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How to adjust a T-type fiber optic sensor

Adjusting a T-type fiber optic sensor involves positioning the fiber head, setting sensitivity, and using the teach function to optimize light reception and contrast.Step 1: Position the Fiber Head

Ensure the fiber head is correctly aligned with the target. If the sensor displays an error or insufficient contrast (often indicated by an "E" on the display), try angling or moving the fiber head closer or farther from the target to improve light reception differences between objects . Avoid bending the fiber below its minimum bend radius (typically around 60°) to prevent signal loss .

Step 2: Set Sensitivity

Adjust the sensor's sensitivity to detect the target reliably. Many T-type sensors have a LO/DO selector or potentiometer to set maximum scan sensitivity. Increasing sensitivity can help detect low-contrast objects, but excessive sensitivity may cause false triggers .

Step 3: Use the Teach Function

Most T-type sensors feature a teach button for automatic calibration:

  • Activate the sensor by pressing the teach button for the "ON" target for about 10 seconds.
  • Deactivate or teach the "OFF" target by pressing the teach button for the "OFF" target for 10 seconds.
  • Ensure the operation mode is set to "RUN" during teaching . This process allows the sensor to memorize the light levels for both target and background, improving detection reliability.
Step 4: Verify Contrast Margin

Check the contrast margin, which indicates the difference in light received between the target and background. A higher margin ensures more secure detection. If the margin is low, reposition the fiber or adjust sensitivity until the display shows an acceptable value .

Step 5: Additional Tips
  • Avoid interference: Keep fiber cables away from high-voltage lines or sources of electrical noise .
  • Clean the fiber tip: Use a dry cloth to remove dust or debris that may reduce light transmission .
  • Remote teaching: Some sensors allow programming multiple units via a remote teaching wire connected to ground or power supply . By carefully positioning the fiber, adjusting sensitivity, and using the teach function, a T-type fiber optic sensor can be optimized for accurate, reliable detection in various industrial environments .
How to adjust a T-type fiber optic sensor

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Technical note

This reference is intended for preliminary specialty-cable research. Compatibility, link budgets, fire performance, installation methods, test limits and applicable standards must be verified for the specific project.

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