SOR Single Point Ultrasonic Level Switch - Manual (Page 11)

Form 829 (08.13) ©SOR Inc. 11/16
Pump Logic Accessory — Models with PL near the end of the Model Number
Two point ultrasonic level switches with the PL accessory are supplied with a third PC
board that has a DPDT relay for pump logic control. This third board is factory wired to one
set of liquid level relay contacts on each sensor cavity PC board. (The unwired set of SPDT
Place jumper
over the pin
pair for the
action required.
Terminal Block
NC1 C1 NO1 NO2 C2 NC2 (Power)
PUMP
UP
PUMP
DOWN
PUMP
LOGIC
Pump
Mode
Sensor
Condition
Liquid Level Relay
Continuity Chart
NC1 C1 NO1 NO2 C2 NC2
Relay De-energized
Pump Up
Mode
NC1 C1 NO1 NO2 C2 NC2
Relay Energized
NC1 C1 NO1 NO2 C2 NC2
Relay Energized
Pump
Down
Mode
NC1 C1 NO1 NO2 C2 NC2
Relay De-energized
contacts on each sensor cavity PC board can
be used for High and Low level alarms or other
external devices.)
The DPDT Pump Logic Relay can be field set to
pump up or pump down according to the draw-
ing below. The two pump modes are details in
the drawings here.
PC Board Field Replacement — See page 14 for ordering information
Electrical power must be disconnected from explosion proof models before
the cover is removed. Failure to do so could result in severe personal injury
or substantial property damage.
A. Remove the electronics housing cover.
B. Note existing connections then disconnect all conductors from the PC board terminal
strips. Continue according to one or two point instructions:
One Point Sensors (711 or 721)

Remove the two screws to release the PC board bracket from the housing.

Slide the PC board straight up, then unplug the sensor cables from the PC board.

Slide the old PC board completely out of the housing.

Slide the new PC board into the PC board mounting slots.

Discharge the sensor per instructions on page 8.

Plug sensor cable A into J1 on the new PC board.

Plug sensor cable T into J2 on the new PC board.