Rockwell Automation 873C Ultrasonic Sensors - Manual (Page 3)

Alignment
The sensor can be positioned accurately using the LED on its
end, which glows with an intensity proportional to the strength
of the echo. Align the device as described below:
1. Place the target in the desired sensing position.
2. Choose a sensor location such that the surface of the
target faces directly toward the sensor. The distance
between the target and the switch must be between 30cm
(11.8in) and 1m (39.4in).
3. Mount the sensor on a firm, stable surface or support.
4. Apply power to the sensor as described above.
5. Turn the potentiometer on the end of the sensor fully
clockwise. This will disable the analog model background
suppression or set the discrete switching model sensing
distance to maximum. Check that the LED turns on.
6. Adjust the angle of the sensor to maximize the brightness
of the LED.
7. (Analog model only) If the analog model is sensing objects
behind the desired target, turn the potentiometer on the
end of the sensor counter-clockwise to suppress the
background objects, but not so far that the sensor no
longer detects the target.
8. (Discrete switching model only) Adjust the potentiometer
on the discrete switching model counter-clockwise until the
LED turn off, then slowly clockwise until the LED turns
back on. The sensing distance is now set at the target
location.
Dimensions—mm (inches)
LED
95.0
(3.74)
117.0
(4.61)
30.0
(1.18)
12.0
(0.47)
Adjustment Potentiometer
Accessories
Description Part Number
Mounting Brackets
Right Angle 871A-BRN30
Clamp 871A-BP30
Tilt Swivel 60-2439
Conduit adaptors 871C-N31