MN301450 Rev A
11
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Maintenance
Step Eleven
GENERAL
The Switch-Pro™ level switch requires no periodic maintenance except to clean off any deposits or scaling from
the sensor tip, as necessary. It is the responsibility of the user to determine the appropriate maintenance
schedule, based on the specific characteristics of the application liquids.
CLEANING PROCEDURE
1. Power:
Make sure that all power to the sensor, controller and/or power supply is completely
disconnected.
2.
Sensor Removal:
Make sure that the liquid level is below the location of the sensor and the tank
is not pressurized.
Carefully, remove the sensor from the installation. Replace the sensor with a 3/4”
NPT plug to ensure that liquid does not leak out during this procedure.
Do not re-install the Switch-
Pro™ if the threads are damaged.
3. Cleaning the Sensor:
Use a soft bristle brush and mild detergent, carefully wash the Switch-Pro™ level
switch. Do not use harsh abrasives such as steel wool or sandpaper, which might damage the surface
sensor. Do not use incompatible solvents which may damage the sensor's PP, Ryton or PVDF plastic
body.
4. Sensor Installation:
Follow the appropriate steps of installation as outlined in the installation section of
this manual.
CURRENT TEST (SENSOR ONLY)
Use to verify if the sensor indicates a wet or dry
condition. A power supply (typically 12 to 28
VDC) and a multimeter [set to read current (mA)]
are required. This test uses only two wires (Red
and Black). The sensor draws 5 mA (ultrasonic)
or 8 mA (vibration) when it is dry, and 22 mA
when wet. The White and Green wires are not
used.
RELAY CONTACT TEST (SENSOR ONLY):
Used to verify if the relay contact is switching
between dry (open) and wet (closed). Test
requires Red wired to Positive (+) and Black
wired to Negative (-) on a 12 to 36 VDC power
supply. Check for continuity across Green and
White (open for dry and closed for wet).
Reversing Red and Black wires will result in a
closed when dry and open when wet condition.