Agilent Technologies 6850 Series II User Manual

Routine Maintenance: Detectors
Maintaining a flame ionization detector (FID)
Released: March 2004 6850 Series II GC User Information page 195 of 256
d. Remove the jet from the bath and rinse it thoroughly with hot tap
water and then with a small amount of methanol.
e. Blow the jet dry with a burst of compressed air or nitrogen and then
place the jet on a paper towel and allow it to air dry.
Maintaining the collector
The collector requires occasional cleaning to remove deposits (usually con-
sisting of white silica from column bleed, or black, carbonaceous soot).
Deposits reduce sensitivity and cause chromatographic noise and spikes.
The cleaning procedure presented here suggests you use an ultrasonic bath to
clean the collector and other parts of the detector. If your collector is not too
dirty it may be sufficient to scrub it with a nylon brush and then use a burst of
compressed air or nitrogen to blow stray particles away.
This procedure is divided into three steps: removing the collector, cleaning the
collector, and reassembling the detector.
Tools
• T-20 Torx screwdriver
• 1/4-inch nut driver
• Small ultrasonic cleaning bath
• Flame detector cleaning kit (part no. 9301–0985)
Removing the collector
1. Load the SERVICE method or reset the inlet, detector, and oven
temperatures to OFF or turn the main power switch off. Let the heated
zones cool to room temperature.
Warning Shock hazard. Turn off the electrometer or the GC main power.
2. Confirm that the electrometer is turned off. If you are not sure, turn the GC
main power switch off.
3. Turn the inlet and detector gas pressures off at the sources.
4. Loosen the knurled brass nut. Lift the top assembly straight up. The upper
Teflon insulator might stick to the bottom of the assembly. Remove the
insulator.

Agilent Technologies 6850 Series II Specifications

General

Brand	Agilent Technologies
Model	6850 Series II
Category	Laboratory Equipment
Language	English