Vega MINITRAC 31 Operating Instructions Manual page 28

5 Connecting to power supply
Electronics and connec-
tion compartment - In-
struments with intrinsi-
cally safe signal output
28
The contact is then no longer suitable for switching low-voltage
circuits.
Inductive loads also result from the connection to a PLC input or
output and/or in combination with long cables. It is imperative that you
take measures to extinguish sparks to protect the relay contact (e.g. Z
diode) or the transistor or 8/16 mA output.
Instruments with intrinsically safe signal 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.
/L
1
/N
PE
2
Fig. 17: Electronics and connection compartment (Ex-d) with instruments with
intrinsically safe signal 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 Simulation switch (1 = simulation on)
9 Setting the bus address for sensor-sensor communication (MGC)
MGC = Multi Gauge Communication
4)
9
8
7
6
4
3
MINITRAC 31 • Foundation Fieldbus
5
4)