INFICON BPG400 ATM to Ultra-High Vacuum Gauge - Manual (Page 3)

tina03e1-b (2004-02) BPG400 v1.om
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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
2.0Ч10 -2 … 5.5Ч10 -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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