A load lock pressure gauge comprises a housing configured to be coupled to a load lock vacuum chamber. The housing supports an absolute vacuum pressure sensor that provides instantaneous high vacuum pressure signal over a range of high vacuum pressures and a differential diaphragm pressure sensor that provides an instantaneous differential pressure signal between load lock pressure and ambient pressure. The housing further supports an absolute ambient pressure sensor. A low vacuum absolute pressure is computed from the instantaneous differential pressure signal and the instantaneous ambient pressure signal. A controller in the housing is able to recalibrate the differential diaphragm pressure sensor based on measured voltages of the sensor and a measured ambient pressure during normal operation of the pressure gauge with routine cycling of pressure in the load lock.

A method involves determining weighted metric values for each metric of a plurality of metrics by applying a weight for each metric to a determined value of each metric. The method further involves using the weighted metric values to determine if a pressure sensor of a mobile device should be calibrated using information associated with the first location, and if a determination is made that the pressure sensor of the mobile device should be calibrated using information associated with the first location, then using the information associated with the first location to calibrate the pressure sensor of the mobile device.

A pressure measuring device configured as a multi-function device operable as a differential pressure switch (DPS), a differential pressure transducer (DPT), a pressure switch (PS), a pressure transducer (PT) providing readings of high and low pressure zones, a data recording logger, and a backwashing controller. The pressure measuring device may use at least two piezoelectric sensors operable to measure pressure attributes. The associated electronic hardware, processing unit, cables and pressure tubing are retrofittable and packaged in a molded case, with no moving parts with the electronic hardware fully coated to make the device reliable and resistant to extreme environmental conditions. The device is configured for remote access, enabling remote device configuration, maintenance and servicing. The device is further operable to communicate with various external devices: a tablet, a smartphone and the like as a user interface and further provides wired interface with a programmable logic controller (PLC) via RS-485 interface.

A test unit for measuring internal pressure in a cylindrical glass container includes a support adapted for housing the cylindrical glass container during a test phase, defining a longitudinal axis; a piston for selectively exerting a predetermined axial force in a longitudinal direction substantially parallel to the longitudinal axis and for actuating a plunger movable along the longitudinal axis; at least one measuring sensor for measuring a change in diameter in a transverse direction to the longitudinal axis; a programmable control unit operatively connected to the measuring sensor and configured to correlate a diameter change measured by the measuring sensor in the presence of a predetermined axial force with reference internal pressure values to which the measured diameter change and the predetermined axial force correspond. Associated processes for measuring internal pressure in a cylindrical glass container are further disclosed.

A device for use in pressure sensing has a housing enclosing a chamber and having at least one port that communicates with the chamber. A pressure sensor receives fluid pressure from the chamber. The chamber has a compliance that exhibits a marked change in volumetric stiffness repeatably at a fixed pressure.

A device for use in pressure sensing such as hydrocephalus shunts, having a housing enclosing a chamber with at least one port communicating with the chamber. A wall of the chamber includes a flexible portion or thin diaphragm that deflects with transitions in pressure to contact an upstand structure of the housing. A pressure sensor is contained within an enclosure sealed from the chamber by a flexible membrane and which receives fluid pressure from the chamber. This arrangement allows for calibration of the device by identifying a knee feature in pressure data associated with the diaphragm making contact with the upstand.

In an embodiment a sensor arrangement includes a pressure sensor realized as a capacitive pressure sensor, a capacitance-to-digital converter coupled to the pressure sensor and implemented as a delta-sigma analog-to-digital converter and a reference voltage generator having a control input configured to receive a control signal and an output configured to provide a reference voltage, wherein the output of the reference voltage generator is connected to an input of the capacitance-to-digital converter, wherein the reference voltage generator is configured to set a value of the reference voltage as a function of the control signal, and wherein at least two different values of the reference voltage have the same sign and different amounts.

An apparatus for event detection is provided. The apparatus comprises an error signal determiner for determining an error signal portion depending on a pressure signal. The error signal determiner determines a predicted signal portion depending on a first signal portion of the pressure signal. The error signal determiner also determines the error signal portion depending on the predicted signal portion and depending on a second signal portion of the pressure signal, wherein the second signal portion of the pressure signal succeeds the first signal portion of the pressure signal in time. The apparatus also comprises a classifier for determining, depending on the error signal portion, whether an event of a group of one or more events has occurred or whether no event of the group has occurred.

A pressure calibration system includes a manual pump and pressure adjustment subsystem. The pump outputs pressurized fluid to the adjustment subsystem in response to manual actuation. The adjustment subsystem is configured to automatically adjust the pressure in fine increments after the manual pump pressurizes the fluid within a tolerance range of a pressure set point. A user interface is further configured generate annunciations regarding the fluid pressure.

One or more computing devices, systems, and/or methods for calibrating barometric sensors and/or determining altitudes of devices are provided. In an example, a device is determined to be outdoors. In response to determining that the device is outdoors, a calibration process associated with a barometric sensor of the device is performed. The calibration process includes performing one or more barometric measurements using the barometric sensor to determine one or more barometric pressure measures, determining one or more locations of the device, wherein the one or more locations are associated with the one or more barometric measurements, and determining a barometric offset based upon the one or more barometric pressure measures and one or more reference values. An adjusted barometric pressure and/or an altitude of the device is determined based upon a first barometric pressure measure and the barometric offset.