KROHNE H54 M4 EN - Manual (Page 12)

12 H54 Installation and operating instructions
8 Limit switches
Description
The variable area flowmeter H54 can be equipped with
a maximum of two electronic limit switches.
The limit switch functions with a slot-type initiator (1) which is
operated inductively through a metal vane (2).
Contact types:
SC3,5-N0-Y 2-wire technology (NAMUR)
SJ3,5-SN 2-wire technology safety-oriented
SJ3,5-S1N 2-wire technology safety-oriented (inverted)
8.1 Electrical
connection
SC3,5-N0-Y, SJ3,5-SN, SJ3,5-S1N:
Limit switch Min
Terminal 1 -
Limit switch Min Terminal 2 +
Limit switch Max
Terminal 3 -
Limit switch Max Terminal 4 +
The label (1) shows the type of contact (1).
8.2 Setting
The limit switches K1 and K2 are set individually from each other
as normally open or normally close!
Lift the cam disk (2) and set the pointer at the switch point.
The metal vanes (3) are set via slipping clutch.
8.3
Technical data of limit switches
Technical data 2-wire 2-wire 2-wire
SC3,5-N0-Y SJ3,5-SN SJ3,5-S1N
NAMUR NAMUR NAMUR
Switching element function
NC contact NC contact NO contact
Nominal voltage U0 8 V 8V 8V
Power consumption:
Pointer vane not detected
≥ 3 mA ≥ 3 mA ≤ 1 mA
Pointer vane detected ≤ 1 mA ≤ 1 mA ≥ 3 mA
An isolating switching amplifier, e.g. Pepperl + Fuchs Series KF .. -SR2 ..., is required in order to operate the
SC3,5-N0-Y limit switch (refer to the chapter on the spare part list).
SJ3,5-SN and SJ3,5-S1N limit switches in 2-wire technology safety-oriented are connected to a safety-oriented
isolating switching amplifier, e.g. Pepperl & Fuchs K… –SH- ... (large S on the front)