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Differential Capacitive Label Sensor - LRD2100

Differential Capacitive Label Sensor

Strengths

Clear labels, Speed, Least expensive clear label sensor

Weaknesses

Metallic materials and inks.

Scores

Performance: 5/5
Materials: 3/5
Ease of Use: 4/5
Cost: 4/5
Reliability: 5/5

Resources

Label Sensor User Manuals

Adjusting Label Sensors

Complete Technical Details on the LRD2100 Clear Label Sensor

Description

Differential Capacitive Label Sensor Field

Differential capacitive sensors use two sensing elements to detect gaps. The sensor only triggers when there is a difference between the two sensing elements.

Differential capacitive sensors use two capacitive sensing elements to sense web thickness. The output of the two sensing elements are subtracted from each other so that the sensor only has an output when one sensor is over a label and the other is over a gap. The advantage of differential sensing is that small changes in distance between the sensing elements and the baseplate due to temperature shifts or vibration do not affect the sensor.

Metallic materials or inks look very "thick" to capacitive sensors. Because differential sensors trigger on differences of thickness between the two sensing elements, metallic artwork or text can cause the sensor to trigger many times as the artwork passes through the sensor. Differential sensors cannot be used when metallic materials or ink are used on the label or liner.

 

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