Adjustable Pipette Stroke Calibration for Accurate Volume Indication
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Solution Overview
Problem
Existing pipetting devices suffer from deviations in volume measurement due to density, viscosity, temperature, and pressure and wetting effects, leading to inaccuracies in pipetting volume indication.
Innovation Solution
A pipetting device with an adjustment indicator that allows for separate adjustment states for user calibration and factory calibration, enabling precise adjustment of the pipetting volume by changing the stroke of the displacement device without altering the volume indicator, and vice versa, using a coupling device to switch between these states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the volume indicator is adjusted to match actual pipetting volume, then measurement precision is improved, but device complexity increases due to requiring separate adjustment mechanisms for factory calibration and user calibration
Solution Approach 1:
The adjustment system is segmented into two independent adjustment mechanisms: a first adjustment mechanism for factory calibration that modifies the stroke volume, and a second adjustment mechanism for user calibration that modifies the volume indicator reading. This segmentation allows each mechanism to be optimized for its specific purpose while working together to achieve accurate volume measurement and indication.
2Measurement precision
If the piston stroke is changed to correct volume deviations, then measurement precision is improved, but ease of operation deteriorates because users must perform complex factory calibration procedures
Solution Approach 1:
The adjustment system is segmented into two independent adjustment mechanisms: a first adjustment mechanism for factory calibration that modifies the stroke volume, and a second adjustment mechanism for user calibration that modifies the volume indicator reading. This segmentation allows each mechanism to be optimized for its specific purpose while working together to achieve accurate volume measurement and indication.
3Adaptability or versatility
If separate adjustment mechanisms are provided for factory and user calibration, then adaptability is improved, but device complexity increases due to additional components and adjustment procedures
Solution Approach 1:
The adjustment system is segmented into two independent adjustment mechanisms: a first adjustment mechanism for factory calibration that modifies the stroke volume, and a second adjustment mechanism for user calibration that modifies the volume indicator reading. This segmentation allows each mechanism to be optimized for its specific purpose while working together to achieve accurate volume measurement and indication.
Data Source
AI summary
A pipetting device for taking up and dispensing fluid volumes. The pipetting device has a displacement apparatus having a displacement device and a displacement housing. The pipetting device further includes a drive device for moving the displacement device in the displacement housing, wherein movement of the displacement device is limited by an upper stop, a lower stop, and at least one counter stop of the drive device, so that a stroke of the displacement device is defined. The pipetting device further has an adjustment indicator for indicating an adjustment value of the stroke of the displacement device. In an adjustment state, the stroke of the displacement device is adjustable, and the adjustment indicator is adjustable. In a state of use, the stroke of the displacement device is adjustable and the adjustment indicator is fixed.