Conductivity Rod Level Indicator for Grease-Resistant Wastewater Measurement
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Solution Overview
Problem
Current waste water level measurement systems in pump stations face issues with false readings due to grease and other contaminants building up on float switches and conductivity rods, leading to short cycling, mechanical damage, and inadequate level detection in high water conditions, particularly in systems with variable speed drives that require analog readings.
Innovation Solution
A liquid level indication system using a rod with non-conductive material and multiple electrical contacts that measures current flow and resistance to provide an analog signal, detecting contaminants and accurately determining water levels, and alerting operators to potential issues before they cause damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If float switches are used to measure waste water level, then the system is simple and reliable, but grease buildup on floats causes false readings and mechanical damage
Solution Approach 1:
The patent replaces mechanical float switches with an electrical conductivity-based measurement system. A conductivity rod with multiple contacts measures water level through electrical conductivity changes, eliminating mechanical components that are susceptible to grease buildup. The system applies voltage to contacts and measures current flow to ground through the water, providing reliable level detection without mechanical parts.
Solution Approach 2:
The patent introduces an intermediary measurement approach by using electrical conductivity as a mediator between the water and the measurement system. Instead of direct mechanical contact with floats, the system uses the water's electrical conductivity properties to indirectly determine water level, with waste materials serving as the intermediary that affects conductivity rather than mechanically blocking movement.
2Measurement precision
If conductivity rods with metal contacts are used to measure water level, then continuous analog readings are obtained, but waste materials form bridges between contacts causing false high level readings
Solution Approach 1:
The patent segments the measurement system into multiple discrete contacts along the conductivity rod, each capable of independent measurement. By applying voltage to individual contacts and measuring current to ground, the system can determine which contacts are submerged. This segmentation allows the system to identify false readings caused by waste material bridges, as the pattern of conductive contacts will not match the actual water level pattern.
Solution Approach 2:
The patent implements feedback by continuously monitoring the conductivity pattern across multiple contacts and comparing it against expected patterns. When waste materials form bridges between contacts, the measured conductivity pattern deviates from what would be expected based on water level alone. The system uses this feedback to detect and correct for false readings, maintaining measurement accuracy despite the presence of conductive waste materials.
3Productivity
If multiple pump stations are used to transport waste water, then adequate transport capacity is achieved, but coordination between stations becomes complex and overflow risk increases
Solution Approach 1:
The patent creates a universal communication protocol that can be implemented across multiple pump stations with similar functionality. Each station uses the same conductivity measurement system and communication interface, allowing them to exchange information about water levels and operational status. This universality simplifies coordination between stations, as they all speak the same technical language and can be managed from a central location without requiring complex station-specific coordination mechanisms.
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 system effectively reduces false readings, prevents mechanical damage, and provides continuous, accurate water level measurements, enabling timely intervention and efficient operation of waste water pumps.
Implementation Method 1
the level indicator transmitter functioning to measure current flow from each of the plurality of contacts to a ground in the liquid so as to determine which of said plurality of electrical contacts lie beneath a surface of the liquid
Data Source
AI summary
Disclosed is a liquid level indicator suitable for use with an electrical power source comprises: a liquid level indication rod at least partially immersed in the liquid, the liquid level indication rod including a plurality of electrical contacts disposed on a surface of a non-conductive material; a level indicator transmitter in electrical communication with the liquid level indication rod and with the electrical power source, the level indicator transmitter functioning to measure current flow from each of the plurality of contacts to a ground in the liquid so as to determine which of said plurality of electrical contacts lie beneath a surface of the liquid.