SOR Single Point Ultrasonic Level Switch - Manual (Page 8)

8/20 Form 771 (08.13) ©SOR Inc.
Calibration and Function Test
No calibration is needed. Units are calibrated at the factory. No user adjustments are
required.
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.
TB2 Remote
Self-Test
Terminal Block
(Optional)
Yellow LED (Dry)
Red LED (Wet)
TB1 Loop Power
Terminal Block
SW1 Failure
Mode Switch
J1 Receive Jack
J2 Transmit Jack
Functional test can be done with or without a current meter. See for wiring
configuration. See for component location.

Connect power to the circuit board as shown in . If the sensor is dry, the yellow LED
will light. If using a current meter, the display should read 8 mA (± 1 mA).

Apply process liquid to the sensor. The yellow LED will turn off, and the red LED will
light. Current meter will read 16 mA (±1 mA).

With Failure Mode Switch (SW1) in the 5 mA position, disconnect one probe lead wire (J1
or J2). Both LED’s will turn off and the current meter will read 5 mA (±1 mA). Reconnect
the probe lead wire.

With Failure Mode Switch (SW1) in the 19 mA position, disconnect one probe lead wire
(J1 or J2). Both LEDs will light and the current meter will read 19 mA (±1 mA).
Reconnect the probe lead wire.

To test Remote Self-Test switch connections (non-intrinsically safe units only), use the
dry contact to simulate a probe failure for steps 3 and 4 instead of disconnecting the
probe lead wire.