Agilent Technologies 7000 Series Operating Manual page 150

7 General Maintenance
Dangerous temperatures
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Never touch these parts while your MS is on. After the MS is turned off, give
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these parts enough time to cool before handling them.
The GC/MS interface heater is powered by a thermal zone on the GC. The
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interface heater can be on, and at a dangerously high temperature, even
though the MS is off. The GC/MS interface is well insulated. Even after it is
turned off, it cools very slowly.
The foreline pump can cause burns if touched when operating. It could have
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an optional safety shield to prevent the user from touching it.
The GC inlets and GC oven also operate at very high temperatures. Use the same
caution around these parts. See the documentation supplied with your GC for
more information.
Chemical residue
Only a small portion of your sample is ionized by the ion source. The majority of
any sample passes through the ion source without being ionized. It is pumped
away by the vacuum system. As a result, the exhaust from the foreline pump will
contain traces of the carrier gas and your samples. Exhaust from the standard
foreline pump also contains tiny droplets of foreline pump oil.
An oil trap is supplied with the standard foreline pump. This trap stops only pump
oil droplets. It does not trap any other chemicals. If you are using toxic solvents
or analyzing toxic chemicals, do not use this oil trap. Install a hose to take the
exhaust from the foreline pump outdoors or into a fume hood vented to the
outdoors. This requires removing the oil trap. Comply with your local air quality
regulations.
The oil trap supplied with the standard foreline pump stops only foreline pump
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oil. It does not trap or filter out toxic chemicals. If you are using toxic solvents
or analyzing toxic chemicals, remove the oil trap.
The fluids in the foreline pump also collect traces of the samples being analyzed.
All used pump fluid should be considered hazardous and handled accordingly.
Dispose of used fluid as specified by your local regulations.
150
Analyzer parts
Vacuum pumps
7000/7010 Series TQ GC/MS Operating Manual