A capacitive sensor includes a first conductive structure; a second conductive structure movable relative to the first conductive structure in response to an external force acting thereon, wherein the first and the second conductive structures form a first capacitor having a first capacitance that changes with a change in a distance between the first conductive structure and second conductive structure, wherein the first capacitance is representative of the external force; and a diagnostic circuit configured to detect a first leakage current in the capacitive sensor by measuring an first electrical parameter that is affected by the first leakage current and comparing the measured first electrical parameter to a first predetermined error threshold, wherein the diagnostic circuit is further configured to generate a first error signal in response to the measured first electrical parameter being greater than the first predetermined error threshold.

A system includes an optical pressure sensor. A controller is operatively connected to receive input from the optical pressure sensor. An output connection is operatively connected to communicate output data from the controller. The controller includes machine readable 5 instructions configured to cause the controller to receive data from an optical pressure sensor, detect an accumulation of contaminant on the optical pressure sensor, and initiate a corrective action through the output connection in response to detecting the accumulation of contaminant.

A method for diagnosing a differential pressure line of a differential pressure measurement arrangement includes capturing a first set number of differential pressure values, which represent a difference between a first media pressure and a second media pressure within a process, and checking whether the differential pressure measurement arrangement and/or the process are in a state that allows a diagnosis of the differential pressure line. Where it is determined that the differential pressure measurement arrangement and/or the process are not in a state that allows a diagnosis of the differential pressure line, the differential pressure values are captured anew such that the previously captured differential pressure values are deleted or overwritten. Otherwise, a diagnostic function to determine whether a differential pressure line is blocked is carried out.

Methods and systems for diagnosing a sensor can involve detecting a group of sensor signals output from a sensor, and differentiating from among the sensor signals to distinguish inequalities in the sensor signals for an indication of a potential fault in the sensor. A small sensor signal can be identified from a larger sensor signal among the sensor signals for the indication of the potential fault in the sensor. The sensor can include a group of piezo-resistive Wheatstone bridge elements, and in some embodiments, the sensor may be a pressure transmitter.

The invention relates to a method for monitoring the function of a capacitive pressure measuring cell (10) comprising a measuring capacitor (C.sub.M) and a reference capacitor (C.sub.R) as well as a temperature element, wherein in an evaluation unit the pressure measurement value p is obtained by forming the quotient Q from the capacitance values of the reference capacitor (C.sub.R) and the measuring capacitor (C.sub.M). The method is characterized by the following method steps: in a matching procedure the characteristic curve of the quotient Q and the capacitance values of the measuring capacitor (C.sub.M) are each stored in a lookup table versus the pressure and at different temperature scenarios; then the corresponding absolute value of the quotient Q and of the capacitance value of the measuring capacitor (C.sub.M) from the lookup table are continuously assigned respectively to the determined pressure measurement value p at the temperature detected at this moment by the temperature element; the behavior of the course of the two absolute values of the quotient Q as well as of the capacitance value of the measuring capacitor (C.sub.M) is compared with each other; in the case of a significant deviation from an expected behavior, the evaluation unit is temporarily switched into a safety mode and meanwhile the gradient of the temperature element is detected and evaluated; in the case of a significant increase of the gradient of the temperature element, a temperature compensation is initiated; or in the case of an unchanged gradient of the temperature element, an error signal is generated.

A device and a method evaluate signals from one or more Wheatstone bridges. The requirements of ISO 26262 are taken into account by mixing a test signal with the measurement signal before amplification and before analog-to-digital conversion. After amplification and analog-to-digital conversion, the measurement signal and the test signal are unmixed again. If the test signal does not meet the expectation, the amplifier and/or the analog-to-digital converter is determined to be faulty.

A pressure sensor module includes a pressure sensor configured to periodically measure an internal air pressure within an enclosure and generate a sensor signal having plurality of sensor values; a signal processing chain for conditioning the sensor signal to generate a plurality of conditioned sensor values; a memory configured to store each of the plurality of conditioned sensor values; and a processing circuit coupled to the pressure sensor via the signal processing chain for receiving a current conditioned sensor value and coupled to the memory for receiving a previous conditioned sensor value. The processing circuit is configured monitor for a fault, including calculating a delta pressure value between the current and previous conditioned sensor values, comparing the delta pressure value to a pressure threshold value, and triggering a diagnostic of the signal processing chain if the delta pressure value is greater than the pressure threshold value.

A reset pressure method includes sending a first signal to a complex programmable logic device (CPLD) by a BMC; sending a second signal to the BMC to reset the BMC by the CPLD when the CPLD receives the first signal; the CPLD detecting whether a third signal appears in the BMC when the BMC is reset. When the CPLD detects the third signal appearing in the BMC, the BMC is determined to have completed the reset and is operating normally. When the CPLD does not detect the third signal in the BMC, the reset pressure testing of the BMC is determined as interrupted. A reset pressure system and a non-transitory storage medium are also disclosed.

A diagnostic method for verifying the proper functioning of a fluid flow control device of a fluid system, the method including determining whether at least one pressure sensor is functional and if the at least one pressure sensor is considered functional, determining whether a bypass valve is functional and if the bypass valve is considered functional, determining whether at least one flow sensor is functional, if the at least one flow sensor is considered dysfunctional, a flow sensor fault is raised; and otherwise if the at least one pressure sensor is considered dysfunctional, using the at least one flow sensor to determine whether the bypass valve is functional, if the bypass valve is considered functional, determining whether at least one pump is functional, a pump alert is raised if the at least one pump is considered dysfunctional.

A testbench system is disclosed. The system includes a network interface; a memory storage; a transducer; and one or more processors. The one or more processors are configured to operate in a first phase and: perform calibration of the transducer and generate calibration data; generate a unique identification (CTS-ID) for the transducer based on the calibration data; mark the transducer with the CTS-ID; and provide the CTS-ID and the calibration data to the network interface for transmission to a database.