SOR Single Point Ultrasonic Level Switch - Manual (Page 10)

10/20 Form 771 (08.13) ©SOR Inc.
Model Number
Accessory Designator
I.S. CI, FI or AI Expf FM or CS Non-Agency (no match)
721  2-N-P9-G 5003-009 5003-010 5003-010
721  2-N-P9-C 5003-011 5003-012 5003-012
721  2-V-P9-C __ __ 5003-028
721  2-E-P9-C __ __ 5003-042
NOTE: When ordering replacements for remote units (R in the 4th position of the model
number), supply cable length information and serial number. Circuit boards are tuned
to remote cable length for optimum circuit performance.
CE Marked Units
In order to achieve the stated accuracy of +/-1mA, a shielded cable, cable gland and shield
beads must be used. SOR recommends using a shielded cable made of PVC insulation
around a tinned copper braid shield. (Olflex CY cable or equivalent.) Refer to illustrations
below for installation of shield beads.
Probe Wire Shield Bead
Short/Fat Bead
Long/Slender
Bead
2 Loops
Positive
Negative
Install end of bead as close
to cable gland as possible
2 Loops
Probe Wire Shield Bead

Discharge the sensor. Connect the center conductor and shell of sensor wire end as
shown on page 5. (See )

Connect the sensor plugs to the new board. The sensor wire (T) plugs into J2
(transmit). The sensor wire (A) plugs into J1 (receive).

Replace the two mounting screws into the plastic ring. These screws are self-tapping.
Do not overtighten.
Replacement Circuit Boards Match the characters of your model number with those
shown below to select the proper replacement board part number. Accessory
designators are located at the end of the model number in no particular order.