The Advancing Automated Liquid-Handling Systems: Development and Evaluation of a Nonlinear Error-Compensated Air-Displacement Pipettor

Abstract

This study introduces a nonlinear error-compensated air-displacement pipettor (NEC_ADP), a novel system that addresses the key limitations in commercial pipetting setups. By incorporating nonlinear error-compensation (NEC) technology, the NEC_ADP improves the accuracy and precision of liquid handling across a wide range of volumes, from micro-volumes (1 μL) to macro-volumes (up to 1000 μL), and for reagents with varying viscosities and surface tensions. Unlike conventional pipettors, which rely on linear compensation or manual recalibration, NEC_ADP features real-time, online calibration, eliminating the need for factory recalibration and reducing maintenance costs. The system was built with a modular design, allowing seamless scalability from single- to multi-channel configurations. It integrates effortlessly with existing laboratory systems using the open platform communications unified architecture (OPC UA), enhancing interoperability and automation. In addition, the use of machine-learning algorithms for motion control and trajectory planning ensures optimal pipetting strategies and automatic adaptation to different reagents and volumes. This study demonstrates the superior performance of NEC_ADP compared to commercial systems, including the TECAN Cavro® and Eppendorf epMotion®, with significant improvements in accuracy and precision. Innovation in NEC_ADP technology and system integration marks a significant advancement in automated liquid handling, offering robust support for high-precision applications in fields such as genomics, stem-cell research, and synthetic biology.