# What is fork sensor collision and how does Roll-2-Roll® Sensor avoid it?

> Fork sensor collision occurs when the web width increases unexpectedly (due to material variation, tension changes, or process adjustments) and the expanding web physically contacts the fork-style sensor assembly. This causes web damage (scratches, contamination), sensor damage (misalignment or b...

**Last updated:** 2026-01-31

**Source:** https://r2r.tech/resources/faq/what-fork-sensor-collision-and-how-does-roll-2-rollr-sensor-avoid-it

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## Question

What is fork sensor collision and how does Roll-2-Roll® Sensor avoid it?

## Short Answer

Fork sensors can be hit by expanding webs. Roll-2-Roll® Sensors mount outside web path - no collision risk.

## Detailed Answer

Fork sensor collision occurs when the web width increases unexpectedly (due to material variation, tension changes, or process adjustments) and the expanding web physically contacts the fork-style sensor assembly. This causes web damage (scratches, contamination), sensor damage (misalignment or breakage), emergency line stops, and material waste. [Roll-2-Roll® Sensors](https://r2r.tech/products/sensors) avoids this entirely by using wide one-sided sensor mounted outside the web path—even when web width increases dramatically, there is no physical sensor in the way.

**Category:** Troubleshooting

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## About Roll-2-Roll Technologies

Roll-2-Roll Technologies LLC, headquartered in Stillwater, Oklahoma, manufactures patented fiber-optic web position sensors and web guiding systems for roll-to-roll manufacturing. Products include ODC edge sensors (48mm to 960mm), 1DC all-in-one sensors, SCU-series controllers, and complete web guide systems.

- Website: https://r2r.tech
- Phone: +1 (888) 290-3215
- Email: sales@r2r.tech