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4.1 Supply Voltage
The supply voltage can be 18 … 28 VDC. But it is to be taken into consideration, that the supply voltage
dictates the maximum load resistance.
With a supply voltage of:
…24 VDC the load resistance can be max. 500 Ohms.
…18 VDC the load resistance can be max. 200 Ohms.
Notice:
A Zener barrier reduces the max. possible load resistance. The resistance of the barrier is to be
taken into consideration when calculating the overall load resistance.
Notice:
Supply and signal current: In ignition protection type intrinsically safe Ex ib IIB
to connect in a certified safe circuit with the following limits:
Ui =
28 VDC
Ci
=
negligible
effective inner capacity
Ii
=
110 mA
Li
=
negligible
effective inner inductivity
Pi = 770 mW
