7-6 The Direct Insertion Probe
Sample cup holder:
Any solvent used in loading can be evaporated by placing the sample cup(s) in
a warm place, for example on top of the GC oven. To avoid solvent vapor
blowing the sample out of the cup, be careful not to heat the cup too quickly.
To remove the sample cup after use:
Gently tap the sample cup out, or unscrew the tip of the DI probe to allow easy
access to the cup.
Used sample cups must be cleaned in a hot flame or washed in solvent before
using again.
Inserting the DI probe into the insertion lock
To insert the loaded probe into the ion source:
1. Ensure that the instrument is pumped-down (evacuated) and ready for
use.
See also: Chapter A, Starting-up and Shutting-down the Instrument.
2. Ensure that the probe insertion lock valve is in the closed position.
Tip: Lubricate the probe shaft with molybdenum disulphide to ensure
smooth travel when inserting it into the probe lock.
3. Insert the probe into the probe insertion lock until the probe reaches the
first stop position.
Caution: Damage to the instrument might occur if the probe insertion
lock is operated with the probe incorrectly positioned.
Caution: Do not use Santovac oil as a lubricant on the probe
shaft; it causes a contamination peak at 446 Da in EI.
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