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Detection of hot and cold tubes at heat treatment​ (wet environment)​

Smart Radar Sensor for width measurement Hot Rolling Mills

Challenge

Heavy water spray during hardening and high heat from untreatedsupports pose a serious threat to nearby sensors, leading to frequentfailures.

Solution

  • Infrared light barrier placed before the hardening head detects tubesearly with minimal water exposure.
  • Staggered signal enables upstream detection, improving processcontrol and safety.
  • Inductive proximity switches mounted underneath supports, activatedonly after hardening to avoid heat damage.
  • Compact design ensures reliable performance in harsh environmentswith water and steam.

Specifications

  • Range 2500 m, adjustable
  • Ambient temperature -20 to +70 °C without cooling, up to +200 °C with cooling

    Inductive Proximity Switch, Features :
  • Aluminum housing 212 x 212 x 75
  • Rated operating distance (Sn) 100 mm
  • AC/DC 2 wire normally open

A light barrier made of transmitter and receiver was installed at furnace exit (red arrow), presence of tube inside the hardening head (blue arrow).

Suggested Products & Accessories

Through-beam light barrier

Inductive proximity switch

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