Isoprime User’s Guide
Version 1.02 IsoPrime100 User’s Guide Page 34 of 219
The rotary pump is connected to the IsoPrime100 by a 2 m length of flexible hose, allowing the
pump to be conveniently positioned behind and below the instrument.
The backing line from the rotary pump is connected to a foreline trap filled with activated
alumina. An isolation valve allows the rotary pump to be isolated from the turbomolecular
pump, enabling the rotary pump to remain operational during the venting of the analyser. This
ensures that moisture from the air is not adsorbed onto the foreline trap, which would prolong
pump-down times.
The isolation valve and foreline trap are mounted on the rear of the IsoPrime100 for easy
access. The foreline trap is fitted with a vent valve, which enables the packing to be replaced
without needing to vent the analyser.
The rotary pump is fitted with an oil mist filter to prevent unwanted emission of pump oil
vapour into the laboratory atmosphere.
An automatic vent valve is fitted to the turbomolecular pump. This ensures that even under
conditions of power failure, the chances of rotary pump oil entering the analyser are minimised.
A filter is fitted to the vent valve to stop unwanted particles entering the vacuum system during
the venting process.
Fans fitted into the instrument housing cool the turbomolecular pump. Two
fans are mounted on the rear panel of the IsoPrime100. One of them is mounted directly
behind the analyser turbo pump and electronics case. This fan draws air into the case,
cooling the analyser turbo pump. The other fan, mounted at the other end of the electronics
case, extracts air from the case, creating a flow of air from right to left.
An EXC100L controller mounted on the left of the IsoPrime100 controls all the components of
the turbomolecular pump.
The source control electronics remain disabled until the turbo pump reaches full speed.
Please refer to the maintenance section and the manufacturer’s manual for service procedures for
all components of the pumping system.
Caution: routine pump maintenance is essential for the reliable
performance of the IsoPrime100. If the manufacturer’s recommended
service schedule is followed, the system will provide continuous trouble-
free operation.
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