The Liquid CI Inlet Option
Liquid CI is an effective tool for internal ionization CI. Because of the difficulty of
getting sufficient CI reagent into the external source, Liquid CI is not
recommended for external CI use. Once the Liquid CI inlet Assembly has been
installed, it is possible to switch between using a pressurized CI Gas and using
liquid CI reagents, without removing the assembly. Switching from Gaseous to
Liquid CI Reagent Operation:
1. Loosen the 2 screws that attach the CI Gas restrictor to the CI shutoff block
in the back of the instrument. If there is no Liquid CI restrictor attached to the
Liquid CI Inlet Assembly, also loosen the two screws that attach the L
bracket to the assembly.
2. Remove the 4 mL/min gas restrictor from the CI shutoff block.
3. Install the Liquid CI restrictor between the Liquid CI Inlet Assembly and the
CI shutoff block. If you are in Internal Configuration, use the 50 mL/min
restrictor (03-930024-01). For Hybrid Configuration, use the 200 mL/min
restrictor (03-931440-01).
4. Tighten all screws.
5. Adjust CI reagent as described in the User Manual.
Filling/Refilling Reservoir Bulb
1. Be sure the CI valves are closed. Loosen the four screws that retain the
liquid CI reservoir cover. The screws 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 1 mL 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 four screws can engage the cover. Tighten the
four 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 2-3 minutes after opening the CI valves from the Manual
Control Page.
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