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Chemical Ionization Options
Filling/Refilling the Liquid CI Reservoir Bulb
1. Be sure the CI valves are closed. Disengage the 4 screws that retain the
liquid CI reservoir cover. They may remain in the block.
2. Remove the reservoir cover.
3. Gently pull the bulb down to remove it from the block. The O-ring and O-ring
retainer may stay attached to the bulb.
4. Use the reservoir cover as a stand for filling; place the bulb into the reservoir
cover. Place O-ring retainer over the bulb stem. Place the O-ring over the
bulb stem.
5. Use a pipette or syringe to fill the bulb halfway with liquid CI reagent. This
requires about 3 mL of reagent.
6. Pick up the reservoir cover with the bulb, retainer and O-ring, and insert the
bulb stem into the block.
7. Orient the cover so that the 4 screws can engage the cover. Tighten the 4
screws, being careful not to strip the threads in the plastic cover.
8. After installing liquid CI, and each time the reservoir bulb is refilled with liquid,
always use care when first opening the CI valves. Do not turn on the filament or
multiplier for about 2-3 minutes after opening the CI valves from the Instrument
Page. A convenient way to verify that air and water have been removed
sufficiently is to check the ion gauge pressure with the CI valves open. Verify
that the pressure has returned to less than 35 x 10
-6
Torr before turning on the
Filament and Multiplier. For diffusion pumped systems monitor the foreline
pressure. Adjust the CI valve to prevent the foreline pressure from exceeding
500 mTorr. Turn the valve clockwise to reduce the pressure.
Use Polypropylene Caps to Preserve Liquids in
Reservoirs
Yellow polypropylene caps have been provided to seal reservoirs containing
liquid CI reagents when they are not installed on the instrument.
CAUTION
Never force the cap onto the reservoir stem – it is glass and can break.
Use safety glasses and protective gloves, especially when attempting to
remove a cap from a filled reservoir.
•
Use a gentle, twisting/pushing motion to install the plastic cap onto the
reservoir stem.
•
Use a gentle twisting/pulling motion to remove the plastic cap from
reservoir stem.
Be careful not to spill any liquid, especially the few drops which may be in the
neck of the bulb.
