Inline Water Hardness Sensing for Real-Time Detergent Control
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Solution Overview
Problem
Current methods for measuring water hardness, such as colorimetric and fluorescent assays, are labor-intensive, impractical for real-time monitoring in industrial and residential settings, and fail to account for variable hardness levels, leading to inefficient detergent use and suboptimal water softener performance.
Innovation Solution
An inline water hardness sensor with a reversible sensing matrix and light-based detection system that measures calcium and magnesium levels in real-time, integrated into cleaning appliances and water softeners to adjust detergent usage and control regeneration processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If colorimetric and fluorescent assays are used to measure water hardness, then measurement precision is improved, but device complexity and ease of operation deteriorate due to labor-intensive procedures and irreversible reactions requiring sample disposal
Solution Approach 1:
The patent replaces manual mechanical testing procedures with an automated optical sensing system. The sensor uses a light source and photodetector to automatically measure hardness through optical absorption changes, eliminating the need for manual reagent addition, color comparison, and sample disposal operations.
Solution Approach 2:
The sensor system performs self-measurement by automatically detecting optical property changes in the water sample. The sensing element with indicator and selectivity component autonomously responds to calcium and magnesium ions, generating measurable signals without requiring external manual intervention for each measurement cycle.
2Measurement precision
If colorimetric and fluorescent assays are used to measure water hardness, then measurement precision is improved, but productivity deteriorates due to periodic or point measurements rather than real-time monitoring
Solution Approach 1:
The patent enables continuous real-time monitoring of water hardness by maintaining a constant optical measurement process. The light source continuously illuminates the sensing element, and the photodetector continuously detects optical property changes, providing uninterrupted hardness data as water flows through the system.
Solution Approach 2:
The sensor system is pre-configured with the sensing element containing indicator and selectivity components before water flow begins. This preliminary preparation allows immediate measurement upon water contact, eliminating the need for separate sample preparation and enabling real-time monitoring from the start of water flow.
3Ease of operation
If manual detergent adjustment is used based on assumed hardness levels, then ease of operation is maintained, but loss of substance increases due to detergent waste or insufficient cleaning performance
Solution Approach 1:
The patent implements a feedback control system where the sensor continuously measures actual water hardness levels and the controller automatically adjusts detergent dosage accordingly. This closed-loop system uses real-time hardness data to optimize detergent addition, preventing both over-dosing (waste) and under-dosing (insufficient cleaning).
Solution Approach 2:
The system dynamically changes the detergent dosage parameter based on measured hardness levels. The controller modifies the amount of detergent added to the water stream in real-time according to the actual calcium and magnesium concentration, optimizing cleaning efficiency while minimizing chemical consumption.
4Ease of operation
If volume-based regeneration control is used for water softeners, then ease of operation is maintained, but reliability deteriorates due to unaccounted variable hardness levels affecting softener performance
Solution Approach 1:
The patent implements feedback control for water softener regeneration by using the hardness sensor to continuously monitor influent water quality. The controller receives real-time hardness data and adjusts regeneration timing and duration based on actual calcium and magnesium levels, ensuring reliable softener performance regardless of varying water hardness conditions.
Solution Approach 2:
The regeneration control system transitions from static volume-based scheduling to dynamic hardness-based control. The system continuously adapts regeneration parameters according to real-time hardness measurements, optimizing resin utilization and ensuring consistent water softening performance under varying operational conditions.
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
Enables real-time monitoring and adjustment of water hardness, optimizing detergent use and water softener performance by providing accurate and continuous measurements, reducing waste and improving operational efficiency.
Implementation Method 1
a light source configured to direct light through the substrate and the sensing element. The sensor also includes a light detector configured to receive transmitted light from the substrate and the sensing matrix and to generate a signal representative of selective wavelengths of the light indicative of the one or more chemical species in the flow of water
Data Source
AI summary
An appliance using water including an incoming water valve is provided. The appliance includes a sensor disposed in-line to an incoming flow of water received from the incoming water valve and is configured to sense a degree of hardness in the incoming flow of water. The sensor includes a sensing element disposed on a substrate. The sensing element includes a sensing matrix, an indicator for one or more chemical species in flow of water, and a selectivity component that reacts reversibly with one or more chemical species in the water. The sensor also includes a light source configured to direct light through the substrate and the sensing matrix. The sensor further includes a light detector configured to receive transmitted light from the substrate and the sensing matrix and to generate a signal representative of selective wavelengths of the light indicative of one or more chemical species in flow of water.