of an input shaft not directly coupled to the output shaft, a first input receiver configured to receive the input signal, a first output transmitter configured to provide an output signal based on the position of the input shaft, and a second output transmitter configured to provide another output signal indicative of a failure of at least one of the input shaft and the output shaft. A moveable member is coupled to both the output shaft and the input shaft and is configured to alter the positional configuration of the input shaft and to be actuated by the output shaft.

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1. A positioning device comprising: an actuator assembly coupled to a first axial end of an output shaft and configured to actuate the output shaft based on an input signal;a position sensor assembly comprising: a position sensor configured to detect a positional configuration of a second axial end

1. A positioning device comprising: an actuator assembly coupled to a first axial end of an output shaft and configured to actuate the output shaft based on an input signal;a position sensor assembly comprising: a position sensor configured to detect a positional configuration of a second axial end of an input shaft proximal the first axial end and not directly coupled to the output shaft;a first input receiver configured to receive the input signal;a first output transmitter configured to provide a first output signal based on the positional configuration of the input shaft; anda second output transmitter configured to provide a second output signal indicative of a failure of at least one of the input shaft and the output shaft based on a comparison of the input signal and the positional configuration;a moveable member coupled to both the output shaft, at a third axial end opposite the first axial end, and the input shaft, at a fourth axial end opposite the second axial end, and spaced apart from both the actuator assembly and the position sensor, the moveable member being configured to alter the positional configuration of the input shaft and being configured to be actuated by the output shaft. 2. The device of claim 1, wherein the input shaft and the output shaft are concentric. 3. The device of claim 1, further comprising a housing arranged about the actuator assembly and the position sensor. 4. The device of claim 1, wherein the actuator assembly defines a cavity and the position sensor is arranged within the cavity. 5. The device of claim 1, further comprising a valve assembly comprising a housing and a valve, wherein the moveable member is coupled to the valve. 6. The device of claim 1, wherein the actuator is a rotary valve fluid actuator. 7. The device of claim 1, wherein the actuator is a rotary vane fluid actuator. 8. A positioning device comprising: a moveable member coupled to a first shaft and a second shaft not directly coupled to the first shaft;an actuator assembly spaced apart from the moveable member and coupled to the first shaft, wherein the first shaft is configured to alter a positional configuration of the moveable member based on an input signal;a position sensor spaced apart from the moveable member and coupled to the second shaft, configured to detect a positional configuration of the second shaft, wherein the moveable member is configured to alter the positional configuration of the second shaft based on the positional configuration of the moveable member;a first output configured to provide a first output signal based on the positional configuration of the second shaft; anda second output configured to provide a second output signal indicative of a failure of the actuator assembly to alter the positional configuration of the second shaft through the moveable member, based on a comparison of the input signal and the positional configuration. 9. The device of claim 8, further comprising a housing arranged about the actuator assembly and the position sensor. 10. The device of claim 8, wherein the actuator assembly defines a cavity and the position sensor is arranged within the cavity. 11. The device of claim 8, further comprising a valve assembly comprising a housing and a valve, wherein the moveable member is coupled to the valve. 12. The device of claim 8, wherein the actuator is a rotary valve fluid actuator. 13. The device of claim 8, wherein the actuator is a rotary vane fluid actuator. 14. The device of claim 8, wherein the first shaft is an input shaft that is rotatably coupled to the actuator assembly and the moveable member, and the second shaft is an output shaft that is rotatably coupled to the position sensor and the moveable member. 15. The device of claim 14, wherein the input shaft and the output shaft are concentric. 16. A method of operating a positioning device, the method comprising: providing an actuator assembly coupled to a first axial end of an output shaft and configured to actuate the output shaft;providing a position sensor configured to detect the positional configuration of a second axial end of an input shaft proximal the first axial end;coupling a third axial end the output shaft, opposite the first axial end, indirectly to the input shaft at a fourth axial end of the output shaft opposite the second axial end through a moveable member spaced apart from both the actuator assembly and the position sensor, the moveable member being configured to alter the positional configuration of the input shaft and being configured to be actuated by the output shaft;actuating the output shaft in response to an input signal;actuating, by the output shaft, the moveable member;altering, by the moveable member; the positional configuration of the input shaft;detecting, by the position sensor, the positional configuration of the input shaft; andproviding a first output signal based on the detected positional configuration. 17. The method of claim 16, wherein the input shaft and the output shaft are concentric. 18. The method of claim 16, wherein the actuator assembly defines a cavity and the position sensor is arranged within the cavity. 19. The method of claim 16, wherein the positioning device further comprises a valve assembly comprising a housing and a valve, wherein the moveable member is coupled to the valve. 20. The method of claim 16, further comprising: comparing the input signal to the first output signal;determining a positional error based on the input signal and the first output signal; andupdating the input signal based on the positional error. 21. The method of claim 20, further comprising: determining that the positional error is greater than a threshold positional error limit; andproviding a second output signal.