MN301310 Rev A
9
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Electrical
Step Five
HORIZONTAL MINI-FLOAT LEVEL SWITCH (LH25 SERIES ONLY):
Normally Open Operation:
Normally Closed Operation:
Position the switch such that the float swings down
when the switch is dry. In the dry state, the float rests
in the lowest position and the circuit is open.
Position the switch such that the float rests on top of
the switch when the switch is dry. In the dry state, the
float rests on the switch and the circuit is closed.
As the switch becomes wet, the float becomes
buoyant and circuit closes.
As the switch becomes wet, the float becomes
buoyant and circuit opens.
CONTACT PROTECTION (REED SWITCH):
When current is interrupted, the inductance of the load generates a high frequency voltage that appears across
the switch contacts. If the voltage is large enough, it can cause arcing. Arcing can cause the contacts to weld
together resulting in unreliable switch performance. It is essential to protect the circuit by suppressing the
voltage to prevent arcing.
To accomplish this, use a diode for DC circuits and a resistor-capacitor network for AC circuits.
DC Contact Protection:
AC Contact Protection:
