Babbitt LS7000/2 Dual-Point Sensor - Manual (Page 4)

2. THEORY OF OPERATION
The LS7000/2 employs a radio frequency (RF) balanced impedance bridge circuit to detect the level of material
along the probe.
As fluid level rises along the probe, the output of the bridge changes proportionally to the fluid level. The
setpoint potentiometers determine at what level the circuit detects the low and high setpoints.
An on-board dip switch (S2) determines automatic fill or automatic empty operation. S1 determines the power-
on-reset mode if the level is between the two setpoints when power is interrupted to the unit.
3. 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.
A. Inspection
After unpacking the LS7000/2, visually inspect the unit for any damages.
Please advise the factory or your local distributor of any damage.
B. Physical Installation
1) The LS7000/2 is installed vertically into a vessel using a 1” NPT connection.
2) Always check for physical room around the location you have chosen to allow for installation. Allow 5 ½”
turning radius to screw the probe in, and clearance above for the length of the probe.
3) CAUTION: Always take the necessary safety precautions when cutting or welding in the coupling for the
LS7000/2.
a) Tag and lock out the electrical power to the equipment that services the vessel.
b) Check for explosion hazards before cutting or welding the mounting coupling for the LS7000/2.
4) Screw the LS7000/2 into the connection provided.
5) The LS7000/2 has a 1” NPT conduit entry. The wiring of these units should conform to the National
Electrical Code and any other city or company codes.
C. Removing the Electronics
1) To remove the sensing card, simply unplug it from the power supply card. When reinstalling, this card is
made so that it cannot be plugged in backwards.
2) To remove the power supply card you must:
a. Disconnect supply power at main power source
b. Remove sensing card
c. Disconnect
wires from terminal strip
d. Remove green grounding screw
e. Unplug blue antenna lead
f. Hold the top of the card guide and lift out
To reinstall, reverse the above procedure.
D. Typical Applications and Wiring Diagrams
1. LS7000/2 Terminal Layout Page 3
2. Power Supply Board and Sensing Card Page 4
3. Ladder Diagrams Page 5
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