6
u
If intrinsically safe units are connected to the intrinsically safe circuits of the
corresponding equipment, the respective upper limiting values consistent with
the explosion protection according to IEC/EN 60079-14 or IEC/EN 60079-25
must be observed (proof of intrinsic safety).
5 Electrical connection
NAMUR switch
Mechanical switch
Input circuit no.
1
2
3
1 2 3
4 5 6
1 2 3
4 5 6
1 2 3
4 5 6
10 kΩ
10 kΩ
400 Ω ≤ R ≤ 2 kΩ
1 2 3
4 5 6
Maximum permissible values of the control circuits in type of protection intrinsic
safety
Voltage
10.6 V
current
19.1 mA
Power
51 mW
External inductance
97 mH (IIC) / 390 mH (IIB)
External capacitance
2.32 µF (IIC) / 16.2 µF (IIB)
