Reference reservoir inlet 1-7
Reference reservoir inlet
A separate reference reservoir inlet allows the introduction of volatile
reference material. The reference inlet introduces reference materials
required for calibration and mass measurement.
See also: Figure titled “Reference reservoir pump valve and reference inlet:”
on page 1-11.
Use a septum-piercing syringe to introduce reference liquids into the
instrument through the hole in the center of the reference reservoir inlet cap.
A septum in the cap is made of silicon rubber backed with Teflon
®
and is
leak-proof (when fitted with the teflon coat facedown). However, the septum
can start to leak when you make repeat injections of reference material, use a
damaged needle tip, or over-tighten the reference reservoir inlet cap. Renew
the septum when required.
See also: Reference reservoir maintenance on page 10-16.
Vacuum system
The GCT Premier vacuum system incorporates two vacuum systems: fore
pumping and fine pumping. Before the fine pumping can be operated, the
region to be pumped has to be fore pumped. Fore pumping can achieve a
vacuum level of approximately 1e-3 kPa (1e-2 mbar, 1.45e-4 psi) inside the
instrument. Fine pumping is able to achieve vacuum levels in the region of
1e-8 kPa (1e-7 mbar, 1.45e-9 psi), which is necessary to achieve the ultimate
performance of the mass spectrometer.
The fine pumping is provided by turbomolecular pumps, which are controlled
via the MassLynx™ software. The fore pumping is provided by either an
oil-based rotary vane pump (supplied as standard), or an optional oil-free
scroll pump. The pump is controlled by a switch on the pump.
There are two main pumping regions in the GCT Premier:
• The source housing.
• The analyzer housing.
The source housing and analyzer housings are fine-pumped respectively by
250 L/s and 70 L/s air-cooled, high-compression turbomolecular pumps. A
single oil-cooled rotary fore pump or, optionally, an oil-free scroll fore pump
backs both the turbomolecular pumps.
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