The technology relates to techniques for lighter than air vehicle redundant pressure sensor calibration. A lighter than air (LTA) vehicle can include a redundant pressure sensor calibration system, including a high precision pressure sensor onboard the LTA vehicle and two or more additional pressure sensors onboard the LTA vehicle, where the two or more additional pressure sensors are each redundant with the high precision pressure sensor. The two or more additional pressure sensors can be calibrated based on pressure measurements from the high precision pressure sensor and the two or more additional pressure sensors at two or more altitudes, wherein the high precision pressure sensor is calibrated before a flight of the LTA vehicle.

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.

A pressure measurement device is configured to adjust a gas pressure in an external gas cavity that is fluidly coupled thereto and measure the adjusted gas pressure in the external gas cavity. The pressure measurement device includes a port, a pressure control module, a port pressure sensor, and a gas discharging port. The pressure measurement device is fluidly coupled to the external gas cavity through the port. The pressure control module is coupled to the port through a gas passage and configured to operably provide pressurized gas to the external gas cavity or draw gas from the external gas cavity. The port pressure sensor is coupled to the port and configured to measure a gas pressure at the port. The gas discharging port is coupled to the port and the pressure control module, and configured to operably discharge gas from the port or the pressure control module to an external environment.

A method that configures a liquid-level transmitter device to generate a measured value for a level of a liquid. The method includes steps to correct for changes in physical properties of one or more components of the device. In one embodiment, the method utilizes a correction value that incorporates data from a temperature sensor disposed inside of the device, for example, inside of the electronics member.

Determining calibration values for atmospheric sensors that provide measured pressures used for estimating altitudes of mobile devices. Particular systems and methods determine if any uncalibrated reference-level pressure estimates associated with an unstable pressure sensor should not be used when calibrating the unstable pressure sensor, and calibrate the unstable pressure sensor using all of the uncalibrated reference-level pressure estimates except any uncalibrated reference-level pressure estimate that should not be used when calibrating the unstable pressure sensor.

A differential pressure monitor is disclosed herein, which comprises a controller comprising a processor disposed in a housing, and a memory storing instructions that, when executed by the processor, cause the processor to pre-calibrate a first pressure sensor and a second pressure sensor before initial use, and subsequently, determine the differential pressure between the first and second sensors during use of the sensors, and display an indicia representative of the differential pressure between the first and second sensors. Corresponding methods and systems also are disclosed.

Determining when to calibrate a pressure sensor of a mobile device. Particular systems and methods determine values of a plurality of metrics, determine weights for the metric values, determine weighted metric values by applying the weights to the metric values, use the weighted metric values to determine if a pressure sensor of the mobile device should be calibrated using information associated with the first location, and calibrate the pressure sensor of the mobile device using the information associated with the first location if a determination is made that the pressure sensor of the mobile device should be calibrated using information associated with the first location.

The invention relates to equipment, devices and methods for testing a calibrated leak or passage of pressurized gas from a tire. In one example, a test plug including a calibrated cross section orifice and a predetermined gas flow rate is connected to a tire. The test plug applies a pressure opening the tire valve member to release gas from the tire through the test plug. In one example, a TPMS sensor and a TPMS measurement tool are used to measure the decrease of air pressure in the tire through the test plug and determine if the TPMS sensor is operating properly. In one example, a plurality of test plugs with different gas flow rates are provided. A method for testing the calibrated leak using the test plug is further disclosed.

An airflow sensor assembly for an air duct is provided. The airflow sensor assembly includes the air duct having an interior wall and an exterior wall, a high pressure pickup device, a low pressure pickup device, a pressure redirection device, and a pressure sensor. The pressure redirection device is fluidly coupled to the high pressure pickup device and the low pressure pickup device and includes a low inlet, a high inlet, and a common outlet. The pressure sensor is selectively fluidly coupled to the high pressure pickup device and the low pressure pickup device and includes a first inlet and a second inlet. The second inlet is fluidly coupled to the common outlet of the pressure redirection device.

An apparatus for calibrating a pressure sensing device having a pressure sensor and a temperature compensation device includes: a chamber for applying a variable temperature and a variable pressure to the pressure sensing device; a temperature regulation device for regulating the temperature in the chamber designed such that the temperature in the chamber respectively increases in a strictly monotonous manner or falls in a strictly monotonous manner during one or more time intervals; a pressure regulation device for regulating the pressure in the chamber designed such that the pressure in the chamber respectively monotonously increases or respectively monotonously falls in at least one of the time intervals during a plurality of sub-intervals of the one-time interval; a reference pressure sensor for sensing the pressure in the chamber during the time interval(s); and a data record generation device for generating corresponding data records.