Media-Isolated Gauge Pressure Sensor With Reference Pressure Venting
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Solution Overview
Problem
Pressure sensors that do not consider reference pressure and are not media-isolated are prone to inaccuracies due to direct contact with the measured medium, which can lead to damage from moisture and contaminants.
Innovation Solution
A media-isolated relative gauge pressure sensor design that includes a tubular connector with a cavity for reference pressure, an O-ring to prevent contamination, and a diaphragm with incompressible fluid to isolate the sensing element, allowing accurate pressure measurement by calculating net pressure based on reference and medium pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensing element is directly exposed to the measured medium, then the pressure measurement is direct and simple, but the sensing element is damaged by moisture and contaminants
Solution Approach 1:
The patent introduces a diaphragm as an intermediary component between the measured medium and the sensing element. The diaphragm transmits pressure from the medium to the sensing element while preventing direct contact, thus protecting the sensing element from moisture and contaminants while maintaining measurement capability
Solution Approach 2:
The sensor is divided into separate functional components: a base port for medium entry, a diaphragm for pressure transmission, an incompressible fluid for force transmission, and a sensing element for measurement. This segmentation allows each component to perform its specific function while protecting the sensing element from direct exposure to the medium
2Measurement precision
If reference pressure is not considered, then the measurement system is simpler, but pressure measurement accuracy deteriorates
Solution Approach 1:
The patent uses an incompressible fluid as an intermediary to transmit pressure forces from the diaphragm to the sensing element. This fluid medium enables accurate transmission of pressure differential (including reference pressure effects) without direct mechanical contact, improving measurement precision while isolating the sensing element
Solution Approach 2:
The patent employs hydraulic principles by using an incompressible fluid to transmit pressure forces. The fluid transmits the pressure differential between the measured medium and reference pressure to the sensing element, enabling accurate relative gauge pressure measurement through fluid-mediated force transmission
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design protects the sensing element from the measured medium, ensuring accurate pressure readings by isolating it from contaminants and maintaining sensor integrity.
Implementation Method 1
the incompressible fluid dispensed between the TO header element and the diaphragm... the incompressible fluid is configured to impart the pressure to a sensing side of the sensing element
Implementation Method 2
Some pressure sensors, in some examples, comprise a piezoresistive sensing element which is configured to convert a pressure exerted by a medium to be measured into a change in resistance
Implementation Method 3
the tubular connector comprises an O-ring surrounding an outer circumference of the metal tube
Implementation Method 4
an assembly welded to the base port
Data Source
AI summary
Apparatuses, systems, and methods are provided for media-isolated relative gauge pressure sensors. In some embodiments, an apparatus comprises a base port, an assembly, and a tubular connector. The tubular connector may comprise a cavity for allowing air at a reference pressure to enter internal portions of the tubular connector and the assembly such that the cavity is configured to facilitate flow of the air at the reference pressure to a back side of a sensing element, wherein the back side of the sensing element is opposite to a sensing side of the sensing element that is configured to receive pressure, via an incompressible fluid, from a medium being measured. The tubular connector may be mechanically coupled to a metal tube inserted in at least a portion of the cavity. The tubular connector may comprise an O-ring surrounding an outer circumference of the metal tube.