A package structure for a differential pressure sensor, and an electronic device are provided. The package structure includes: a substrate and a housing, an edge of the housing is fixed to a front side of the substrate and defines a first chamber with the substrate; and a pressure sensing element fixed to the front side of the substrate and disposed in the first chamber, the pressure sensing element is provided with a second chamber and a pressure sensing layer, the pressure sensing layer being disposed between the first chamber and the second chamber. The first chamber is connected with the outside via a first through hole, and the second chamber is connected with the outside via a second through hole.

A package structure for a differential pressure sensor, and an electronic device are provided. The package structure includes: a substrate and a housing, an edge of the housing is fixed to a front side of the substrate and defines a first chamber with the substrate; and a pressure sensing element fixed to the front side of the substrate and disposed in the first chamber, the pressure sensing element is provided with a second chamber and a pressure sensing layer, the pressure sensing layer being disposed between the first chamber and the second chamber. The first chamber is connected with the outside via a first through hole, and the second chamber is connected with the outside via a second through hole.

A differential pressure indicator includes a multi-polar driving magnets train clamped on a piston pin that moves in response to the changes in pressure conditions, thereby driving a multi-polar follower magnet carrying an indicating member, to move across a scale for a total angular range of 90° to 270°. The exact angular displacement of the follower magnet per unit linear displacement of the driving magnets train is decided by varying the relative magnetic strengths of the driving and follower magnets or by varying the spacing between adjacent magnets of the driving magnetic train. Further, magnetic flux of an auxiliary magnet fitted on the piston pin at a 90° orientation relative to the driving magnet train is utilized for actuating a magnetic switch in the switch assembly.

A flow field measurement device and a method for a scale model of a natural gas hydrate reservoir are provided. The measurement device includes non-central vertical well pressure sensors, non-central vertical well outlet valves, communicating vessel valves, differential pressure sensors, a communicating vessel, a central vertical well outlet valve, and a central vertical well pressure sensor. By providing differential pressure sensors, between a measuring point of the central vertical well and a measuring point of each of the non-central vertical wells, to measure pressure differences, the flow field measurement device enables a reasonable distribution of a three-dimensional space inside the reactor to analyze gas-liquid flow trends in the reactor with a simulated flow field. Determining whether to turn on the differential pressure sensors according to a predetermination based on a feedback from the pressure sensors, allows flow field measurements in the reactor under both high and low pressure differences.

A flow field measurement device and a method for a scale model of a natural gas hydrate reservoir are provided. The measurement device includes non-central vertical well pressure sensors, non-central vertical well outlet valves, communicating vessel valves, differential pressure sensors, a communicating vessel, a central vertical well outlet valve, and a central vertical well pressure sensor. By providing differential pressure sensors, between a measuring point of the central vertical well and a measuring point of each of the non-central vertical wells, to measure pressure differences, the flow field measurement device enables a reasonable distribution of a three-dimensional space inside the reactor to analyze gas-liquid flow trends in the reactor with a simulated flow field. Determining whether to turn on the differential pressure sensors according to a predetermination based on a feedback from the pressure sensors, allows flow field measurements in the reactor under both high and low pressure differences.

An apparatus for indicating the presence of a threshold directional differential pressure between separated adjacent spaces includes a first conduit and an inclined second conduit containing at least one movable element that indicates a threshold pressure difference between the two spaces. The apparatus may provide a compact arrangement while allowing the movable element to have a suitable travel path length within the second conduit. The travel path may include a first stop and a second stop. An imaginary axis or plane passing through a center of a first conduit may intersect the travel path between the first stop and the second stop.

An ultraviolet air sanitizer apparatus for HVAC systems has a frame defining a flow passage therethrough configured such that the frame rear is insertable into a return air inlet of the HVAC system. A sanitizer light is disposed within the flow passage. When activated, the sanitizer light emits germicidal ultraviolet light into the surrounding flow passage. A light baffle is disposed within the flow passage upstream of the sanitizer light and allows air flow but blocks light. An air pressure sensing switch is electrically connected to the sanitizing light and configured to measure air pressure differential across an air filter. When the air pressure differential is a predetermined value or greater, which is indicative of air circulation by the HVAC system, the switch turns on the sanitizer light. When the pressure differential is less than the predetermined value, the switch turns off the sanitizer light.

An ultraviolet air sanitizer apparatus for HVAC systems has a frame defining a flow passage therethrough configured such that the frame rear is insertable into a return air inlet of the HVAC system. A sanitizer light is disposed within the flow passage. When activated, the sanitizer light emits germicidal ultraviolet light into the surrounding flow passage. A light baffle is disposed within the flow passage upstream of the sanitizer light and allows air flow but blocks light. An air pressure sensing switch is electrically connected to the sanitizing light and configured to measure air pressure differential across an air filter. When the air pressure differential is a predetermined value or greater, which is indicative of air circulation by the HVAC system, the switch turns on the sanitizer light. When the pressure differential is less than the predetermined value, the switch turns off the sanitizer light.

A sensor device for measuring properties and/or conditions of one or more fluid substances contained, or streamed, inside a fluid vessel, is disclosed. The sensor device generally comprises a main body portion an attachment portion. The main body portion comprises a cavity and at least one sensing element operatively mounted inside the cavity for measuring the properties and/or conditions of the one or more fluid substances and generating data/signals indicative thereof. The attachment portion comprises at least one fluid passage and it is configured to establish fluid communication between a cavity or lumen of the fluid vessel and the cavity of the main body portion through the at least one fluid passage, to thereby enable the one or more fluid substances to interact with the at least one sensing element upon attachment of said sensor device to the fluid vessel.

A pressure gauge includes: an outer container defining an outer chamber set to a reference pressure (Pr); an inner container disposed in the outer container; and a tube setting the inside of a first inner chamber of the inner container to a measurement pressure (Px). The inner container includes: a cylindrical rigid wall portion; first and second pressure receiving plates that displace due to a differential pressure between the reference pressure and the measurement pressure; a bellows partitioning the inner container into the first inner chamber and a second inner chamber; and a pressure detection element disposed in the second inner chamber and detecting the measurement pressure based on the displacements of the first and the second pressure receiving plates. The outer chamber and the second inner chamber are set to the reference pressure of a high vacuum that is lower than a lower limit of the measurement pressure.