SOR Single Point Ultrasonic Level Switch - Manual (Page 7)

Form 712 (05.13) ©SOR Inc. 7/12
Sensor Test Procedure (Applies to all models)

Disconnect a sensor cable from the PC board. Measure capacitance across the two
conductors of the sensor cable.
  Capacitance from 2,000 to 3,000 pf indicates circuit is okay. Plug the sensor cable
back into the PC board. Go to step 2.
  Capacitance lower than 2,000 pf or higher than 3,000 pf indicates circuit is bad.
Go to step 3.

Repeat step 1 for the other sensor cable.

A replacement sensor can be ordered from the factory or the SOR Representative in
your area. Required order information: model and serial numbers stamped on the
sensor nameplate.
Units in Hazardous Locations - Prior to calibration, make sure that the
work area is declassifi ed before removing the explosion proof cover to
calibrate the unit. Failure to do so could result in severe personal injury
or substantial property damage.
Time Delay (Models with OD or OF accessories only)
On and off delay timers are fixed to a customer specified constant. The timers are not field
adjustable.
On Delay Timer
On delay is an integral timer that starts when process liquid is detected in the sensor cavity.
If the liquid level falls before the On timer completes its cycle, the timer resets to zero and
waits for the sensor cavity to fill again. When the On timer completes its cycle, the Liquid
Level Relay changes state to indicate liquid has filled the sensor. Failsafe switch (page 6) is
included with the delay timer option.
Off Delay Timer
Off delay is an integral timer that starts when the process liquid evacuates the sensor
cavity. If the liquid level rises into the sensor cavity before the off timer completes its cycle,
the timer resets to zero and waits for the liquid to fall again. When the off timer completes
its cycle, the Liquid Level Relay changes state to indicate liquid has evacuated the sensor
cavity. Failsafe switch (page 6) is included with the delay timer option.