Pressure Sensor Media Isolation Layer Design
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Solution Overview
Problem
Existing pressure sensor assemblies face challenges in effectively isolating media from the sensor element while maintaining structural integrity and accuracy under varying pressure conditions, often resulting in reduced precision and increased size due to direct media contact or inadequate sealing.
Innovation Solution
A pressure sensor assembly design featuring a sensor unit with a printed circuit board, a pressure sensor secured to one side of the PCB, a media isolation layer, and a support structure that encases the sensor, providing a fluid path and seal between the pressure port and the media isolation layer, which transfers pressure while preventing direct media contact and enhancing structural support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If direct media contact with pressure sensor is used, then device complexity is reduced, but measurement precision deteriorates due to stress and contamination
Solution Approach 1:
A media isolation layer is introduced as an intermediary between the pressure media and the sensor element. This layer allows pressure transmission while preventing direct contact, thus maintaining measurement precision without requiring complex protective structures. The isolation layer acts as a mediator that transfers the essential mechanical parameter (pressure) while blocking harmful direct interaction.
Solution Approach 2:
The media isolation layer is implemented as a thin film or gel structure that is flexible enough to transmit pressure changes while providing isolation. This thin film approach maintains structural simplicity while enabling precise pressure sensing by allowing mechanical deformation under pressure without exposing the sensor to direct media contact.
2Ease of manufacture
If inadequate sealing is used, then ease of manufacture is improved, but reliability deteriorates due to media leakage and contamination
Solution Approach 1:
The support structure is designed with a nested configuration where the media isolation layer is positioned within a defined chamber or recess. This nesting arrangement provides inherent sealing by containing the isolation layer within the support structure, preventing media leakage while maintaining a relatively simple manufacturing process through integrated molding or machining of the nested features.
3Measurement precision
If media isolation layer is added, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The media isolation layer and support structure are merged into an integrated component assembly. The support structure incorporates features that directly hold and position the isolation layer, eliminating the need for separate mounting hardware or complex assembly steps. This merging reduces overall device complexity while maintaining the precision benefits of media isolation.
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
This design enhances the accuracy and robustness of pressure sensing by reducing stress on the sensor and maintaining precision under high pressures, while also allowing for a more compact sensor unit configuration with minimal surface area exposure.
Implementation Method 1
the media isolation layer transfers a pressure provided by the media in the pressure port to the pressure sensor
Implementation Method 2
The support may be a gel ring
Data Source
Figure 1
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AI summary
A pressure sensor assembly having a sensor unit, a pressure port, and an electrical connector. The sensor unit may include a printed circuit board (PCB), a pressure sensor, a support, and a media isolation layer. The PCB may have a first side and an opposite second side, where the pressure sensor may be secured to the first side. The support may also be secured to the first side of the PCB and may circumferentially surround the pressure sensor and/or may define a media sensing opening. The media isolation layer (e.g., a gel or other material) may be provided in the media sensing opening and encase the pressure sensor, where the media isolation layer may transfer a pressure provided by the media in the pressure port to the pressure sensor and may act as a barrier between the media and the pressure sensor.