KROHNE BM 26 BASIC-ADVANCED ATEX EN - Manual (Page 13)

LIMIT SWITCH
2
13
BM 26 BASIC/ADVANCED
www.krohne.com 12/2011 - 4000347102 - AD ATEX BM 26 Bas-Adv R02 en
2.3 Electrical connections
2.3.1 Ex i limit switches
• Use the electrical connection procedure in the Handbook.
• If possible, use galvanically-isolated equipment.
• Supply the Ex i equipment connected to the limit switch. Use only certified intrinsically-safe
equipment.
• Connect only to separate certified, intrinsically-safe circuits. Make sure that the electrical
circuit characteristics are not more than the values that follow:
Non-NAMUR limit switches: Maximum intrinsically-safe values for the electrical
circuit
• U
i
≤250 VAC/DC
• I
i
≤1 A
• P
i
≤60 VA/W
• C
i
≈0 nF
• L
i
=0 μH
NAMUR limit switches: Maximum intrinsically-safe values for the electrical circuit
• U
i
≤24 V
• I
i
≤0.1 A
• P
i
≤0.21 W
• C
i
≈0 nF
• L
i
=0 μH
2.4 Start-up
Do a start-up check:
• Does the information given on the nameplate agree with the application?
• Ex i applications:
Ex i applications: Ex i applications: Ex i applications: Are you using an intrinsically-safe barrier within the correct parameters?
For further data, refer to Ex i limit switches on page 13. The electrical circuit characteristics
must not be more than the maximum intrinsically-safe values.
• Is the terminal compartment correctly sealed?
DANGER!
Non-NAMUR limit switches:
Non-NAMUR limit switches: Non-NAMUR limit switches: Non-NAMUR limit switches: The power supply must be intrinsically safe.