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DV Device variable MA Start of scale value
PV Primary variable ME Full scale value
SV Secondary variable
TV Tertiary variable
QV Quarternary variable
Figure 7-6 Measuring mode "User"
Functions of the "User" block
The first function, "Input scaling, pressure", defines the pressure range which is used by the
customized characteristic curve. Ideally, this range corresponds to the sensor limits.
In
the calculation example, 0 and 2 bar are assumed. This means that with process pressure
of 0.5 bar, there is a value of 25% on the characteristic curve.
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DV [x] Device variable x MA Start of scale value
p Pressure ME Full scale value
Figure 7-7 Functions of the "User" block
In
the calculation example, the two pairs of values 0%;0% and 100%;100% are configured for
the customized "characteristic curve". Any curve shapes can be calculated with the help of 30
Operating functions through HART
7.3 Selecting the measuring modes
SITRANS P, DS III series with HART
Operating Instructions, 09/2012, A5E00047092-08 109
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