Babbitt LS-2000 Level Switch - Manual (Page 2)

General Description
The LS2000 is a point switch that detects the presence or absence of material in a bin silo, tank or
other container. The basic unit is made up of a solid stainless steel probe attached to an explosion proof
housing. Inside the explosion proof housing are all calibration adjustments and sensing electronics.
The unit is calibrated in the absence of material and an internal relay changes state when material
is detected.
THEORY OF OPERATION
The LS2000 employs a radio frequency (RF) balanced impedence bridge circuit to detect if the
probe is in contact with the material that is to be sensed. When material is not in contact with the probe, the
bridge is balanced by turning the adjustment pot to find the threshold where the red L.E.D. goes out. When
material is in contact with the probe, the bridge comes unbalanced and the comparing circuit realizes the
change. This causes the relay to change state.
INSTALLATION
*CAUTION: ALL INSTALLATION AND WIRING MUST CONFORM TO NEC AND ALL
OTHER LOCAL ELECTRICAL CODES. TAKE SPECIAL CARE IN OBSERVING
HAZARDOUS AREA SAFETY PROCEDURES. WE ASSUME NO LIABILITY FOR
IMPROPERLY INSTALLED OR WIRED UNITS.
Inspection and Operation
After unpacking the LS2000 visually inspect the unit for any damages. Please advise the factory or your local
distributor of any damage.
Before installing the unit, a simple operational check can be performed.
On the bench, hook up the appropriate power to L1 and L2. The operating voltage of the LS2000 is marked on
the power supply board. Hold the unit so that the probe is not touching any surface and touch the probe.
When you touch the probe, the red led should come on. This simulates product touching the probe.
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