8-6 The Direct Chemical Ionization (DCI) Probe
Rationale: The light indicates that the inlet pressure has fallen below
the trip level set on the Pirani gauge. If it fails to illuminate, check the
insertion lock for leaks and the insertion lock O-ring for damage.
7. Open the probe insertion lock valve.
8. Pull back the sprung-loaded probe retaining knob (located on the probe
insertion lock).
9. Slowly push the probe fully in.
Rationale: The probe creates a seal so that the CI gas is retained in the
inner source.
Note: The threaded probe stop collar ensures the probe remains at
required distance from the ion source.
Removing the DCI probe from the probe insertion lock
To remove the probe:
1. In the Tune window Inlet tab, set DCI Probe Current to 0.
2. Withdraw the probe to the first stop only.
3. Close the probe insertion lock valve.
Caution: Ensure the probe is fully in by adjusting the threaded
probe stop collar clockwise.
Caution: To avoid damage to the probe, reduce the current before
attempting to withdraw the probe from the probe insertion lock.
Caution: o avoid damage to the instrument, close the probe
insertion lock valve before withdrawing the probe further than
the first stop.
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