Siemens SITRANS P500, Руководство по эксплуатации, Страница: 148 / 238

Operate
6.3 Description of the operating functions
SITRANS P500 with HART
148
Operating Instructions, 12/2014, A5E02344528-09
Figure 6-8 Measuring mode "Volume"
Example
All three measurement types specify in the same way the measuring range limits for the
pressure range with which the following functions work. Ideally, this range corresponds to the
sensor limits of the pressure transmitter.
For all settings, it is permissible to exceed the maximum measuring range by no more than
+/-10 %. Values that lie above or below this range are rejected by the device.
In the following calculation example these sensor limits are taken as 0 and 4 bar. You can
also set up a down-scaling; e.g. 1:2. A down-scaling of 1:2 corresponds to 50 % of the
nominal measuring range, i.e. in this case 2 bar, which controls 100% of the following
characteristic.
In the calculation example the 2 value pairs 0 %;0 % and 100 %;100 % are assigned
parameters to the level characteristic. This setting corresponds to the standard setting. The
measured value in this example is passed on from the pressure scaling 1:1.
For diagram see Measuring mode "Level" (Page 145)
Select the "Volume" measuring mode with a unit from the volume range and the measuring
range limits. The output of the characteristic acts directly on the input of the volume scaling.
In the calculation example, this yields a volume of 5000 l for measuring range limits of 0 and
10 000 l at a process pressure of 1 bar.
See also
"2.1.7 Volume" (Page 95)