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ALHS (Automatic Load-Height Sensor)

 November 7, 2014
There are several types of load height sensors that can be installed onto our stretch wrap machines.
PEPPERL+FUCHS
RLK31-8-2500-IR/31/115


PEPPERL+FUCHS
RLK28-8-H-2000-IR-Z/31/116

Diffuse Mode Sensor

This form of sensing is commonly referred to as the proximity mode. Light from the emitter strikes the target which causes it to become diffused at arbitrary angles. Some light returns directly to the receiver and the target is detected. Factors pertaining to the sensing range are color, size and finish of the target. The actual sensing range for each model is based upon a "white test card". The white card has a 90% reflectivity factor and is considered a "standard target". Darker colored or matte finished targets provide less reflectivity; therefore the sensitivity must be increased or the entire sensor must be positioned closer to the target.

There are various types of diffused mode sensing:

  • Diffused with background suppression: Diffused sensors with background suppression sensors have a defined sensing range for any object regardless of color, reflectivity or finish. They are able to detect dark objects placed directly on shiny backgrounds and can be easily installed and adjusted
  • Diffused with foreground suppression: Diffused sensors with foreground suppression sensors define a "dead-band" from the sensor's optical window. Objects falling inside this minimum sensing distance are ignored
  • Diffused with background evaluation: Diffused sensors with background evaluation only evaluate the light reflected by the background (i.e. the floor). If the sensor is not able to see the background, the output will change state. This is useful in applications with odd shaped targets where the user can not ensure light directed at the target will be reflected back to the sensors
Keyence
LR-TB2000C

Keyence
LR-TB5000C

Digital Laser Sensor

Using a laser enables long distance detection for difficult applications while maintaining a focused, visible beam spot. The method used to measure distance using a laser is referred to as TOF (Time of Flight).

The TOF method of detection measures distance by calculating the time it takes for a pulse-emitted beam to leave the sensor, hit the target, and then return to the sensor. This enables stable detection that is unaffected by the surface conditions of the workpiece that is being detected.

Read Keyence LR-T Series