WIKA HIF - Manual (Page 7)

GB
WIKA Operating instructions magnetic operated float switches Model RSM and HIF 7
13333283.01 01/2010 GB/D/F
Use of magnetic float switches with inductive or capacitive
load may lead to the destruction of the reed switch. This
may cause a malfunction to the control circuitry and harm
to persons or goods.
With inductive load, magnetic switches have to be
connected to a RC Network (acc. to appendix).
With capacitive load, connecting cables longer than
50 m or connection to a PLC with capacitive input circuit,
a 22
Ω resp. 47 Ω (10 VA contacts) resistor is required to be
connected in series to limit current spikes. A 220 Ω resistor
shall be used when connected to an electronic timer.
Overloading the magnetic float switches may lead to
the destruction of the reed switch, which may cause a
malfunction to the control circuitry and harm to persons or
goods. The maximum switch capacity values given in the
chapter "Technical data" and the Technical bulletin must
not be exceeded.
4. Electrical connection