HPLC autosamplers

Buying guide

The specification that settles most autosampler purchases is compatibility with the chromatography system it will feed. An autosampler is rarely a standalone buy; it is one module of a stack, and it has to talk to the pump, the column oven and the detector already in place. A Dionex sampler built for a UltiMate stack speaks a control protocol that an older Agilent system may not recognise, and a module from one generation of a maker's range will not always drive from the controller of another. Before anything else, a buyer confirms that the unit's communication interface and injection timing match the existing instrument, or budgets for the control software and interface board that bridge them.

Injection behaviour is the next thing to pin down, because it decides what kind of work the unit can do. Injection volume range, carryover between samples, and whether the design draws a fixed loop or a flow-through needle all shape the result. A sampler that injects down to sub-microlitre volumes with low carryover suits trace analysis; one built for larger, more forgiving injections suits routine quality control. Sample capacity follows from the same logic: a tray that takes two or three vials is not the unit for an overnight run of two hundred.

On a used autosampler, the mechanical path is what to verify. These are instruments with a moving needle, a metering syringe and a sample loop, all of which wear. Ask about needle and seal condition, syringe replacement history, and whether the unit still holds injection precision within spec. A thermostatted tray should be checked for cooling performance, since the refrigeration is a common point of failure on older units and matters for any sample that degrades at room temperature. Where a listing does not state recent service, treat recalibration as part of the cost of ownership.

What a unit costs here spans a wide band. Prices run from EUR 1 to EUR 45.197, a spread that reflects everything from bare parts and accessories at the bottom to complete, recently serviced thermostatted samplers at the top, with the average sitting at EUR 3.320. A used sampler listed for sale is more affordable than its new equivalent, which is the practical reason this market exists: a working module from a previous instrument generation does the same injection as a current one at a fraction of the price. For a buyer with a fixed budget, the question is less which unit is best in the abstract and more which listed unit matches the chromatography system already on the bench. The brands that fill this band are Agilent, Thermo Scientific, Agilent Technologies, Waters, Dionex, and a model from any of them is worth comparing on injection spec, tray capacity and documented service rather than on name alone.

Types of HPLC autosamplers

Which autosampler types are listed here?

Among the listings that specify a type, the labels group into a few recognisable kinds. Most are described plainly as an HPLC autosampler or an automated sample injector, the standard module that pulls sample from a vial tray and injects it into a liquid chromatograph. A liquid chromatography autosampler is the same function named for its instrument context, and the broader liquid handling system label covers units that do more than inject, dispensing and preparing sample before it reaches the column. The distinction a buyer cares about is less the name than the design underneath it: a dedicated injector is simpler and cheaper to keep running, while a liquid handling system adds preparation steps that matter when the method needs dilution, derivatisation or standard addition before injection.

Autosamplers sit at the front of analytical workflows across the life sciences. In proteomics and metabolomics, they feed the liquid chromatography stage that precedes mass spectrometry, loading tryptic digests or extracted metabolites onto the column in sequence. They handle the injection step in bioanalytical assays that quantify a drug and its metabolites in plasma, and they load samples for the protein purification and peptide mapping that support biomanufacturing quality control. A thermostatted autosampler keeping a tray at low temperature is often what protects a labile biological sample through a long overnight genomics or proteomics run, where sample integrity across dozens of injections is the whole point of automating the work.

The brands behind the autosampler listings

The listings are led by Agilent, Thermo Scientific, Agilent Technologies, Waters, Dionex. For a buyer this concentration is useful rather than limiting. These are the makers whose chromatography systems dominate working laboratories, which means parts, metering syringes, needle assemblies and sample loops are the ones most likely to be available, and a used model from any of them has enough installed base that its injection spec and service quirks are documented and comparable. A sampler from a mainstream range is easier to match against an existing stack and easier to source consumables for than an orphan from a maker that has left the field.

What a used HPLC autosampler costs here

New, used and refurbished units all appear, and 96 percent of the listings are used. The price range runs from EUR 1 to EUR 45.197, with the average at EUR 3.320. That spread covers the full distance from accessories and spare parts at the low end to complete thermostatted samplers at the high end. A used or refurbished unit is listed below the price of a new one, and where a buyer wants to weigh the two, the decision turns on the individual listing: warranty is arranged in consultation for the specific unit, and parts can be sourced via Questpair.