Chemical Residue - Agilent Technologies 7250 Troubleshooting And Maintenance Manual

4 General Maintenance
•
•
The foreline pump can cause burns if touched when operating.
WAR N IN G
Never touch these parts while your MS is on. After the MS is turned off, give
WAR N IN G
these parts enough time to cool before handling them.
The GC/MS interface heater is powered by a heated zone on the GC. The
WAR N IN G
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 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 rotary vane
foreline pump also contains tiny droplets of foreline pump oil.
An oil mist filter is supplied with the rotary vane foreline pump. This filter stops
only pump oil droplets. It does not trap any other chemicals. If you are using toxic
solvents or analyzing toxic chemicals, install a hose from the mist filter outlet to
the outdoors or into a fume hood vented to the outdoors. Comply with your local
air quality regulations.
The oil mist filter supplied with the rotary vane foreline pump stops only
WAR N IN G
foreline pump oil. It does not trap or filter out toxic chemicals. If you are using
toxic solvents or analyzing toxic chemicals, vent the exhaust to a safe
location.
The oil in the rotary vane foreline pump also collects traces of the samples being
analyzed. All used pump oil should be considered hazardous and handled
accordingly. Dispose of used oil as specified by your local regulations.
70
Analyzer parts
Vacuum pumps
7250 Accurate-Mass Q-TOF Troubleshooting and Maintenance Manual