VEGA SOLITRAC 31 4 … 20 mA_HART - four-wire With SIL qualification - Manual (Page 14)

14
4 Mounting
SOLITRAC 31 • 4 … 20 mA/HART - four-wire
43387-EN-131119
To measure the level in very high vessels, multiple instruments can be
cascaded.
Cascading means that two or several instruments are connected
which can together cover a longer measuring range.
You can find the exact number of Slaves in the Safety Manual.
L1
L2
h
1
Fig. 4: Installation position - cascading arrangement
h Summed measuring range
L Measurement length (L1, L2)
1 Red marking line for designating the measuring range
Here, one instrument acts as a Master and all other instruments
operate as Summation Slaves. The pulse rates of all instruments
are summed in the Master instrument and converted into a common
signal.
If several sensors are cascaded, the measuring ranges of the indi-
vidual detectors must directly join each other. The detectors must also
slightly overlap.
Make sure that the red marking lines directly join the measuring range
of the next SOLITRAC 31.
Mount the SOLITRAC 31 in such a way that the detector tube is
directly in the radiated area of the source container. Mount the SOLI-
TRAC 31 preferably side by side and make sure that no detector tube
is hidden by another sensor.
Summation