INFICON HAPSITE Smart Plus Chemical Identification System - Manual (Page 505)

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HAPSITE Smart Plus Operating Manual
16.4 Required Environment for General Maintenance
The HAPSITE is designed for use in the field, away from ideal laboratory
conditions. However, when the HAPSITE is serviced, appropriate care must be
taken to assure the internal components remain uncontaminated. For example,
removing and replacing batteries can generally be performed outdoors, as long as
rain or foreign materials do not enter the battery compartment. If the HAPSITE 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 Service Module 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.
CAUTION
Do not touch the inside surfaces of the manifold with
bare hands.The natural skin oils 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.
16.5 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 contaminants on “New
Cleaned Components”. Most of these contaminants can be flushed from the
system by purging the HAPSITE 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.