7-4 The Direct Insertion Probe
Inserting and removing the DI probe
This section explains the following tasks:
• Loading sample into the probe.
• Inserting the probe.
• Removing the probe.
Loading sample into the DI probe
Two types of quartz sample cup are available:
• For nonvolatile samples, the shallow cup (type D) is recommended. It is
often unnecessary to heat the probe because the sample is close to the
heated ion source.
• A deep cup (type C) is used for more volatile samples. The sample is
placed at the bottom of the cup to reduce the heating effect of the ion
source. The sample can then be evaporated into the ion source using the
probe heater, if necessary.
Requirement: Used sample cups must be cleaned in a hot flame and/or
washed in solvent and then allowed to cool and/or dry completely before being
loaded with reasonable amounts of sample.
Warning: To avoid contamination with samples wear
chemical-resistant, powder-free gloves at all times when
handling the probe.
Caution: Do not use sample cups over 18 mm in length, which
will damage the probe insertion lock valve.
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