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.

A positive airway pressure device is disclosed herein. The positive airway pressure device includes a blower, a buffer chamber, a gas manifold, a first sensor, a second sensor, and a controller. The buffer chamber is downstream of the blower. The buffer chamber configured to receive gas generated by the blower and output the gas to a patient. The gas manifold is fluidly coupling the blower to the buffer chamber. The first sensor is at least partially disposed in the gas manifold. The first sensor is configured to measure a first pressure in the gas manifold. The second sensor is at least partially disposed in the buffer chamber. The second sensor is configured to measure a second sensor in the buffer chamber.

A monitoring system for monitoring a supply voltage for an electronic component is described, comprising a voltage monitoring unit, which is configured to monitor a voltage level assigned to a supply voltage applied to the electronic component, and a switching unit which is configured to switch the electronic component on and/or off. The switching unit is coupled with the voltage monitoring unit. The switching unit is furthermore configured to switch off the electronic component if the voltage monitoring unit determines that the voltage level is below a predetermined threshold value. A mains monitoring circuit is furthermore described.

A monitoring system for monitoring a supply voltage for an electronic component is described, comprising a voltage monitoring unit, which is configured to monitor a voltage level assigned to a supply voltage applied to the electronic component, and a switching unit which is configured to switch the electronic component on and/or off. The switching unit is coupled with the voltage monitoring unit. The switching unit is furthermore configured to switch off the electronic component if the voltage monitoring unit determines that the voltage level is below a predetermined threshold value. A mains monitoring circuit is furthermore described.

A communication device, method and computer program product enable reduced polling of a barometric sensor, which reduces power consumption and sensor calibration drift. A controller of a communication device determines at least one of received signal strength and direction of respective broadcast signals from local network node(s) positioned within a building to provide a local coverage area. The controller determines a location of the communication device in relation to the local network nodes in response to determining the received signal strength and/or the direction of the respective broadcast signals. The controller determines current altitude data related to a current barometer reading of the barometric sensor. The controller compares the current and the historical altitude data associated with past reading(s) at the location. In response to determining that a difference between the historical and the current altitude data is greater than a threshold distance, the controller calibrates the barometric sensor.

Fiber-optic equipment is often deployed in various locations, and performance of fiber-optic transmissions may be monitored as a gauge of equipment status to prevent costly and inconvenient communication outages. Events that damage equipment that eventually result in outage and may be desirable to address proactively, but the occurrence of such events may be difficult to detect only through equipment performance. Presented herein are techniques for monitoring and maintaining fiber-optic equipment performance via enclosure sensors that measure physical properties within a fiber-optic equipment enclosure, such as temperature, pressure, light, motion, vibration, and moisture, which are often diagnostic and predictive of causes of eventual communication outages, such as temperature-induced cable loss (TICL), incomplete flash-testing during installation, exposure to hazardous environmental conditions, and tampering. An enclosure sensor package transmits the physical measurements to a monitoring station, and automatic determination of enclosure-related events may enable triaging and transmission of repair alerts to maintenance personnel.

A method for operating a group of pressure sensors is provided. First and second pressure sensors respectively have first and second pressure measurement ranges, and are arranged to measure the pressure in a common measurement volume, and have measurement ranges that overlap in a range. The method comprises: aa) reading out first and second measurement signals respectively from the first and second pressure sensors substantially simultaneously while the pressure in the common measurement volume is in the overlapping range; bb) stipulating the first measurement signal which has been read out as the adjustment point for the second pressure sensor; cc) determining at least one calibration parameter, in particular a gas-dependent calibration parameter, for the second pressure sensor as a function of the first measurement signal, as a function of the adjustment point for the second pressure sensor, as stipulated in bb), and as a function of the second measurement signal.

A method for recognizing deposits and/or adhesions on the outside of a measurement membrane of a pressure measuring device within a process facility is disclosed. The pressure measuring device includes a pressure measuring cell comprising a measurement membrane to detect pressure of a medium in a container. The outside of the measurement membrane is at least partially in contact with the medium its second side facing away from the medium includes means for detecting deflection of the measurement membrane. The pressure measuring device detects a micropulsation superimposed on the static pressure as an actual value. Micropulsations result from specific operating states of the process facility. Micropulsation conditions typical of specific operating states have been stored beforehand as setpoint values in an equalization procedure. The detected actual values are compared to the specified setpoint values, and an alarm signal is generated if they exceed and/or fall below the specified values.

The present disclosure relates to methods and systems for realization of a reference pressure as well as calibration of devices under test. The techniques leverage the measurement of buoyancy artifacts under vacuum and pressure conditions, and the use of gas law equations and related variables to obtain low uncertainty reference values for pressure among others. The techniques can include measuring an absolute mass difference of buoyancy artifacts under vacuum; measuring effective masses of the buoyancy artifacts under a gas pressure condition, and determining an effective mass difference between the buoyancy artifacts; and determining a low-uncertainty pressure based on the absolute mass difference, effective mass difference, Boltzmann constant, volume difference, molecular weight of the gas at pressure, and temperature of the measurements.

A respiratory apparatus evaluates accuracy of a pressure sensor, such as when only a single pressure sensor is provided. The accuracy of the pressure sensor may be assessed based on pressure measurement obtained from the pressure sensor and a subordinate or secondary characteristic of the respiratory device such as altitude or atmospheric pressure. A controller or processor may calculate the altitude of the respiratory device based in part on the pressure measurement. In some embodiments, the assessment of the pressure sensor may involve an evaluation of the calculated altitude. In some cases, the assessment of the pressure sensor may involve determining an estimated pressure based on a calculated altitude, and comparing the pressure measurement obtained from the pressure sensor with the estimated pressure.