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5Connectingtopowersupply

MINITRAC 31 • Foundation Fieldbus

41782-EN-211203

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nddetailedinformationontheexplosion-protectedversions

(Ex-ia,Ex-d)intheEx-specicsafetyinstructions.Thesesafety

instructionsarepartofthescopeofdeliveryandcomewiththeEx-

approved instruments.

2122 1920 18 17 14 1316 15 12

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oating

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)

Electronics and connec-

tion compartment - In-

struments with intrinsi-

cally safe signal output

MGC = Multi Gauge Communication

Vega MINITRAC 31 User Manual

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