Label Sensors

Label Sensors FAQ

1. What is the overall registration accuracy?

Typical registration accuracy of LRD capacitive sensors is better than 0.02 mm. The LRD8200 ultrasonic sensor's accuracy is speed dependent. If accuracy is critical, use a capacitive sensor (LRD2100, LRD6110)

2. I have adjusted my LRD2100 or LRD3100 sensor and it doesn't work anymore - how do I start over?

Adjustments have a total range of 4 turns (LRD2100 and LRD3100). Center all adjustments by turning them four turns clockwise, then two turns counterclockwise. Then go through the setup procedure from the start.

3. How do I setup the sensor?

Setup for each sensor model is slightly different. View the manual for your model of sensor (acrobat pdf files):

LRD2100, LRD2100 w/connector,
LRD3100, LRD3100 w/connector,
LRD5100, LRD5100 w/connector,

4. LRD6100: I have a label with metal around the perimeter. What does the setup indicator look like during operation when properly setup?

Labels with metal area should have the LABEL adjustment set while sensing a nonmetallic part of the label. When properly adjusted the setup indicator will indicate LABEL during the nonmetallic part of the label, WEB during the gap between labels, and probably be all the way to the edge during the metallic portion.

5. LRD6110/6100: Why does the light on the bar graph move when I push on the sensor and does this relate to accuracy?

The amount of gap between the sensor and the baseplate is a critical part of the label measurement. When the sensor is pushed on, the gap is changed. This gap change effects the output. With a properly adjusted sensor, this does not effect accuracy. Avoid setting the LABEL adjustment to maximum to prevent any errors from this source.

6. Does the whole label have to be under the sensor?

No. But for best results, as much of the label as possible should be under the sensor. Labels smaller than the sensor area should be centered under the sensor area.

7. I have unpredictable, mistriggering of my sensor

Make sure the polarity select wire is connected to +Vin or ground. If this wire is unconnected, electrical noise can cause a mistrigger of the sensor. If it is connected, try changing it to the other connection (i.e. if it's grounded, connect it to +V).

If your sensor is an LRD2100, or LRD3100, metallic material in the label or the label printing media can cause extra triggers of the sensor. Metallic labels should be sensed with an LRD6110 or LRD8200.

8. What about splices ?

Because label sensors are also excellent splice sensors, web splices will affect the output of the sensor. The effect it has depends which label sensor is being used. For a complete discussion of splice, see our TechNote: Splices and Label Sensors .

9. Can I detect the location of a label on a container?

No, the sensor is designed to detect labels on a web as it passes through the sensor's gap.

10. Do I have to use the baseplate?

The 2100, 3100, 4100, 5100, 6110 sensors need a grounded reference surface behind the labels. The built-in base plate can be removed and another surface can provide this reference. The only requirements for the surface are that it be conductive, grounded, and within 0.25" from the sensor surface.

For the LRD6110, consistent gap is more critical to accuracy. If the original baseplate is not used, the substitute reference surface must provide a stable gap. Vibration or thermal growth relative to the sensor will introduce a potential error or require more frequent re-adjustment.

11. Are the outputs protected?

Outputs are short circuit protected. Voltages over 100V may exceed the protection capacity and damage the sensor.


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