How do Robotic Liquid Handling work?
A liquid handler moves precise volumes of liquid by drawing them into a tip or probe and delivering them to a target vessel. In air displacement systems, a piston in the pipette or the robot moves an air column that pushes and pulls the liquid, which stays in a disposable tip. In positive displacement systems, the piston contacts the liquid directly inside a syringe, so volatile, viscous or detergent-like liquids and solvents are handled accurately. Multichannel heads aspirate 8, 96 or 384 tips at once for plate work, and nanolitre dispensers use solenoid valves, piezoelectric elements or capillary tips for very small volumes. Accuracy and precision depend on tip fit, liquid properties, temperature, wetting and aspiration speed, and are verified gravimetrically or photometrically under ISO 8655. Software defines volumes, order, mixing and wash steps, and records every action.
Which Robotic Liquid Handling variants are available?
- Air Displacement Liquid Handler — An air displacement liquid handler uses a piston and an air column to draw liquid into a disposable tip.
- Positive Displacement Liquid Handler — A positive displacement liquid handler uses a piston in direct contact with the liquid inside a syringe.
- Multichannel Liquid Handling System — A multichannel liquid handling system aspirates and dispenses with 8, 96 or 384 channels at once for plate-based work.
- Low-Volume Nanolitre Dispenser — A low-volume nanolitre dispenser delivers reagent volumes from a few nanolitres to a few microlitres.
- Automated Reagent Dispenser — An automated reagent dispenser adds one or more reagents to plates, tubes or membranes in fixed or variable volumes.
How do I choose the right variant?
Match the technology to the liquid and the volume. Air displacement suits aqueous solutions where the tip is changed or washed between samples. Positive displacement suits volatile solvents, viscous liquids, detergents and long runs without tip changes, because the piston touches the liquid. Choose multichannel heads for plate-based work at 8–384 wells, and nanolitre dispensers when reagents are expensive or volumes below a microlitre are needed. Confirm accuracy and precision at the working volumes, and check compatibility with the plates, tips, tubes and reservoirs you use. Consider tip format, deck capacity, mixing and heating options, and software for method editing, audit trails and LIMS exchange. Verify carry-over performance if you run trace analysis, and confirm the service and calibration support available.
Where are Robotic Liquid Handling used?
Robotic Liquid Handling are specified in plate-based assay setup, compound screening, PCR and qPCR setup, sample dilution and transfer, assay reagent dispensing and high-throughput QC.
Which standards and certifications apply?
Work with Robotic Liquid Handling is commonly governed by ISO 8655 (piston-operated volumetric apparatus), ANSI/SLAS microplate standards, IEC 61010-1 (safety requirements for electrical equipment), USP <1058> (analytical instrument qualification), 21 CFR Part 11 (electronic records and signatures) and ISO/IEC 17025 (testing and calibration laboratories). Instrument certifications such as CE marking are confirmed per configuration and never assumed.
What are the key considerations before purchase?
Verify accuracy and precision on installation and at intervals defined by your quality system, using gravimetric checks with water and photometric tests for dye solutions. Control temperature and humidity, since evaporation and viscosity change small volumes. Use the specified tips and fit them correctly, because a poor seal causes volume errors. Clean the deck, wash station and probes on schedule, and inspect for bent or blocked tips. For regulated work, restrict software access by role, retain audit trails and back up methods and data. Define carry-over limits and test them for trace work. Train operators to recognise partial dispenses, bubbles and clogs, and record all calibration, maintenance and method changes.
