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       HMD DC2000
Scanning Hot Metal Detector
Two Sensitivity Ranges:  400 C & 250 C
       HMD DC3000
  Loop Scanner
Description   Accessories
       The DC 3000 is a scanning detector, sensitive to the infrared radiation emitted by a hot   product.It is a self-contained detector consisting of:

        a case for the opto-electronics, air-purging system and electrical connection
        a cooling jacket with adjustable mounting stand

Its design and particularly its cast aluminum case make it a detector specially adapted to the
harsh environment of the steel industry
       Radiant Bar BR3000
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             The DC 3000 is a Hot Metal Detector with remote control of the sensitivity range, specially designed for heavy industry. The detector outputs a signal for use by a process controller.Selection of one of the two sensitivity ranges may be performed remotely. The "High Sensitivity" position enables detection of steel at temperatures as low as 250 C, as well as other less-emissive products.
            The sensitivity control allows the DC 3000 to be used for all Hot Metal Detection applicationsencountered in the steel industry.

            The DC 3000 is ideal for the detection of products rolled at lower temperatures (e.g. copper) or less-emissive products such as hafnium. It is perfectly adapted to applications where process changes result in important temperature variations (e.g. quenching) or variations in emissivity (e.g. special steels).
             Above all, and in certain cases it is critical, the DC 3000 allows the choice of sensitivity range to be left until commissioning.    
Working Principle  
1. Scanning system:
     The DC 3000 uses the well-known principle. The detection field is scanned by a rotating polygonal mirror. When the analytical beam of the sensor detects infrared radiation from a hot product within the scanned field, the reflection of that radiation by the mirror onto the measuring cell provides a signal which is processed and a logic state is output as long as the product is within the field scanned by the detector.
This principle benefits the DC 3000 with the following features:
A large vertically scanned detection field angle
A small horizontal field angle
        A very precisely defined analytical beam

2. Choice of photocell:
         The graph below shows a comparison of the spectral sensitivity characteristics for conventional photocells: Si and Ge and the photocell used for the DC 3000. This technology is the optimal solution and allows detection at temperatures as low as 250 C
An adjustable mounting stand.
A cooling jacket with embedded stainless steel cooling coil. The jacket, which is independent of the opto-electronic case, includes all the fluid supply connections. The independent jacket allows the detector to be demounted without first disconnecting the fluid supplies or changing the optical alignment.
          A protective hood, hinged for cleaning of the detector window, includes an air purging system    
and adjustable aperture shutters.    
          Direct sighting through the detector enables precise orientation.    
          The scanning angle (10, 30 or 50) is shown on the case.    

2. Electronic
          A photocell particularly suited to detection at low temperatures or
in the presence of water vapor.Remote control of two sensitivity ranges
          A 15-pin, plus earth, connector. The detector is supplied with the
mating connector mounted on a cable (standard length: 2 m).
          All the electronics on a single plug-in circuit board.
          A control panel beneath a protective hinged cover at the rear
of the detector providing:  
        – Viewfinder
        – "Test" push-button for simulation of a product
        – Two sensitivity adjustment potentiometers (one for each range)
        – A tri-color LED indicating:
          off: malfunction
          green: product absence
          red: product presence
          orange: signal saturated
3. Self monitoring Alarm
           monitoring of the internal temperature of the detector (maximum 55 C/130 F) indicating any fault in the cooling syste
           monitoring of the power supply and of the scanning

Automatic control of the sensitivity for different products and monitoring of the detection
circuitry providing an indication of:

           dirty aperture glass
           the position of the sensitivity range switch
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