IsoPrime User’s Guide
Version 1.01 IsoPrime100 User’s Guide Page 35 of 219
PRESSURE MEASUREMENT
PIRANI GAUGE
An AFG. S NW16 active Pirani gauge is used to measure the pressure in the analyser
pumping backing line. This gauge is located adjacent to the turbo pump roughing port
and continuously measures the vacuum whenever the electronics unit is powered.
PENNING GAUGE
A Penning or Active Inverted Magnetron AIM gauge is fitted to the ion optics housing to monitor
the pressure of the system. The gauge is mounted on a NW25 elbow beneath the collector end
of the housing. The software displays the measured pressure.
The Penning gauge is controlled and monitored from the electronics unit, which is located on
the right-hand side of the IsoPrime100 cubicle. The gauge is enabled as soon as the turbo pump
reaches ~95% speed.
The system protects the Penning gauge against over-pressure by monitoring the turbo pump
speed. If the turbo pump speed drops below 95%, the gauge is disabled.
Any condition that results in over-pressure will also cause the ion source power supply to be
switched off.
ELECTRONIC UNITS
Warning: the electronic units have the potential to cause serious injury. If
the instrument is used in a way not specified by the manufacturer, the
protection provided by the equipment may be impaired.
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