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Page 23
Leak Detector
The leak detector operates on the Ion Gauge pressure if the
Ion Gauge is in emission, otherwise, it operates on Pirani 1
pressure.
The display is a histogram of the rate of pressure change with
baseline restoration and is accompanied by a tone whose
frequency is modulated by the offset of the histogram.
Use a probe gas, e.g. helium, or volatile blocking agent, e.g.
acetone, at the suspected leak site. If a pressure change is
produced there may be a leak.
Allow the baseline restoration to restore the histogram and
tone close to the centre before continuing probing.
Pressing ENT will change the sensitivity of the leak detector.
The height of the pair of dots to the right of
‘
Leak
’
in the
display indicates the sensitivity. Three levels of sensitivity are
provided for the Ion Gauge and two for Pirani 1.
Temperature
The ambient temperature inside the instrument near the
electrometer is monitored and may be displayed.
Instrument ID
The programmed instrument ID is displayed if defined in
SETUP
→
PASSWORD/UNITS.
Summary of Contents for NGC3
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