Capacitance Sensor for Sink Drain FOG Detection
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Solution Overview
Problem
Residential kitchen sinks contribute significantly to clogging of municipal sewer systems due to the disposal of excessive Fats, Oils, and Grease (FOG) down drains, necessitating a reliable method to detect and monitor FOG levels in effluent flows.
Innovation Solution
A capacitance-based sensing system comprising electrodes connected to a capacitance meter within a pipe portion of a sink drain, allowing for the detection of changes in FOG content by measuring changes in capacitance, which triggers a reporting system to alert when excessive FOG is present, and can integrate with a monitoring system to close the drain line or initiate grease trap cleaning when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional sewer systems are used without FOG monitoring, then infrastructure simplicity is maintained, but sewer clogging and system failures occur due to excessive FOG accumulation
Solution Approach 1:
The patent replaces complex mechanical FOG detection methods with a capacitance-based electrical sensing system. The capacitance sensor detects FOG levels by measuring changes in dielectric constant of the fluid, eliminating the need for mechanical moving parts while achieving reliable FOG monitoring in sewer systems
Solution Approach 2:
The monitoring system automatically detects FOG accumulation and triggers alerts without requiring manual inspection. The capacitance sensor continuously monitors effluent composition and self-regulates the monitoring process, reducing the need for human intervention while maintaining system reliability
2Measurement precision
If capacitance sensing is used to detect FOG levels, then FOG detection precision is improved, but device complexity increases due to electrode and electronics requirements
Solution Approach 1:
The capacitance sensor assembly serves multiple functions: it detects FOG levels, determines effluent composition, and provides data for control decisions. By making the sensor multi-functional, the patent reduces the need for separate detection devices while maintaining high measurement precision
Solution Approach 2:
The system detects FOG levels by measuring changes in capacitance, which changes in response to the dielectric properties of the effluent. This parameter-based detection method provides precise FOG level measurement while using simple electrical components rather than complex mechanical or optical systems
3Loss of time
If real-time FOG monitoring is implemented, then response time to FOG events is reduced, but energy consumption and system complexity increase
Solution Approach 1:
The monitoring system uses periodic capacitance measurements rather than continuous monitoring. The controller periodically reads the capacitance sensor and compares readings to detect FOG events, reducing energy consumption while maintaining timely response capability through strategic sampling intervals
Solution Approach 2:
The system implements feedback by comparing capacitance readings against reference values and triggering alerts only when FOG thresholds are exceeded. This feedback mechanism allows the system to respond quickly to actual FOG events while consuming minimal energy during normal operation by avoiding unnecessary continuous activation
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
Effectively monitors and reports FOG levels, preventing sewer clogs by identifying high FOG flows and enabling timely intervention, such as educating users and maintaining proper drainage habits, thereby reducing FOG accumulation in sewer systems.
Implementation Method 1
a first electrode within the pipe portion, a second electrode outside the pipe portion, and conductors connecting the first and second electrodes to a capacitance meter. Changes in capacitance between the electrodes caused by changes in proportions of FOG content in effluent from the sink can be detected
Implementation Method 2
sensing the capacitance of the effluent flowing downward from the sink through the pipe portion to determine capacitance of low-FOG effluent; sensing the capacitance of the effluent flowing downward from the sink through the pipe portion to determine capacitance of high-FOG effluent
Data Source
AI summary
An apparatus senses the proportion of FOG flowing with effluent from a sink to a p-trap. A pipe portion is connectable for use as a tailpipe for a sink with a first electrode within the pipe portion and a second electrode outside the pipe portion. Conductors connect the first and second electrodes to a capacitance sensor, so changes in capacitance between the electrodes caused by changes in proportions of FOG content in effluent from the sink can be detected and/or monitored. The monitoring can be remote and can cause an action when an excess FOG content is detected.