Pressure Transmitter Sensor Mount Electrical Isolation
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Solution Overview
Problem
Existing pressure transmitter technologies face difficulties in mounting pressure sensors with electrical isolation from the transmitter body, often relying on expensive and unreliable methods such as metal plating, metal to ceramic joints, and adhesives, which can result in manufacturing failures and reduced reliability.
Innovation Solution
A pressure sensor mount using a non-conductive spacer and glass-to-metal seals, along with soldering or welding techniques, provides electrical isolation between the pressure sensor and the transmitter body, employing established materials and processes for improved reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical isolation methods such as metal plating, metal to ceramic joints, and adhesives are used to mount the pressure sensor, then electrical isolation from the transmitter body is achieved, but manufacturing reliability deteriorates and manufacturing complexity increases
Solution Approach 1:
The patent introduces a non-conductive spacer as an intermediary component between the pressure sensor and the transmitter body. This spacer provides the necessary electrical isolation without requiring complex metal plating, ceramic joints, or adhesive bonding processes. The spacer acts as a mediator that achieves electrical isolation through its inherent non-conductive material properties, significantly simplifying the manufacturing process and improving reliability.
2Ease of manufacture
If non-conductive spacer is used to electrically isolate the conduit from the metal body, then electrical isolation reliability improves and manufacturing ease improves, but device complexity increases due to additional components
Solution Approach 1:
The non-conductive spacer is designed to perform multiple functions simultaneously: it provides electrical isolation between the conduit and metal body, maintains precise positioning of the pressure sensor, and supports the structural integrity of the mounting assembly. By integrating these multiple functions into a single component, the patent reduces device complexity compared to using separate components for each function.
3Reliability
If glass-to-metal seals are used to couple the conduit to the metal body, then sealing reliability improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes the specific material parameters of glass and metal, particularly their thermal expansion coefficients and softening temperatures, to create reliable seals. The glass-to-metal seal process involves controlled heating to specific temperature ranges where the glass becomes sufficiently soft to flow and bond with the metal surface, then controlled cooling to lock in the seal. By precisely controlling these thermal parameters, the patent achieves high sealing reliability without requiring extremely tight mechanical tolerances.
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 solution achieves robust and reliable electrical isolation with high-quality glass-to-metal seals, reducing manufacturing issues and enhancing the reliability of pressure sensor mounts in pressure transmitters.
Implementation Method 1
A non-conductive spacer is disposed between the metal body and conduit and is configured to electrically isolate the conduit from the metal body
Implementation Method 2
A pressure sensor mount using a non-conductive spacer and glass-to-metal seals, along with soldering or welding techniques
Data Source
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AI summary
A pressure transmitter (12) with pressure sensor mount includes pressure measurement circuitry (62). A metal body (100) of the pressure transmitter has a pressure coupling configured to couple to a process pressure P. A pressure sensor (40) is configured to provide an output related to an applied pressure to the pressure measurement circuitry. A conduit (120) is coupled to the pressure sensor (40) and configured to apply an applied pressure corresponding to the process pressure to pressure sensor. A non-conductive spacer (110) is configured to electrically isolate the conduit (120) from the metal body (100). The non-conductive spacer (110) has an opening (112) formed therein and is arranged to convey the applied from the metal body (100) to the conduit (120).