Vega POINTRAC 31 Operating Instructions Manual page 21

Electronics and connec-
tion compartment - Ex-ia
approval
Adjustment and connec-
tion compartment - Ex-ia
approval
POINTRAC 31 • 8/16 mA/HART - four-wire
/L
1
/N
PE
2
Fig. 10: Electronics and connection compartment with instruments with intrinsi-
cally safe current output (Ex-ia approval)
1 Voltage supply
Relay output
2
3 Signal input 4 ... 20 mA
4 Switching input for NPN transistor
Switching input floating
5
6 Transistor output
Interface for sensor-sensor communication
7
8 Adjustment of bus address for sensor-sensor communication (MGC)
1
Fig. 11: Adjustment and connection compartment with instruments with intrinsi-
cally safe current output (Ex-ia approval)
1 Terminals for intrinsically safe signal output 8/16 mA/HART (Multidrop)
passive - not with versions with Ex-d approval
2 Contact pins for the indicating and adjustment module or interface adapter
Terminals for the external indicating and adjustment unit
3
Ground terminal
4
2) MGC = Multi Gauge Connection
5 Connecting to power supply
+
-
1
2 5 6 7 8
8
7
6
4
5
3
2)
2
3
4
21