MN301310 Rev A
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Maintenance
Step Seven
GENERAL
The switch may need to be cleaned periodically to prevent jamming or sticking. The mini-float has no
scheduled maintenance requirement, except to clean off any deposits or scaling from the switch as necessary.
It is the responsibility of the user to determine the appropriate maintenance schedule, based on the specific
characteristics of the application liquid.
CLEANING PROCEDURE
1. Power:
Make sure that all power to the switch, controller and/or power supply is completely
disconnected.
2. Switch removal:
If necessary, make sure that the tank is drained well below the switch prior to
removal. Carefully, remove the sensor from the installation. Remove the outer screen by pushing on the
screen and turning
it slightly to disconnect it from the buoyancy net connector so that the float is
exposed.
3. Cleaning the switch:
using a soft bristle brush and mild detergent, carefully wash the switch. Do not
use harsh abrasives such as steel wool or sandpaper that might damage the surface of the sensor. Do
not use incompatible solvents that may damage the sensor’s PP or PVDF plastic body. Take particular
care to remove any scaling from the float body and make sure that it moves freely.
4. Sensor installation:
Follow the appropriate steps of installation as outlined in the Installation section of
this manual.
TESTING THE INSTALLATION
1. Power:
Turn on power to the controller and/or power supply.
2. Immersing the switch:
Immerse the mini-float in its application liquid, by filling the tank up to the
switch
during preliminary testing is to hold a cup filled application liquid up to the switch’s tip.
3. Test:
With the switch being fluctuated between wet and dry states, the switch indicator light in the
controller should turn on and off. If the controller doesn’t have an input indicator,
a.
Use a voltmeter with a power supply in series to measure an open or closed circuit.
b.
Use an ohmmeter in series to measure an open or closed circuit.
4. Point of actuation:
Observe the point at which the rising or falling fluid level causes the switch to
change state and adjust the installation of the switch as necessary.
EXAMPLE
Test the LV20 or LH25 series with a Multimeter that is set to read Volts. When wired NO the meter will read 0
volts when dry and full voltage when wet.
