Omega Vehicle Security LVP-51 Series - Manual (Page 14)

14
MAINTENANCE Step Seven
Checking the Point of Actuation: Raise the fluid level to the point
where the sensor sends a “wet” signal (Input LED will turn Amber on
OMEGA ENGINEERING controllers). The “dry” signal should be sent
when the fluid level is lowered (Input LED will turn Green on OMEGA
ENGINEERING controllers). The actual Point of Actuation (POA)
depends on many variables, including the thickness of the wall and the
dielectric value of the liquid. For example, thicker tank walls can raise
the POA while thinner walls could lower the POA.
If the POA needs to be changed, measure the distance and remount the
sensor in a new location.
Do not attempt to change the Point of Actuation by intentional
miscalibration.
If the sensor does not signal wet and dry reliably, it may be that:
 the dielectric constant of the application fluid is too low
 the tank wall is too thick for the application fluid
 there are static or other electrical charges in the fluid
 metal objects are within 6" of the sensor
 calibration was performed incorrectly
Try the calibration procedure again, after making corrections if possible. If the full and empty states are too
similar dielectrically, it may not be possible to use a capacitance sensor.
Testing the Sensor:
1. Power: Apply power to sensor, by connecting power to the controller and/or power supply.
2. Full condition: Fill the tank with the application liquid, by filling the tank up to the sensor’s point of
actuation.
3. Test: With the sensor being fluctuated between wet and dry states, use a multimeter to ensure that
the correct signals are being produced by the LVP‐51‐R level switch, or observe the sensor indicator
light in the controller.
4. Point of Actuation: Observe the point at which the rising or falling fluid level causes the sensor to
change state, and move the installation of the sensor if necessary.
Maintenance: The LVP‐51‐R level switch itself requires no periodic maintenance except cleaning as required.
However, periodically clean any coating or scaling on the tank wall the sensor is attached to and check the
calibration. It is the responsibility of the user to determine the appropriate maintenance schedule, based on
the specific characteristics of the application liquids. In addition, any dripping or condensation between the
sensor and the tank wall fitting may need to be periodically cleaned to maintain accuracy.