SOR Single Point Ultrasonic Level Switch User Manual
Page 12
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Form 829 (08.13) ©SOR Inc.
Reinstall the two screws to secure the PC board bracket to the housing.
Go to C.
Two Point Sensors (712 or 722)
Upper and lower sensor cavities are connected to dedicated PC Boards. The PC boards
are marked Upper and Lower to indicate which board belongs to which sensor. One or
both of the boards can be replaced.
To replace the Upper board:
Unscrew the three 1-1/2” #4 mounting screws which fasten the Upper board to the
housing mounting bracket. (Note spacer locations.) Unplug sensor cable A. If sensor
cable T is plugged into J2 on the Upper board, unplug it. If there is no connection to
J2 on the Upper board, skip step 4.
Discharge the sensor per instructions on page 8.
Plug sensor cable A into J1 on the new Upper PC board.
Plug sensor cable T into J2 on the new Upper PC board.
Restack the spacers and replace the three 1-1/2” #4 mounting screws.
Go to C.
To replace the Lower board:
Unscrew the three 1-1/2” #4 mounting screws which fasten the Lower board to the
housing mounting bracket. (Note spacer locations.) Unplug sensor cable B. If sensor
cable T is plugged into J2 on the Lower board, unplug it. If there is no connection to
J2 on the Lower board, skip step 4.
Discharge the sensor per instructions on page 8.
Plug sensor cable B into J1 on the new Lower PC board.
Plug sensor cable T into J2 on the new Lower PC board.
Restack the spacers and replace the three 1-1/2” #4 mounting screws.
Go to C.
C. Reconnect all conductors to the PC board terminal strips.
D. Replace the cover.
E. Restore power to supply and control circuits. Conduct functional test.