Instrument Description
Keypad
The keys and commands on the keypad are used to control the operations of the standalone
Gemini.
The keypad window provides information about the analyzer and the current operation; it
consists of four lines.
A keypad is not included when a Gemini is ordered with Windows software.
Vacuum Pump
The Gemini requires a vacuum source achieving 20 x 10
inlet for oil-based or oil-free pumps. If an oil-based pump is used, an anti-suckback valve is
required to prevent oil from being admitted into the Gemini should there be a power failure. A
device to reduce oil vapor backstreaming is also recommended for oil-based pumps.
Appropriate pumps are available from Micromeritics (shown above).
The vacuum pump may be provided by the user as long as it meets the above requirements.
2-10
Oil-based pump
Gemini VII 2390 Service
OIl-free pump
-3
mmHg (or better) at the instrument
Feb 09
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