HPLC detectors

An HPLC detector is the sensing instrument that registers analytes as they elute from a high-performance liquid chromatography column, turning a chemical signal into a chromatographic peak. It sets what a liquid chromatography system can measure and at what sensitivity.

The term refers to the module in an HPLC system that reads the separated compounds after they leave the column. It does not separate anything itself; it detects what the column has already resolved and reports it as a signal over time.

They respond to a physical property of the eluting compound, such as ultraviolet absorbance, refractive index change, or fluorescence, and convert that response into an electrical signal plotted as a peak. The detection principle determines which compounds produce a signal and which pass unseen.

The catalogue runs from broad labels like hplc detector, analytical detector and chromatography detector down to specific principles. The uv-vis detector reads absorbance at selected wavelengths, the photodiode array detector records the full UV to visible spectrum at once, and liquid chromatography detector covers refractive index, fluorescence and electrochemical modules outside the UV family.

They do the reading in liquid chromatography based assays across pharmaceutical analysis, protein purification, peptide mapping, metabolomics and clinical diagnostics. Applications include small-molecule purity checks, amino acid and vitamin assays, and residue testing where fluorescence extends sensitivity into the trace range.

Match the detection principle to your analyte first, since that fixes what the instrument can see. A UV-Vis detector only reads compounds that absorb UV or visible light, a refractive index detector reads chromophore-free compounds like sugars at lower sensitivity, and a photodiode array captures a full spectrum when peaks must be identified rather than counted.

A used detector is sold in its existing condition, while a refurbished unit has had service work and checks applied before sale. On this page every current listing is used, and condition details are stated on the individual listing.

Listings range from EUR 20 to EUR 64.567, with the average at EUR 4.913. The low end is typically a bare module without lamp or documentation, while the high end is a fully specified detector with a current lamp and a serviced cell.

The listings concentrate among Waters, Agilent, Agilent Technologies, Shimadzu and Thermo Scientific. These are the makers whose detectors appear often enough on the secondhand market to compare one model across several listings.

A warranty is often possible and is arranged in consultation for the specific listing rather than set centrally. Confirm both condition and terms on the listing itself before buying.

Parts such as lamps, flow cells and seals can be sourced via Questpair. The brands that dominate the listings tend to have parts that stay in circulation, which makes keeping a module running more practical.

The detector body outlives its consumables, but the deuterium lamp has a finite rated life and dims with hours of use, and the flow cell can scratch, leak or accumulate deposits over time. Lifespan in practice depends on lamp hours and flow cell condition, which is why both are the key checks on a used unit.

Used and refurbished units are listed at lower prices than new, and the average listing here falls well below a new instrument of the same class. Where warranty matters, it is arranged in consultation for the specific listing, so check the listing to weigh a cheaper bare unit against a dearer serviced one.

The Questpair catalogue holds 277 HPLC detector listings from 12 verified suppliers and distributors across 7 countries. The same model often appears at more than one condition and price point.

Lead time and shipping depend on the individual supplier and the item's location, since listings come from verified suppliers and distributors across 7 countries. Check the specific listing for its availability and dispatch details.

Routine upkeep centres on lamp replacement when output drops, flow cell cleaning to control baseline noise, and wavelength verification against a known standard. Ask a seller for a recent baseline trace or noise specification rather than a photograph to gauge the condition of a used unit.

The uv-vis detector is the general workhorse for routine quantification, while the photodiode array detector sits above it for method developers who need peak confirmation by spectrum. Broader entries such as liquid chromatography detector and chromatography detector cover refractive index, fluorescence and electrochemical modules for analytes the UV family cannot reach.

Listings concentrate among Waters, Agilent, Shimadzu and Thermo Scientific, which means a given model can usually be compared across several listings and its lamps and cells stay in circulation. A module from one of these lines is easier to price, easier to match against a known specification, and easier to keep running than an orphaned model from a discontinued line.

At the low end near EUR 20 a unit is typically a bare module stripped of lamp and documentation, suited to a buyer who already holds spares. At the high end near EUR 64.567 sits a fully specified detector, often a photodiode array, with a current lamp and a serviced flow cell, so the gap reflects lamp life, cell condition and completeness rather than the detection principle alone.