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Clear Label Sensors

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Clear Label Sensor Selection Chart

Standard Clear Label Sensors down | Specialized Application Label Sensors down| Learn About Clear Label Sensors down

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Why are these clear label sensors better?

Standard Clear Label Sensors (specialized application label sensors below)

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lrd6110 clear label sensorLRD6300
8200 clear label sensorLRD8200 LRD2100 clear label sensorLRD2100 LionEye Label SensorLionEye2
Speed/Accuracy 4/4
Materials 4/4
Ease of Use 4/4
Low Cost 2/4
Speed/Accuracy 2/4
Materials 4/4
Ease of Use 4/4
Low Cost 1/4
Speed/Accuracy 4/4
Materials 2/4
Ease of Use 2/4
Low Cost 3/4
Speed/Accuracy 3/4
Materials 1/4
Ease of Use 3/4
Low Cost 4/4
Clear Labels  
Paper labels
Solid foil/metal labels  
Metallic artwork, printing or stamping   Nonclear
Splices Nonclear
Response Time
20 µs 125 µs 20 µs 50 µs
Maximum Switching Speed 10 kHz 1 kHz 10 kHz 10 kHz
Accuracy 0.05 mm 0.3 mm 0.05 mm 0.2 mm
Technology Capacitive Ultrasonic Capacitive Optical
Adjustments Button Button Screw Button
Bar Graph Display    
Selectable Light/Dark Switching Button Button Wired Wired
Wide Fork (3 mm / 0.12")      
NPN and PNP Outputs

Specialized Application Clear Label Sensors

  3100 clear label sensorLRD3100
Remote Head
3120 clear label sensorLRD3120
Remote Head
5100 tear tape sensorLRD5100
Clear Labels  
Paper labels  
Solid foil/metal labels No No No
Metallic artwork, printing or stamping No No No
Tear-Tape (Clear or colored)    
Response Time
20 µs 20 µs 20 µs
Maximum Switching Speed 10 kHz 10 kHz 10 kHz
Accuracy 0.2 mm 0.2 mm 0.2 mm
Remote Head Size 10x20x74 mm 14x18x24 mm  
Technology Capacitive Capacitive Capacitive
Adjustments Screw Screw Screw
Selectable Light/Dark Switching Wired Wired  
Separate Sensing Head for Small Spaces  
Multiple Vertical Mounting for slitters/rewinders      
NPN and PNP Outputs


Risk-Free Clear Label Sensors

Why are LRD Clear Label Sensors Better?

More Precise Than Optical Sensors (Eyes)

Tests prove it: Capacitive label sensors are the best performing

Optics-free sensing technology is at the heart of an LRD clear label sensor. They see labels regular "eyes" can't see — like clear labels on a clear liner! This improved technology also makes them faster and more precise - even on ordinary paper labels. More than 50,000 LRD label sensors installed across the globe testify to their accuracy and reliability.

Our clear label sensors use capacitive or ultrasonic technology so they have no sensitivity to color or contrast. The sensors are triggered by changes in thickness, not opacity or contrast.

Lion Precision clear label sensors are available from distributors all over the world, or you can buy them directly from Lion Precision, or buy them online:

Buy Clear Label Sensors online

Choosing A Clear Label Sensor

To choose the best label sensor for your application, see the label sensor selection chart above. For greater detail on selecting the right sensor for you, visit our dedicated clear label sensor website.

How A Clear Label Sensor Works

Capacitive Clear Label Sensing

Capacitive sensors use an electric field to sense the amount of material in the sensor. The electric field exists in the gap between a sensing element in the top of the sensor and the grounded baseplate of the sensor. Web material placed in that gap changes the way the electric field behaves — more material changes it more. The electronics in the clear label sensor can sense these changes in the electric field. Capacitive label sensors are the most precise label sensors on the market.

Differential Capacitive Clear Label Sensor — LRD2100, LRD3100

differential clear label sensorThe LRD2100, the world's first clear label sensor, uses differential sensing. This means there are two sensing elements in the top of the sensor creating electric fields to the baseplate. When a label is in the sensor, both electric fields behave the same. When a gap enters the sensor, one of the electric field over the gap changes but the other doesn't. The sensor electronics detect this difference and signal the presence of a label to the controller. This type of sensor only sees changes in thickness. For this reason, the sensor rarely needs adjustment because it doesn't care if the label is thick or thin — it only sees the changes.

Because of the way metallic materials interact with electric fields, if metallic artwork such as a foil logo enters the sensor, the sensor sees many differences between the two sensing elements as the artwork travels through the sensor. For this reason, labels using any metallic materials require a different sensing approach.

Single-Ended Capacitive Clear Label Sensor— LRD6300

single ended clear label sensorThe LRD6300 has only one sensing element. It measures the absolute thickness of the material in the sensor. This type of sensor is more likely to require an adjustment between different labels in order to set the initial thickness measurement. After that, the sensor triggers the controller when the thickness exceeds a certain point; this point is set to trigger when the additional label thickness is added to the liner thickness. Once the thickness exceeds the trip point, any metallic material is ignored by the sensor because it only makes the label look thicker, but the sensor has already triggered.

Ultrasonc Clear Label Sensor— LRD8200

ultrasonic clear label sensorUltrasonic sensing works much like single-ended capacitive sensing except instead of an electric field, it uses high-frequency sound energy. A transmitting transducer ("speaker") in the base of the sensor transmits sound to a receiving transducer ("microphone") in the top of the sensor. The label web reduces the amount of sound reaching the receiver. The thicker the web, the less sound at the receiver. The sensor electronics measure the sound pressure at the receiver and triggers the control when a label edge is detected. This technology has no sensitivity to metallic materials. This is the newest type of clear label sensor., but not necessarily the best. See or our Label Sensor Test Results for more details.


Clear Label Sensor Selection Chart

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