Scanning Hot Metal Detector
Rota-Sonde DC2000

• Sensitivity 400 °C
• Remote control of the sensitivity
• Design for harsh environment

• Benefits
• Presentation
• Operating principle

• Photosensitive cell
• Mechanics
• Electronics

Benefits

• Easy alignment of the sensor.
• Assured detection regardless of the transverse position of the product.
• Precise detection thanks to the narrow lateral field.
• Reliable detection because of the small analysing beam.
• Photosensitive cell that best suits application in rolling mills, despite scale and steam.
• Very low maintenance, virtually nil in some cases.

Presentation

The Rota-Sonde DC2000 is a scanning sensor, which is sensitive to the infrared radiation emitted by hot products.

It is a self-contained detector including :

• An optoelectronic case with a protecting hood of the viewing port and a connector.
• A cooling plate with an adjustable mounting stand.

Because of its design and particularly its cast aluminium case, the Rota-Sonde DC2000 is specially adapted for the harsh environment of the Steel Industry (vibrations, heat, vapour and dust).

Operating principle

The detection field is scanned by a rotating polygonal mirror which reflects the infrared radiation from the product to the photocell

Because of the exclusive optical scanning principle, the Rota-Sonde DC2000 offers the following advantages :

• Easy alignment and reliable detection, regardless of the transverse position of the product, thanks to the large vertical field angle.
• Accurate detection because of the narrow lateral field.
• Reliable detection due to the small analysing beam.

All these features give accurate and reliable detection, whatever the dimensions and the temperature of the product, or its distance and its position in the scanned field.

Photosensitive cell

The Rota-Sonde DC2000 is fitted with a special photosensitive cell, the best compound for detection of metal, even at a temperature as low as 400 °C (750 °F).

Mechanics

The Rota-Sonde DC2000 is enclosed in a sealed cast aluminium case.

A hood for protecting the window glass is fitted with an air-jet facility to blow a vertical air curtain in front of this glass. The protective hood can be hinged down to clean the window.

The case is mounted on a cooling plate including a stainless steel pipe and fixed to a mounting stand, adjustable in two axes. The water and air purging connections are on the support plate. In this way it is possible to remove the sensor without first disconnecting the water and air supplies and without need of optical re-alignment.

Electronics

• Sensitive photocell with an optimal spectral sensitivity to detect product at low temperatures and in the presence of steam.
• Case mounting connector and mating connector fitted with high temperature cable.
• Plug-in circuit.
• Control panel behind a hinged cover and including :
  • A direct sighting through the detector itself for easy alignment.
  • One sensitivity potentiometers.
  • A TEST button to control a built-in lamp which simulates the presence of product in the field.
  • Product presence LED indicator.

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