HPLC accessories

HPLC accessories are the fittings, capillaries, ion sources and consumable hardware that connect, seal and extend a high-performance liquid chromatography system, as opposed to the pump, column or detector that form the instrument itself. They include items like fingertight fitting systems, PEEK capillary fittings and nano-electrospray ionisation sources.

The term refers to the supporting hardware around an HPLC or UHPLC instrument rather than the core modules. It covers the connectors, tubing, seals and interface parts that route mobile phase between modules and link the chromatograph to downstream equipment such as a mass spectrometer.

Fittings and capillaries carry pressurised mobile phase between the pump, injector, column and detector while holding a leak-free seal, with the thread standard and ferrule doing the sealing at each port. Ion sources sit at the end of the flow path and convert the liquid eluent into charged droplets so a mass spectrometer can analyse the separated compounds.

The recurring groups are fingertight fitting systems, PEEK capillary fittings, UHPLC accessories rated for higher pressures, broader liquid chromatography accessories, and nano-electrospray ionisation sources. The fittings and capillaries are the everyday plumbing, while the ionisation sources are the interface hardware that reaches the top of the price range.

They connect and seal the flow path of a chromatography system during normal operation and method development, and they extend the instrument's reach into applications like LC-MS. Nano-electrospray ionisation sources feed separated peptides into a mass spectrometer for proteomics, metabolomics and molecular diagnostics, while UHPLC accessories support reproducible separations in protein purification and immunoassay development.

Start with the pressure rating and match it to the system the part goes onto, since a fitting fine on a conventional HPLC pump will fail at the over-thousand-bar pressures of a UHPLC method. Then confirm the thread standard matches your inlet and pick a bore diameter suited to the method, because too wide adds dead volume and too narrow drives backpressure past what the pump tolerates.

Used accessories are sold in their existing condition, while refurbished ones have been checked or reconditioned before listing. For small connection hardware the critical question is whether the sealing surface has been over-tightened or cross-threaded, so read the condition note on the specific listing rather than relying on the label alone.

Prices run from EUR 4 to EUR 11.662, with the average at EUR 540. That spread reflects what the item is rather than its condition, a single ferrule at the low end and a complete nano-electrospray source at the high end, so the average tells you little about any one item.

The listings cluster around Thermo, Thermo Scientific, Agilent, Waters and Thermo Fisher Scientific. These makers set the dominant thread and connection standards, so parts from them are easier to match to an existing instrument.

A warranty is often possible and is arranged in consultation for the specific listing. Check the listing details and raise it before purchase so the terms are clear for that item.

Parts can be sourced via Questpair. For small items like ferrules and emitters, confirm the thread standard and the part's original fitment so the replacement seats correctly.

Fittings and ferrules are consumables whose life depends on how often they are opened and closed, and a PEEK capillary fitting forced shut once will not seal reliably again. An ion source lasts far longer, but its emitter tip is the wear point and governs its usable life.

Used and refurbished accessories are listed at lower prices than new, and for consumable connection hardware that saving is often the deciding factor once the fit is confirmed. Where you need to weigh the two, check the individual listing and arrange any warranty in consultation.

The Questpair catalogue holds 257 listings from 12 verified suppliers and distributors across 9 countries, spanning new, used and refurbished hardware. You can compare condition and price across several listings of the same model within the catalog.

Lead time and shipping depend on the individual supplier and the item's location, which spans 9 countries. Check the specific listing, and if the detail is not shown you can contact Questpair where specialists respond within one hour.

Fittings and capillaries are not calibrated, but their sealing surfaces should be inspected for deformation or cross-threading before reuse. A nano-electrospray ionisation source needs its emitter tip and spray geometry checked, since these affect performance more than any figure on the box.

Fingertight fitting systems are the most common, swapped constantly during method development by anyone running an LC bench. PEEK capillary fittings and UHPLC-rated parts serve routine LC and sub-2-micron work, while nano-electrospray ionisation sources are reached for by proteomics and LC-MS labs coupling a chromatograph to a mass spectrometer.

Thermo, Thermo Scientific, Agilent, Waters and Thermo Fisher Scientific account for the bulk of the listings. Because these makers hold to their own thread and connection standards, a buyer usually matches the accessory to the instrument maker already on the bench, which removes most compatibility guesswork when a part has to interface with a mass spectrometer.

It is almost entirely what the item is rather than its condition. A single fitting or ferrule sits near EUR 4, while a complete nano-electrospray ionisation source reaches EUR 11.662, because the ion source is complex interface hardware and a ferrule is a one-piece consumable.