4 | Commissioning
FISCHER Mess- und Regeltechnik GmbH
18/40
BA_EN_DE45_ATEX_LCD
4.3.3 Menu Level Measuring
Parameter name
Description
Value range
MB start
Measuring range start
Basic measuring
range
MB end
Measuring range end
Basic measuring
range
Unit
Measuring range unit
bar, mbar, Pa, kPa,
MPa, psi, InWc,
mmWs, mmHg
Limit
Measuring range limit
yes, no
The transmitter output signal primarily depends on the sensed pressure. How-
ever, you have the option of adjusting the output signal to a large extent to suit
your requirements.
NOTICE
Adjustment of the output signal
The basic measuring range (indicated on the type label) and the type of output
signal (voltage / current) are not variable.
The parameters
MB start
and
MB end
initially define the two pressures
between which the output signal will change at all. Both values are adjustable
across the entire basic measuring range. The set values also refer to the pres-
sure in the respective unit. However, the signal values (current / voltage) for
‘Start of measuring range’ and ‘End of measuring range’ are fixed.
If
MB start
is smaller than
MB end
, this is called an increasing characteristic
curve; the output signal increases as the pressure increases.
If
MB end
is smaller than
MB start
, this is a decreasing characteristic curve and
the output signal decreases as the pressure increases.
The difference between the values
MB start
and
MB end
must be at least 25 %
of the basic measuring range.
You can select a unit other than the unit of the basic measuring range with the
parameter
Unit
. The user should remember however that not every unit is suit-
able. The conversion is automatic.
The parameter
Limit
allows the display, output and switching points to be lim-
ited to the range between Start of measuring range and End of measuring
range. This makes sense when content is measured to avoid "negative con-
tents". If Limit is set to "no", those measured values that are greater or smaller
than the end values are shown.