Inductive Conductivity Sensor Bracket Design for Coil-Safe Temperature Sensing
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Solution Overview
Problem
Existing inductive conductivity sensors face challenges in accurately measuring conductivity while simultaneously accounting for temperature variations, particularly in harsh industrial environments, due to the interference of electromagnetic fields and the need for precise temperature measurement at the same location.
Innovation Solution
The inductive conductivity sensor design incorporates a temperature sensor on a bracket between two coils, enclosed in a thin, fluid-tight housing, ensuring optimal temperature exposure and minimal electromagnetic interference, with a manufacturing method involving injection molding and ultrasonic welding for enhanced stability and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the temperature sensor is placed inside the housing close to the coils, then temperature measurement precision is improved, but electromagnetic interference increases
Solution Approach 1:
The temperature sensor is extracted from the interior of the housing and positioned on the outer surface, removing it from the electromagnetic field environment while maintaining thermal contact with the measured medium through the thin housing wall
Solution Approach 2:
The housing wall acts as an intermediary structure that provides thermal conduction path from the measured medium to the temperature sensor while blocking electromagnetic interference from reaching the sensor
2Measurement precision
If the housing thickness is reduced to improve temperature sensitivity, then temperature measurement sensitivity is improved, but mechanical strength decreases
Solution Approach 1:
The housing is designed as a thin-walled structure optimized for thermal conduction, using material and geometric properties to achieve sufficient mechanical strength despite reduced thickness, thereby maximizing temperature sensitivity
3Measurement precision
If the temperature sensor is exposed to the fluid for optimal temperature measurement, then temperature sensitivity is improved, but electromagnetic interference from the fluid environment increases
Solution Approach 1:
The temperature sensor is extracted from the direct fluid environment and positioned on the outer housing surface, eliminating exposure to electromagnetic interference from the fluid while maintaining thermal measurement capability through the housing wall
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 sensor achieves precise conductivity and temperature measurements with robustness against mechanical and chemical influences, maintaining sensitivity and stability through a symmetrical arrangement and minimal housing thickness.
Implementation Method 1
When the transmitter coil is excited with an alternating voltage signal, it generates a magnetic field that induces a current in the closed medium path involving the coils... Since this alternating electrical current in the medium in turn generates a varying magnetic field that surrounds it, an alternating current is induced in the receiver coil
Implementation Method 2
the temperature sensor is arranged on the bracket... allows for its temperature sensor to be optimally exposed to the fluid to be measured, which leads to optimal temperature sensitivity
Data Source
AI summary
An inductive conductivity sensor comprises an electronics unit including a printed circuit board, a transmitter coil, a receiver coil, and a temperature sensor. A first through-hole is arranged between a first axial end and a second axial end of the printed circuit board, and a second through-hole is arranged between the first axial end and the first through-hole, so that a bracket is formed between the first axial end and the second through-hole. A temperature sensor is arranged on the bracket. The transmitter coil and receiver coil are arranged on opposite sides of the printed circuit board around the first through-hole. A housing encloses the electronics unit in a fluid-tight manner so that the first through-hole and the second through-hole each allow at least partial passage of a fluid therethrough.