Measurement Type "User - Siemens SITRANS P300 Operating Instructions Manual

Operating functions via HART
7.4 Selecting the measurement type
Figure 7-3 Functions of the level block
DV [x] Device variable x
MA Zero value
ME Limit value
L Level
The "Output scaling, volume" has to be configured with a unit from the volume range and the
measuring limits for the device variable "Volume". The characteristic curve output directly
affects the volume scaling input here. For an example of the measuring limits from 0 and
100 l, a volume of 50 l is yielded for process pressure of 1 bar.
The "Level" parameter setting also still automatically activates the device variable for the
mass. If you have not yet configured a value for the density, the initial value of 1 kg/l is
preset. With a value of 5 kg/l, a mass value of 250 kg is yielded in the example for the device
variable "Mass".
Note
When the density changes, the measuring range limits have to be adjusted accordingly.
You can carry out all parameter settings for the level block in SIMATIC PDM or in the HART
Communicator by activating the measurement type "Level" there. For all settings, the
measuring limits may be exceeded here as well by +/-20%. Values which lie above or below
that will be rejected by the device.
7.4.7

Measurement type "User"

Introduction
The "User" measurement type is the simplest of the measurement types that you can select
with the measurement type selector. Only one further device variable, "User", is activated
here in addition to the four standard device variables. The variables "Level", "Volume",
7-8
m Mass
p Pressure
V Volume
Operating Instructions, 06/2005, A5E00359579-02
SITRANS P300 with HART communication