tina03e1 (0206) BPG400 v1.om 3
Over the whole measuring range, the gauge has a continuous characteristic curve
and its measuring signal is output as logarithm of the pressure.
The gauge functions with a Bayard-Alpert hot cathode ionization measurement
system (for p < 2.0×10
-2
mbar) and a Pirani measurement system (for
p > 5.5×10
-3
mbar). In the overlapping pressure range of 2.0×10
-2
…
5.5×10
-3
mbar, a mixed signal of the two measurement systems is output. The hot
cathode is switched on by the Pirani measurement system only below the switching
threshold of 2.4×10
-2
mbar (to prevent filament burn-out). It is switched off when the
pressure exceeds 3.2×10
-2
mbar.
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