21
7. Programming
7.2 Linearisation
With
the
linearisation,
the
IPM5
and
IPW5
offer
the
possibility
of
linearising
strain
gauge
sensors
for
the
display
of
the
measurements
and
their
further
processing
(analogue
output),
in
addition
to
the
2-point
calibration,
a
maximum
of
30
calibration
points
can
be
programmed.
Example:
For
the
programming
of
e.g.
5
additional
calibration
points,
the
number
5
must
be
entered
under
PN100.
Subsequently,
for
each
of
the
calibration
points,
the
pressure
must
be
placed
on
the
sensors,
and
the
corresponding
display
value
programmed
under
the
following
program
numbers
PN101–PN105.
The
sensor
signal
must
be
parameterised
with
a
strictly
monotonous
rising
configuration.
A
gap
of
at
least
+1
digit
to
the
previous
display
value
should
be
adhered
to,
otherwise
it
will
be
rejected
through
non-appearance
of
the
storage
notice,
see
“Saving
parameters”.
Supporting point
(PN)
Pressure
[mbar]
Output transducer
[mV/V]
Display before
correction (IN)
Desired display
(OUT)
2
0
0.05
2.5
0.0
101
15
0.33
16.5
15.0
102
30
0.62
31.0
30.0
103
40
0.92
46.0
40.0
104
60
1.14
57.0
60.0
105
75
1.47
73.5
75.0
1
100
2.00
100.0
100.0
Linearisation of a pressure transducer for 0...100 mbar with a sensor of 2 mV/V.