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3-10 Prima PRO & Sentinel PRO Mass Spectrometers User Guide Thermo Fisher Scientific
The incoming power supply must include an over-current protection
device rated at a maximum of 40 A continuous operation, but should
be capable of withstanding the appropriate startup period as shown
above without operating. This normally requires the use of a slow-
blow fuse or a circuit breaker specified for motor starting.
The system power should be free from supply ‘drop-out’ over 1/2
cycle or more. If the local power supply is unreliable or noisy, then
power conditioning (e.g. uninterruptible power supply, constant
voltage transformer) of appropriate capacity should be installed.
Refer to Chapter 5: Installation & Interconnection for details.
For all services, the connection type (fractional or metric) will
default to that supplied for the inlet system.
When the vacuum system shuts down, it automatically vents so that
the internal pressure rises up to ambient. Atmospheric air contains
water vapour which, if present in the vacuum chamber, will prolong
the time to pump down when the vacuum system is restarted.
A dry gas vent facility is provided to allow the system to vent with a
clean dry gas (most commonly nitrogen), which significantly reduces
the time required for the subsequent pump down.
Connection is 1/4” / 6 mm compression. Pressure should be in the
range 0.5 to 2 bar(g), minimal flow requirement. An onboard filter /
regulator reduces the delivered pressure to 0.2 bar(g). Nitrogen
supply can be from a cylinder or a plant nitrogen line.
To prevent a build-up of toxic or flammable gases in the enclosure in
the event of a sample leak, a facility is provided to purge the
enclosure with compressed air. For a system operating with an RMS
at an exhaust pressure of 0.2 bar(g), the maximum leakage rate into
the enclosure is 0.25 l/min (consult the factory for leakage rates for
other inlet types or operating conditions).
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