31530 Photoelectric Line Guide Sensor

The Model 31530 Line Guide Sensor is designed primarily for photoelectrically sensing the lateral position of a line or abrupt color contrast on web material of an opaque or transparent quality. This information is transmitted electrically to a hydraulic controller for final control action. 

The Model 31530 is used exclusively with the Dynaguide* Hydraulic Controller and requires a separate transistorized amplifier, the Model 33130D Digital Controller.



Principle of Operation
The Model 31530 Line Guide Sensor (used with Dynaguide) continuously senses the line position with a reflected light beam. The sensor uses a photoresistive cell whose resistance is determined by the amount of light reflected by the line and web surface to its photoconductive surface. Change in resistance controls the input signal to the transistorized amplifier. The amplifier provides an output (in direct proportion to the lateral position of the web) to the Dynaguide controller, which in turn provides a proportional flow to the final control element.


  • High Sensitivity: Detects better than .002 inches of lateral web displacement

  • High Accuracy: Maximum gain over a proportioned range plus high speed response with stability from hydraulic controller, provides the most accurate guiding system available

  • Simplified Installation: Pre-wired sensor requires only a connection to controller. Compact size allows installation in confined areas

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