31570 6-Inch Photojet Edge Guide Sensor

GPE 31570 6-Inch Photojet Edge Guide Sensor
  • No Operator Adjustments: Sensors scan ±6 inches lateral displacement, web density has no effect on control

  • Reliability: No transistors or vacuum tubes ensure longer life

  • High Accuracy: Detects and guides web better than plus or minus 1/8" from center where extreme mean centerline accuracy is required

The Model 31570 Dynaguide Centerguide Sensor includes two 6-inch Photojet centerguide sensors. These sensing heads consist of a light source and photo-conductive cells. The light source is a 6-watt tubular fluorescent lamp that operates on 115 volts AC, 50/60 Hz.

The photoconductive cell is a cadmium sulfide strip 6 inches long. Its resistance varies with the amount of light falling on it. A pair of adjustable shutters in each photocell housing provides for electrically balancing the sensing heads on each side of the web.

The sensors are used with the Model 33130D Digital Amplifier, in which the sensors resistive web position signals are converted to a voltage signal to operate the moving coil of an electrohydraulic controller. The sensors photocells are supplied with a low-level (15V) DC voltage, this insures a long service life. The amplifier also contains an output voltmeter to aid in initial set-up and for continuous monitoring of sensors during operation.