NORAC UC4+BC+HD5 Part 1 - Manual (Page 14)

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Arrange the ultrasonic serial numbers from lowest to highest, left to right. Apply a
light coating of the supplied Permatex Anti-seize grease to all threaded parts upon
installation.
Figure 9: Sensor Serial Number Installation Location (Pull-Type)
Figure 10: Sensor Serial Number Installation Location (Self-Propelled)