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MN301310 Rev A
Electrical
Step Five
VOLTAGE
The input voltage to the LV20 / LH25 mini-float switch should never exceed the maximum voltage rating.
FLOWLINE controllers have a built-in 13.5 VDC power supply which provides power to all of FLOWLINE’s
level switches. Alternate controllers and power supplies may also be used with the LV20 / LH25 mini-float
switch.
CABLE LENGTH
Determine the length of cable
required between the LV20 series mini-float switch and its point of termination.
Allow enough slack to ensure the easy installation, removal and/or maintenance of the sensor. The cable
length may be extended up to a maximum of 500 feet, using a well insulated, shielded wire.
SIGNAL OUTPUTS (NORMALLY OPEN VS NORMALLY CLOSED)
The LV20 series mini-float switch ships from the factory in the Normally Open (NO) configuration. The normal
state is when the float is resting on the bottom of the stem. An orientation mark will appear on the top of the
float when it is in the NO configuration. To switch the LV20 series from NO to NC configuration, follow the
steps below.
1. Remove the C-clip from the stem.
2. Remove the float and invert the float 180° whereby the orientation mark is now on the bottom.
3. Return the float to the stem.
4. Replace the C-clip.
VERTICAL MINI-FLOAT LEVEL SWITCH (LV20 SERIES ONLY):
Normally Open Operation
:
Normally Closed Operation
:
Orientation mark on the top of the float. In the dry
state, the float rests on the bottom of the stem and the
circuit is open.
Orientation mark on the bottom of the float. In the dry
state, the float rests on the bottom of the stem 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.
