Agilent 1200 Series HPLC Troubleshooting and Service

The 1200 is the next form of the 1100: faster injection cycles and a better detector, while staying fully compatible with 1100 methods — so moving a method across does not force you to revalidate the separation. It is the sensible step when 1100 throughput has become the bottleneck but the methods themselves are settled.

Often, yes — the two series share a modular design, so pumps, autosamplers, column compartments and detectors are frequently combined across the generations. Check the control software and firmware compatibility for the exact combination first, and the wear parts in each module: pump seals and check valves, the autosampler needle and rotor seal, and lamp hours in the detector. Send us the module list and we will confirm.

Rising backpressure almost always means a blockage — the analytical column, the guard column or the in-line filter — and the most common cause is precipitated buffer. Phosphate and similar buffers must never be flushed straight into an organic solvent: the salt crystallises and can block the pump, injector and column together. The safe order is buffer, then water, then organic. If the pressure falls or fluctuates instead of rising, look at the pump seal, the check valves or a leak.

The predictable ones: the deuterium lamp in the UV detector (roughly 2000 hours of use), pump seals, pistons and check valves, the injector rotor seal and needle seat, in-line filters and solvent frits, the guard column, PEEK and steel fittings, ferrules, vials and septa. These are the parts that come up on service visit after service visit, and the ones worth keeping on the shelf.

Four causes cover most cases: the detector lamp is at the end of its life, there is air or dirt in the flow cell, the mobile phase is not mixing or degassing properly, or the room temperature is changing during the run. Work through them in that order before assuming an electronic fault. Our checklist Diagnosing HPLC baseline noise and drift walks through it step by step.

Send the brand and full model, the serial number (spares and warranty are tied to it), what the instrument is doing in your own words — "pressure is rising", "no peak" — since when and whether it started suddenly, any error message on the screen, when the last preventive maintenance or calibration was done, and whether the unit is under warranty, under an AMC or a paid visit. We do not promise a fix before seeing the instrument: one pressure complaint can have five different causes.

Yes. Vision Analytical is based in Ambernath in Thane district and has worked with laboratories across Maharashtra and Gujarat since 2022, including Mumbai, Thane, Navi Mumbai, Pune and Ahmedabad. When you enquire, share the laboratory address and the instrument's full model name. Coverage does not mean a branch office or a guaranteed response time in every city — scheduling is confirmed directly with you.

An AMC covers the engineer's visits and labour — typically two preventive visits a year plus breakdown calls — with spare parts charged separately. A CMC is comprehensive: the wear parts are included too, although items such as lamps, columns and glassware are often excluded and the contract wording decides. Calibration is scheduled every 6 or 12 months according to your own SOP, not ours. Our article AMC vs CMC: what's the difference? goes through how to choose.