if iturn off chemstation will the source cool down

#If iturn off chemstation will the source cool down install
#If iturn off chemstation will the source cool down free

Turn the detector OFF and wait for it too cool to room temperature.Ģ. If you think this may be the cause of the ignition issue, please follow the following steps:ġ. not withdrawn 1~2 mm before tightening the column nut) will 'block' the jet and cause ignition problems. A column installed too deep into the FID (i.e.

#If iturn off chemstation will the source cool down free

All other gases used in the FID also need to be free from contaminants and moisture.Ĭaution: Use clean, lint-free gloves to handle detector parts to avoid contamination.

Agilent recommends using good quality compressed air ( Air for flame detectors should be zero grade). S ynthetic air which has a low proportion of oxygen will lead to igniting failures. In this case, please contact your local Agilent service representative. If the supply pressure is ok, it may be a faulty Electronic Pressure Control (EPC) that needs replacing.

#If iturn off chemstation will the source cool down install

If the distance of the gas supply is far from your GC, you should install a pressure regulator at the back of GC to regulate the supply pressure. If it does not, check the gas supply (it should be able to provide 80 psi supply pressure to the back of the GC. If required, these flow rates can be adjusted (in some cases, you need a higher hydrogen flow to get ignition).įor checking the actual gas flows, turn all gas flows OFF and then turn ON each gas individually. The actual flow should meet the setpoint easily. Make sure that the final hydrogen-to-air ratio is between 8-12%, The default gas flows for an FID are:Ģ5 ml/min for makeup (check that the correct makeup gas is configured) − For 7890 GCs, please press or > lit offset on the GC front keypad.Ĭheck that the gas flow setpoints are sensible, and that the actual flows in the GC can meet the setpoints. If you suspect this is the case, lower the lit offset and see if it helps. the gases are extremely clean) the default offset value of 2.0 pA is too high, and the FID will struggle to stay lit. If the FID signal drops below this value, the GC thinks the flame has gone out and will attempt re-ignition (see Figure 1). The default lit offset for an FID is 2.0 pA. If the FID is in error state ('front/back detector failed to ignite'), you will need to turn the flame OFF before continuing.Įnsure that the FID temperature is high enough for ignition (>150 ☌), the GC will not attempt to ignite the flame at a temperature 300 ☌, which provides a good starting point for easier ignition, and minimizes water condensation. Press on the GC keypad or Diagnostics on the touchscreen display to gather any more information about faults. Warning: Hydrogen is a combustible gas, so do not run high hydrogen flows for extended periods with the FID flame off.īefore troubleshooting, check if any recent maintenance has been performed on the FID, or if anything else has recently been changed on the system or in the method parameters. valve systems).Ĭheck how to troubleshoot each one of these potential causes below. The jet is plugged: or the column is not installed correctly in the FID jet.Ī leak: the jet is not screwed in tight enough, the ferrule or column nut is leaking, the adaptable fitting is leaking (if present) or the collector base is leaking.Įlectronics: the collector is grounding (not insulated properly).Ĭolumn flow: is too high, or abrupt change in column flow (e.g. The ignitor: it has corroded, is broken and/or no longer glowing. Gas quality: if the supplied air has a low proportion of oxygen, or gases from the generator contain significant levels of contaminants, such as water.

If the FID is having ignition issues, it is due to the following causes:įID gas flows: if the air, hydrogen, or makeup gas flows are not correct (or not meeting setpoints). This article is a troubleshooting guide for when the Flame Ionization Detector (FID) does not ignite or the flame keeps going out.