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IPN 074-397-P1G
HAPSITE Smart Operating Manual
15.4 Required Environment for General Maintenance
The HAPSITE is designed for use in the field, away from ideal laboratory
conditions. However whenever the instrument is opened, appropriate care must be
taken to assure the internal components remain uncontaminated. For example,
removing and replacing batteries can generally be performed outdoors, while
avoiding rain or foreign materials from entering the battery compartment. If the
instrument is being used in a contaminated hot zone, the HAPSITE must be taken
to the decontamination area before the door is opened. Opening the front door
breaks the seal of the case and the internal components cannot be
decontaminated by simple procedures. In such a situation, even changing batteries
should be done in the decontamination area.
Changing the NEG pump or the ionizer requires the use of the Service Module.
This module is not designed for use outdoors. The SM should be set up in a
relatively clean indoor area with AC power available. When the vacuum flange
(where the NEG pump is installed) is open, ensure dust, moisture, oils, or other
contaminants are not permitted to enter the Mass Spectrometer manifold.
Be especially careful not to touch the inside surfaces of
the manifold with bare hands. The natural oils on even
clean hands will produce an interfering background
signal on the HAPSITE’s sensitive detection system. The
use of cotton gloves is required when handling any part
of the manifold system.
15.5 Contamination
Contamination of the HAPSITE is defined as the undesirable introduction of a
substance or compound into the instrument. This can consist of anything from
water, to organic compounds with high or low vapor pressures, to liquids. Keep in
mind that the HAPSITE will have no problem detecting trace contaminates on “New
Cleaned Components”. Most of these contaminates can be flushed from the
system by purging the instrument with clean nitrogen and elevating the
temperature of heated zones. If the contamination is severe enough, major system
components may have to be replaced. The two major sub-systems of the HAPSITE
that can become contaminated are the Mass Spectrometer, and the Gas
Chromatograph.
NOTE: High activation temperatures will cause the NEG pump to emit large
amounts of unwanted compounds. This emission will diminish when the
pump cools to operational temperatures.
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