Self-Calibrating Pipetting Device with Decoupled Indicators
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Solution Overview
Problem
Existing pipetting devices suffer from inaccuracies in volume measurement due to deviations caused by factors like liquid density, viscosity, temperature, and air pressure, requiring complex factory calibration or user adjustments that are cumbersome and prone to errors.
Innovation Solution
A pipetting device with a coupling device that allows switching between a use state for volume adjustment and an adjustment state for ambient condition adaptation, using a coupling mechanism to decouple or couple the adjusting device with the volume and adjustment indicators, enabling intuitive and ergonomic volume calibration without altering the lower stop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If factory calibration is performed to eliminate volume indicator deviation, then measurement precision is improved, but device complexity and time consumption increase
Solution Approach 1:
The pipetting device enables users to perform their own calibration without requiring manufacturer intervention or complex factory calibration procedures. The self-calibration mechanism allows users to adjust the volume indicator to match actual dispensed volumes by simply operating the pipette and following basic steps, eliminating the need for professional calibration services while maintaining high measurement precision
Solution Approach 2:
The device includes pre-configured calibration components and procedures that are prepared in advance during manufacturing. Calibration markings, adjustment mechanisms, and instructional elements are built into the device structure, allowing users to perform calibration quickly without needing external equipment or complex preparation steps
2Ease of operation
If user adjustment is performed to change piston stroke, then ease of operation is improved, but reliability deteriorates due to threaded connection errors
Solution Approach 1:
The invention separates the calibration adjustment function from the piston stroke adjustment function. Users adjust the volume indicator independently without modifying the piston stroke or threaded connections. This extraction of the adjustment function eliminates the source of error in threaded connections while maintaining user-friendly adjustability
Solution Approach 2:
The calibration system is divided into independent components: the piston stroke remains fixed and reliable, while the volume indicator is separately adjustable. This segmentation allows each component to perform its function optimally without interfering with the other, maintaining both reliability and ease of operation
3Manufacturing precision
If factory calibration is performed under standard conditions, then manufacturing precision is improved, but adaptability worsens due to environmental condition sensitivity
Solution Approach 1:
The device allows dynamic recalibration by users under actual operating conditions rather than fixed factory calibration under standard conditions. Users can adjust the volume indicator to account for variations in temperature, pressure, and liquid properties specific to their environment, making the system adaptable to changing conditions while maintaining precision
Data Source
AI summary
A pipetting device for taking up and dispensing fluid volumes has a displacement device with a displacement mechanism and a displacement housing. The pipetting device has an adjusting device for changing the stroke of the displacement mechanism. The stroke of the displacement mechanism can be adjusted, and the corresponding adjustment value can be displayed by an adjustment indicator. A coupling device, in a use state, couples the adjusting device to a volume indicator and decoupled the adjustment device from the adjustment indicator. In an adjustment state, the adjusting device is coupled to the adjustment indicator and is decoupled from the volume indicator. The adjustment indicator displays an adjustment value for the stroke of the displacement means. The adjustment indicator can be adjusted in an adjustment state, whereas it is fixed in a use state.