Omega Vehicle Security LVP-51 Series - Manual (Page 13)

13
CALIBRATION Step Seven
After it is installed in place, the must be calibrated by the user before operation. Everything needed for the
procedure is self‐contained within the electronics of the LVP‐51‐R level switch. Two dielectric states—full
condition and empty condition—are measured by the LVP‐51‐R, and then averaged to set the threshold
between “wet” and “dry” at the sensor. The empty state must be at least 6" below the bottom of the sensor
for calibration. The full state must be to the top of the sensor (not just to the point of actuation) for
calibration. The actual application fluid at its intended operating temperature must be used during
calibration. Use the following procedure assumes that the sensor has already been wired to a power supply.
1. Remove the cap from the sensor body by loosening the two screws located below the sensor. Do not
remove the screws from the sensor. Insert a small screwdriver into the small slot at the edge of the cap
and gently pry upwards.
2. Looking down you will see a small three‐position switch and two trim pots marked Full and Empty. You
may start with whatever state the tank is in.
3. Full state: With the tank filled to the top of the sensor, set
the switch to the Full position (right). Make sure your hands
or any other objects are not touching the sensor while
calibrating because this will cause a false reading. Using a
small nonmetallic screwdriver or alignment tool, turn trim
pot Full until the LED just lights, and no farther. Note the
position. Now turn the trim pot back until the LED turns off.
The ideal setting for the trim pot is midway between these
on and off points.
4. Empty state: With the tank drained to a point no closer than 6 inches below the bottom of the sensor,
set the switch to the Empty position (left). Set the Empty trim pot as in Step 3.
5. After completing calibration, make sure to return the switch to the center position. Snap the cap back
on by pressing down, and tighten the two screws.