Siemens SITRANS P500, Руководство по эксплуатации, Страница: 157 / 238

Operate
6.3 Description of the operating functions
SITRANS P500 with HART
Operating Instructions, 12/2014, A5E02344528-09
157
6.3.5 Correction of the flow characteristic
Correction of the flow on the basis of the differential pressure transducer calculation protocol
Based on the specific properties of the differential pressure transducer, a correction of the
selected flow characteristic to increase the accuracy may be necessary.
This provides the option to correct the flow characteristic at 11 interpolation points. These
interpolation points are distributed equidistantly on percentage values of the selected flow
range.
Example: Measuring span 0 ... 14,000 m² / h
First interpolation point at 0 m² / h (0 %)
...
Eleventh interpolation point at 14,000 m² / h (100 %)
For calculation of the orifice-specific correction values, refer to the data in the calculation
protocol issued by the orifice manufacturer.
For ease of calculation, technical support (Page 227) is available on the Internet.
See also
"2.1.4.7 Correction Curve Activation" (Page 89)
"2.1.5.7 Correction Curve Activation" (Page 93)
6.3.6 Setting the current limits
Description
The level of the upper and lower fault current and the upper and lower saturation limits can
be freely selected within the preset limits of the current output signal.
The specified accuracy of the current output signal only applies within the current limits 4 to
20 mA.