VEGA FIBERTRAC 31 4 … 20 mA_HART - four-wire With SIL qualification - Manual (Page 23)

23
5 Connecting to power supply
FIBERTRAC 31 • 4 … 20 mA/HART - four-wire
43386-EN-131119
1 1
24
/L
/N
PE
56
22
11 12
21
22
19
20
18
17
14
13
16
15
12
2
1
44
3
Fig. 13: Electronics and connection compartment (Ex-d) with instruments with
intrinsically safe current output
1 Voltage supply
2 Relay output
3 Interface for sensor-sensor communication (MGC)
4 Setting the bus address for sensor-sensor communication (MGC) 4)
5 6 7 8
2
3
4
1 2 +
( ) (-)
1
Fig. 14: Adjustment and connection compartment (Ex-ia) with instruments with
intrinsically safe current output
1 Terminals for intrinsically safe signal output 8/16 mA/HART (Multidrop) ac-
tive (not on versions with Ex-d approval)
2 Contact pins for the display and adjustment module or interface adapter
3 Terminals for the external display and adjustment unit
4 Ground terminal
5.4 Connection - Summation
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.
Electronics and connec-
tion compartment - In-
struments with intrinsi-
cally safe current output
Adjustment and connec-
tion compartment - In-
struments with intrinsi-
cally safe current output
Electronics and connec-
tion compartment - sum-
mation
4) MGC = Multi Gauge Communication