KROHNE DK 46-47-48-800 EN - Manual (Page 16)

4
ELECTRICAL CONNECTIONS
16
DK46 - DK800
www.krohne.com 05/2011 - 4000302403 MA DK46-800-R03-en
4.2 Limit switch
The flowmeters can be equipped with a maximum of two limit switches. The switching function of
the limit switch can be designed as monostable or bistable.
Monostable function: Switching pulse as float passes through switching point,
independent of direction of movement.
Bistable function: Stable changeover as float passes through switching point.
Example (bistable): Float above limit: Output "High"
Float below limit: Output "Low"
For switching patterns and electrical connection values of different limit switches, see -
Technical Data - Limit Switches
Connection of limit switch - 2 wire NAMUR
1 Lower limit switch to terminal 1
2 Upper limit switch to terminal 2
The connection box includes an EMC filter unit.
Electrical connection limit switches - 2-wire NAMUR no terminal box
1 Limit switch (no terminal box)
2 Blue cable -
3 Brown cable +
4 External EMC filter
5 Receiver device
When connecting to an EMC filter, the ground terminal must be connected to the back rail of the
flowmeter.
Electrical connection limit switch - 3-wire (transistor)
bn - brown: supply voltage +
bk - black - switch
bu - blue: supply voltage -
MA_DK46_800_R03_en_302403_PRT.book Page 16 Thursday, May 19, 2011 8:26 AM