Liquid Level Transducer Isolated Sensor Housing
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Solution Overview
Problem
Reed switch-type liquid level transducers suffer from hysteresis effects, premature switching, and corrosion issues due to exposure to corrosive liquids, making them unreliable and difficult to assemble with numerous components.
Innovation Solution
A liquid level transducer design featuring a mounting head and housing section that are integrally molded as a unitary structure, isolating sensor elements from the liquid, with a snap-fit cap to enclose the interior and prevent liquid exposure, and a sensor assembly with a float rod and actuator for pivoting movement to indicate liquid level changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reed switches are exposed to the liquid being measured, then the transducer can detect liquid level changes, but the reed switches suffer from corrosion and premature failure
Solution Approach 1:
The transducer is divided into separate functional sections: a sealed mounting head containing the reed switches and electronics, and a separate float assembly that contacts the liquid. This segmentation isolates the sensitive components from corrosive exposure while maintaining liquid level detection capability.
Solution Approach 2:
A magnetic field acts as an intermediary between the float (which contacts liquid) and the reed switches (which remain sealed). The float contains a magnet that triggers the reed switches through the sealed wall, allowing indirect interaction without direct liquid exposure.
2Adaptability or versatility
If multiple individual components and fastening means are used in the transducer assembly, then the transducer can be constructed with modular components, but the assembly process becomes difficult and time-consuming
Solution Approach 1:
The mounting head integrates multiple functions into a single sealed housing: it contains the reed switches, electronic circuit board, magnet, and sealing mechanisms. This consolidation reduces the number of separate fastening operations and assembly steps while maintaining modular replaceability of the entire head unit.
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 enhances measurement reliability, extends the transducer's lifespan by protecting sensor components from corrosion, and simplifies assembly by reducing the number of parts and exposure to corrosive liquids.
Implementation Method 1
a float that moves in response to a change in liquid level
Implementation Method 2
The reed switches are normally responsive to the presence and absence of a magnetic field for opening and/or closing the switch
Implementation Method 3
it is known that reed switches suffer from hysteresis effects
Data Source
AI summary
A transducer for determining the level of liquid within a container includes a mounting head adapted for connection to the container and a sensor assembly adapted to extend into the container from the mounting head. The sensor assembly includes a housing having an upper portion connected to the mounting head and a lower portion that extends from the upper portion. The lower portion has a hollow interior that is isolated from liquid within the container. A plurality of sensor elements are located within the hollow interior. A float rod is pivotally connected to the housing and a float is connected to a distal end of the float rod to thereby cause pivoting movement of the float rod in response to a change in liquid level within the container. An actuator is located outside of the housing and is operatively associated with the float rod for pivotal movement therewith. The actuator is operative to change an electrical state of at least one of the sensor elements to thereby indicate a level condition of the liquid within the container.