KROHNE DK 46-47-48-800 EN - Manual (Page 18)

4
ELECTRICAL CONNECTIONS
18
DK46 - DK800
www.krohne.com 05/2011 - 4000302403 MA DK46-800-R03-en
4.4 Minimum clearance between two limit switches
Where two limit switches are used in one device and also where meters with limit switches are in
close proximity of each other, minimum clearances must be maintained in order to avoid mutual
influence of the switches.
4.5 Switching performance
Limit switch NAMUR monostable:
Float outside limit switch: signal ≥3 mA
Float inside limit switch (centre): signal ≤1 mA
Limit switch NAMUR bistable:
Regardless of the position of the float: after passage 1 signal ≥3 mA
Prerequisite: the float is outside the limit switch.
Limit switch 3-wire limit switch (transistor)
Independent of the position of the float: after passage 2 signal ≤1 V
Prerequisite: the float is outside the limit switch.
Minimum
clearance NAMUR 2-wire transistor 3-wire
1 16mm 0,63" 45mm 1,77"
2 6mm 0,236" 30mm 1,18"
INFORMATION!
For proper initialisation following power up, the NAMUR bistable limit switches should pass
through each of 1 and 2 once.
MA_DK46_800_R03_en_302403_PRT.book Page 18 Thursday, May 19, 2011 8:26 AM