3/7/2023 0 Comments Ecd detector liner![]() ![]() “The time frame for the plugging to happen can be months, years, or decades, depending on column bleed and maximum column temperatures,” he says. ![]() Eventually, as the jet becomes sufficiently plugged, the flame can blow out on solvent elution. ![]() ![]() This leads to slowly increasing back pressure on the end of the column, resulting in gradually decreasing column flow and increasing peak retention times. “It may condense in the jet or actually burn, forming silicon dioxide, which slowly plugs the tip of the jet,” Denoyer says. However, two detector-related problems noted above stand out.ĭuring the GC oven temperature program, the stationary phase on the column may slowly bleed off. Thermal conductivity detector (TCD) signal noise or spikes due to ambient pressure fluctuations.ĭenoyer notes that given all the possibilities for problems during a GC run or sequence, detectors generally contribute very few problems.Flame ionization detector (FID) jet plugging.Failure to draw sample due to syringe needle bending or other problem.Running out of a carrier or detector gases, or solvent in autosampler wash vials.However, during a single GC analysis, a multiple-injection sequence, or an analysis of longer duration problems may arise in a number of areas, for example: Isolate system components and steps: confirm proper sample prep, perform a blank run, connect an alternate injector or detector, install a different column.Įric Denoyer, PhD, director of marketing, GC, and workflow automation solutions at Agilent Technologies (Santa Clara, CA), notes that GCs are complex but generally reliable systems.Check the obvious and routine things first: look at maintenance logs, check cables and connections, perform a leak check.Carefully document all maintenance and troubleshooting activity.Restek (Bellefonte, PA), for example, provides some of the best general-strategy rules for troubleshooting methodology: Thanks to the World Wide Web, online troubleshooting tips from vendors are available in seconds, without the need to find and dust off technical manuals. Although most chemists take classes in the theory of gas chromatography (GC), they learn operation and troubleshooting mostly through hands-on operation and laboratory lore. ![]()
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