KROHNE VA 40-VA 45 EN - Manual (Page 19)

ELECTRICAL CONNECTIONS
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VA40 - VA45
www.krohne.com 09/2013 - 4000424402 MA VA40 45 R04 en
4.4 Minimum clearance between two ring initiators
Where two limit switches are in one device, and also where devices with ring limit switch are
arranged close together, minimum clearances must be maintained in order to avoid mutual
influence of the switches.
4.5 Switching performance ring-type limit switch
Limit switch 2-wire NAMUR monostable
Float outside limit switch: signal ≥3 mA
Float inside limit switch: signal ≤1 mA
Limit switch 2-wire NAMUR bistable
Independent of float position like transit 1: signal ≥3 mA
Precondition: The float is located outside the limit switch.
Limit switch 3-wire transistor bistable
ndependent of float position like transit 2: output Ua ≤1 VDC
Precondition: The float is located outside the limit switch.
Minimum clearance 2-wire NAMUR 3-wire transistor
1 16 mm 0,63" 45 mm 1,77"
MA_VA40_45_R04_en_424402_PRT.book Page 19 Monday, September 16, 2013 8:50 AM