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

Form 712 (05.13) ©SOR Inc. 11/12
Field Replacement - PC Board
Identical replacement printed circuit boards can be ordered by specifying the part number
from the spare parts table on page 12.
De-energize all supply and control conductors that enter the housing. Failure to disconnect
electrical power could result in severe personal injury and substantial plant damage from
ignition of hazardous atmosphere.

Remove the electronics housing cover.

Note existing connections, then disconnect all conductors from the PC board
terminal strip.

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 sensor crystals as shown on page 4. Failure to do so may damage the electronics.

Plug the sensor cables into J1 and J2 connectors on the new PC board. The sensor
will function properly regardless of orientation.

Reinstall the two screws to secure the PC board bracket to the housing.

Reconnect all conductors to the PC board terminal strips.
Replace the cover.
Restore power to supply and control circuits.
Troubleshooting
Symptom Possible Causes Solutions
No response
to liquid
level
No power to unit. Restore power. Check fuse(s).
Blown fuse. Replace fuse(s). (See page 12.)
One or both sensor cable(s)
unplugged from PC board.
Replace sensor cable plug(s)
according to the Field Repalcement
procedure. (See above.)
Internal or external damage to
sensor. Sensor damage can
be verified using sensor test
procedure. (See page 7.)
If sensor tests okay, replace
circuit board according to field
replacement procedure. (below)
Replace entire instument or contact
factory for replacement sensor. The
factory will request model and serial
numbers to provide replacement
sensor.