33
7 Commissioning
7.8
Setting scaling
Customer-
specific
measuring
range
The customer measuring range (2) is defined by:
- Range start (4)
- Range end (5)
- Span (MSP)
Example
Actual
The instrument has a nominal measuring range (1) from 0 to 4 bar
Target
The customer would like to measure the pressure in the range from 1 to 2 bar
(25% of the nominal measuring range).
Range start (5) is 1 bar
Range end (6) is 2 bar
Span (MSP) is 1 bar
Scaling
The scaling of the instrument's output signal describes how the measured
pressure is converted into an output signal.
Simple
example
Actual
The instrument has a nominal measuring range (1) from 0 to 4 bar and
the instrument has an output signal from 4 to 20 mA (3).
Target
The customer would like:
the "Customer measuring range" (2) from 0 to 4 bar (100% of nominal
measuring range (1)
should correspond to the output signal (3) from 4 to 20 mA (100%).
The scaling is 1: 1 (100% to 100%).
Customer-
specific scaling
It is often useful to scale part of the nominal measuring range to the
output signal.
0
4 bar
2
1
1
2
3
5
4
4 bar
4
20 mA
2
1
100%
100%
3
0
1
2
3
Summary of Contents for 405052
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