BG 800 300 BE / A (0105) TPG 300
17
4.5.2 Measurement range violation
Measuring circuit on
Measuring circuit off
If the measured value is outside the meas-
uring range of the measuring circuit, this will
be indicated if the corresponding measuring
circuit is selected.
If the cold cathode measuring circuit is con-
trolled by another measuring circuit, the dis-
play changes over automatically.
Overrange
1 2 3 4 A B
mbar
B1
PE
0
10
Underrange
1 2 3 4 A B
mbar
B1
PE
0
10
If the upper measuring range limit is
exceeded, the cold cathode gauge
can become contaminated if it re-
mains switched on.
If the under range control is switched off (
→
section 4.7.5) the system cannot distinguish
between a gauge failure, cable interruption
and underrange of a cold cathode measur-
ing circuit. «ur» is displayed in all cases.
Overrange: «or» and exponent indicating
the range limit
Underrange: «ur» and exponent indicating
the range limit
