Siemens SITRANS P DS III - Units of the Pressure Transducer Block

Operator control functions via PROFIBUS
7.1 Communications structure for PROFIBUS PA
SITRANS P DS III with PROFIBUS PA
102 Operating Instructions, 06/2013, A5E00053276-07
x
Measurement range, here e.g. pressure (secondary variable 1)
y
Working range, here e.g. volume, measured value (primary variable)
Figure 7-4 Entry of a user-defined characteristic using nodes x(i), y(i)
The following table describes the vendor-specific parameters used with the flow
measurement type and that supplement the root function.
Table 7- 4 Vendor-specific parameters for flow measurement
Parameter
Description
Application point of the root function This parameter specifies the flow point as a % at
which the differential pressure is set in a linear
relationship to the flow.
Creep volume suppression This parameter specifies the flow point as a %
below which the flow becomes 0.
7.1.3.3
Units of the pressure transducer block
In the pressure transducer block you have the option of setting units in four different places.
Depending on the measurement type, units are allowed from the following measurement
functions:
Table 7- 5 Overview of available units
Variable
Measurement type
Pressure
Level
Volume
Volume flow
Mass flow
Raw pressure value
P
P
P
P
P
Secondary variable 1
P
P
P
P
P