Hot Metal Detectors (HMD)Back to list ›

Scanning Hot Metal Detector with Laser Pointer
Rota-Sonde DC4000-L

  • Two sensitivity ranges : 400 °C and 230 °C
  • Laser pointer for easy alignment
  • Remote control of the sensitivity
  • Self-monitoring

 

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Scanning hot metal detector with 2 sensitivity ranges and laser pointer.

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Benefits

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  • Easy alignment of the sensor with integrated laser pointer
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  • Assured detection regardless of the transverse position of the product
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  • Precise detection thanks to the narrow lateral field
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  • Reliable detection even in the presence of steam or dust thanks to the small analysing beam
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  • Photosensitive cell that best suits application in rolling mills, despite scale and steam
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  • Very low maintenance, virtually nil in some cases
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Applications

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The Rota-Sonde DC4000-L is a scanning hot metal detector for continuous caster and rolling mill applications, offering two sensitivity ranges and two self-monitoring functions.
¨The "high sensitivity" range enables detection of steel product at a temperature as low as 230 °C.
¨In this way, the Rota-Sonde DC4000-L is convenient for all hot metal detection applications in the Steel Industry and its self-monitoring facility optimises preventive maintenance.

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Examples of applications

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The Rota-Sonde DC4000-L is perfectly suitable for all detection applications of low-temperature rolled product or low emissivity materials such as hafnium.
¨It is also convenient for applications where a change in the process or material leads to major variations in the temperature of the product or its emissivity, as after quenching, or for special steels, etc...

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If the apparent temperature of the material is uncertain during the design stage, the choice of the sensitivity range of the Rota-Sonde DC4000-L can be left to the time when it is commissioned.

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Presentation

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The Rota-Sonde DC4000-L is a scanning sensor, which is sensitive to the infrared radiation emitted by hot products.
¨It is a self-contained detector including :

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  • An optoelectronic case with a protecting hood of the viewing port and a connector.
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  • A cooling plate with an adjustable mounting stand.
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Because of its design and particularly its cast aluminium case, the Rota-Sonde DC4000-L is specially adapted for the harsh environment of the Steel Industry (shocks, vibrations, heat, vapour and dust).

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Operating principle

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1. Scanning system

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

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Because of the exclusive optical scanning principle, the Rota-Sonde DC4000-L offers the following advantages :

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

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2. Photosensitive cell

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The Rota-Sonde DC4000-L is fitted with a special photosensitive cell, the best compound for detection of metal, even at a temperature as low as 230 °C (455 °F).

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Mechanics

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The Rota-Sonde DC4000-L is enclosed in a sealed cast aluminium case.
¨A hood to protect 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.

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Electronics

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  • Sensitive photocell with a better detectivity factor at low temperatures and in the presence of water vapour.en-dc4000-l-009-800x600
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  • Two sensitivity ranges with remote selection.
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  • Laser pointer for easy alignment.
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  • Case mounting connector and mating connector fitted with high temperature cable.
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  • Plug-in circuit.
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  • Control panel behind a hinged cover and including :¨
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    • Two sensitivity setting potentiometers (one for each range).
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    • A TEST button to control a built-in lamp for simulation of the presence of hot product in the field and to switch on the laser pointer.
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    • A three-colour LED :
      ¨ Green      :     product absent
      ¨ Red          :     product present
      ¨ Orange   :     cell signal saturated
      ¨ Off           :     alarm
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Self monitoring functions

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In order to optimise preventive maintenance and to improve reliability, the Rota-Sonde DC4000-L offers self monitoring functions including :

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  • Monitoring of the excessive internal temperature (limit of 55 °C / 130 °F) indicating a fault in the cooling system.
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  • Monitoring of the photocell signal to indicate dirt on the window or incorrect sensitivity setting.
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  • Alarm indicating power supply or scanning defect.
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