Logika Technologies

OB-VT – Optical Barrier Visible Through-Beam

The Logika Technologies through-beam Optical Barrier OB-VT is designed for automation of steel, aluminum, and other production lines characterized as having extreme industrial environments. The OB-VT is used to detect the presence of product throughout the steel making process or any area with an extreme environment, particularly around furnaces.

The OB-VT is a two-piece instrument comprised of an Emitter and a Receiver. The emitter contains a solid-state laser diode that penetrates dust, steam and high temperatures around reheat furnaces. The Receiver picks out the modulated light from the optical noise of the steel plant for reliable product detection. Both Emitter and Receiver have built-in water cooling and air purge capability.

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Applications

  • Slab / Billet / Bloom
  • Thin Slab / Tunnel Furnace
  • Thin Strip
  • Furnace Entrance
  • Furnace Exit
  • Hot Strip / Plate Mill
  • Long Products Rolling
  • Pipe and Tube
  • Wire / Rod
  • Heat Treatment Furnace
  • Forging
  • Cold Rolling
  • Galvanizing / Annealing Furnace

Features

  • Designed for harsh environments, using an IP66 enclosure
  • Built-in Air Purging and water (or optional air) cooling
  • Insensitivity to ambient light with anti-light jamming capability of 1000lux
  • Visible red laser to facilitate alignment
  • Status indicator lights, Signal strength indicator
  • Operates using an emitter and receiver.
  • Detects Hot and cold targets
  • Operates well in ambient light
  • For targets >30mm in diameter
  • Detection range up to 50 m.
  • Access to an experienced applications engineering support team (included with all Logika products)

Options

  • Custom length Power Cable
  • Thermally insulated reflective jacket for extending sensor life in extremely harsh conditions
  • Support Stand - Steel Construction

Specifications

Operating temp:
-25˚C to +70˚C (-13˚F to 158˚F). Use cooling above 45˚C (113˚F)
Power Input:
24 VDC, 110VAC, 220VAC @ 5W
Output:
Relay NO/NC @ 5A, Choice of PNP or NPN “S” type output @ 100mA
Response:
PNP/NPN = 1 ms, Relay Make = 7 ms and Break = 4 ms
Detect Range:
Up to 50m
Target object:
Opaque object larger than φ30mm
Emitter Source:
650nm red semi-conductor laser Peak output power 10 mW, Class IIIb
Cable:
2 meters (6.6’), Insulation 20MΩ, 500VDC, sensor end factory terminated connector. Custom lengths optionally available.
Housing:
Cast aluminum enclosure rated IP66
Size:
Emitter: 267 mm L x 178 mm H x 80 mm D (10.5” x 7” x 3.125”) Receiver: 254 mm L x 178 mm H x 80 mm D (10” x 7” x 3.125”)
Indicators:
Emitter/Receiver Green = Power on; Receiver: Red = target detect
Laser:
Visible red Class IIIb

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