Dosing Device Electrostatic Interference Mitigation
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Solution Overview
Problem
Existing dosing devices face challenges in accurately measuring small masses of powdered substances due to environmental influences like air movements and electrostatic charges, which can lead to significant deviations in weighing results, especially when dealing with non-conductive materials.
Innovation Solution
A dosing device with a weighing system, processor unit, storage unit, and ionizer, where the dosing unit is displaceable relative to the load receptor, allowing for precise measurement by minimizing electrostatic influences through periodic ionization and calculating corrected masses using start and end weighing values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ionizers are used to eliminate static charges, then electrostatic influences are reduced, but electromagnetic fields and air movements negatively impact weighing values
Solution Approach 1:
A conductive element is introduced as an intermediary between the dosing unit and the target container. This conductive element acts as a mediator that dissipates electrostatic charges without requiring the dosing unit itself to be conductive, thus eliminating static charges without generating harmful electromagnetic fields or air movements that would affect weighing accuracy
Solution Approach 2:
The dosing unit is divided into separate components: the dosing unit body (which can remain non-conductive) and a separate conductive element (dosing tip or coating). This segmentation allows the non-conductive dosing unit to maintain its material properties while the conductive element handles charge dissipation, preventing interference with the weighing system
2Measurement precision
If all parts are made electrically conductive and grounded, then electrostatic charges are eliminated, but manufacturing effort and cost increase significantly
Solution Approach 1:
The dosing unit is divided into separate components: the dosing unit body (which can remain non-conductive) and a separate conductive element (dosing tip or coating). This segmentation allows the non-conductive dosing unit to maintain its material properties while the conductive element handles charge dissipation, preventing interference with the weighing system
Solution Approach 2:
Instead of making the entire dosing unit conductive, only the specific local area that contacts the powdered substance (the dosing tip or outlet region) is made conductive. This localized approach eliminates electrostatic charges where they matter most while minimizing manufacturing effort and preserving the benefits of non-conductive materials for the rest of the structure
3Manufacturing precision
If the dosing unit is placed close to the target container for precise dosing, then dosing accuracy improves, but electrostatic attraction or repulsion increases
Solution Approach 1:
The conductive element is activated before the dosing process begins to dissipate electrostatic charges from the dosing unit and target container. By eliminating static charges in advance, the dosing unit can be positioned close to the target container for accurate dosing without experiencing electrostatic attraction or repulsion forces that would compromise dosing precision
Solution Approach 2:
A conductive element is introduced as an intermediary between the dosing unit and the target vessel, allowing the dosing unit to be positioned close to the target container for precise dosing while the conductive element dissipates electrostatic charges to prevent repulsion or attraction forces
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
This method enables precise detection and dosing of materials by reducing electrostatic interference, achieving accurate mass measurements and concentrations, even with non-conductive target vessels, thereby improving the reliability of sample preparation processes.
Implementation Method 1
ionizers are offered, by means of which the air surrounding the dosing unit and the target vessel can be ionized, thereby effectively eliminating static charges
Data Source
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AI summary
The method involves moving a dosing unit (105) arranged above load sensor (191), between original position and pivoted position. A weight value of target vessel (200) placed on load sensor is determined by weighing system (190) and is stored in storage unit, when dosing unit is in original position. The sample dosing process with respect to target vessel is performed in accordance with determined weight value, when dosing unit is moved to pivoted position. A end weight value is determined by the weighing system when dosing unit is moved to original position. Independent claims are included for the following: (1) computer program for providing sample; and (2) dosing device.