Maintenance; Cleaning Procedure - ProMinent DULCOMETER PH-501 Assembly And Operating Instructions Manual

MAINTENANCE

General: The Switch Tek™ level switch requires no periodic maintenance except cleaning as required. 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 switch, controller and/or power supply is completely
disconnected.
2. Switch removal: In all through wall installations, make sure that the tank is drained well below the
sensor prior to removal. Carefully, remove the sensor from the installation.
3. Cleaning the switch: Use a soft bristle brush and mild detergent, carefully wash the Switch Tek™ 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, PFA, PVDF or Ryton
plastic body.
4. Sensor installation: Follow the appropriate steps of installation as outlined in the Installation section of
this manual.
Maintenance Output to LED (LZ12 Only):
To wire the maintenance output wire to an LED,
follow the wiring diagram below. The Yellow wire is
connected to the LED and a 2.2k resistor in series
and referenced back to the (+) of the power supply.
Sensor Power
[RED & BLK wires] / 36 VDC Max.
5 ±1mA Dry / 22 ±1mA Wet
18 of 20
Maintenance Output to PLC (LZ12 Only):
To wire the maintenance output wire to a PLC, follow
the wiring diagram below.
connected to the PLC input with a 10 k
parallel to the PLC input and the (+) of the power
supply.
Relay Rating
[GRN & WHT wires] / 60
VA
LO900002
The Yellow wire is
Maintenance Alarm
[YEL wire] / NPN Transistor / 10mA Max.
Step Eight
resistor
E-1274
Rev A