23
5 Connecting to power supply
MINITRAC 31 • 4 … 20 mA/HART - four-wire
40447-EN-130430
Instruments with intrinsically safe current output
You can find detailed information on the explosion-protected versions
(Ex-ia, Ex-d) in the Ex-specific safety instructions. These safety
instructions are part of the scope of delivery and come with the Ex-
approved instruments.
1
1
24
/L
/N
PE
56
22
11
12
21
22
19
20
18
17
14
13
16
15
12
2
5
1
3
4
6
7
8
Fig. 12: Electronics and connection compartment (Ex-d) with instruments with
intrinsically safe current output
1 Voltage supply
2 Relay output
3 Signal input 4 … 20 mA (active sensor)
4 Switching input for NPN transistor
5 Switching input floating
6 Transistor output
7 Interface for sensor-sensor communication (MGC)
8 Setting the bus address for sensor-sensor communication (MGC)
2)
5 6 7 8
2
3
4
1
2
+
( )
(-)
1
Fig. 13: Adjustment and connection compartment (Ex-ia) with instruments with
intrinsically safe current output
1 Terminals for intrinsically safe signal output 4 … 20 mA/HART active (not
with 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
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
2)
MGC = Multi Gauge Communication
