Gear Flow Meter Capacitive Sensor Air Detection
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Solution Overview
Problem
Positive displacement fluid meters, such as gear flow meters, face challenges in accurately measuring fluid flow due to false indications caused by air flow after the product runs out, leading to inaccurate volume measurements and potential process failures.
Innovation Solution
Incorporating a capacitive sensor system with electrodes and an optical assembly to differentiate between product and air flow, using detectable areas on rotating elements and monitoring capacitance changes to detect out-of-product events, ensuring accurate fluid measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a positive displacement meter uses a rotating element to measure fluid flow, then the meter can measure flow rate, but the rotating element may rotate due to air flow after product runs out, causing false indications
Solution Approach 1:
A capacitive sensor is introduced as an intermediary detection mechanism between the rotating element and the measurement system. The sensor detects changes in capacitance caused by the presence or absence of product (versus air) flowing through the meter, providing a reliable indicator of actual product flow rather than relying solely on rotating element motion. This intermediary detection resolves the false indication problem by distinguishing between product flow and air flow conditions.
Solution Approach 2:
The patent replaces the purely mechanical detection system (relying on rotating element position) with an electrical sensing system. The capacitive sensor converts the physical presence of product or air into an electrical signal (capacitance change), enabling more reliable differentiation between product flow and air flow conditions. This substitution of mechanical detection with electrical sensing eliminates false indications.
2Adaptability or versatility
If the rotating element rotates in response to any fluid flow, then the meter can detect flow, but it cannot distinguish between product and air flow
Solution Approach 1:
The capacitive sensor exploits the parameter change in dielectric properties between product and air. Since product and air have different dielectric constants, they produce different capacitance values when detected by the sensor. This parameter-based differentiation allows the system to distinguish between product flow and air flow, resolving the measurement precision issue while maintaining adaptability to detect any fluid flow.
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 provides precise fluid flow measurement by distinguishing between product and air, reducing measurement errors and ensuring the accuracy of fluid volume calculations, thus maintaining process integrity.
Implementation Method 1
an optical assembly including an optical emitter configured to emit light at the first wavelength into the chamber via the transparent portion of the housing and an optical detector configured to detect light of the first wavelength reflected from inside the chamber
Implementation Method 2
The capacitance between the first and second electrodes can be used to determine various properties about the operation of the system. The controller can detect the presence of a product flowing through the flow meter housing based on the determined capacitance between the first and second electrodes.
Data Source
AI summary
Systems and methods related to a flow meter and/or flow meter operation can include one or more sensors and be capable of detecting parameters of the fluid flowing the flowmeter. One or more sensors can include capacitive sensors having a plurality of electrodes and configured to detect capacitive properties of a fluid flowing through the flow meter. Detected changes in detected properties of the fluid can be evidence of important changes in the fluid, such as an out of product event or a contamination of the fluid.