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General Description
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:
Its design and particularly its cast aluminum case make it a detector
specially adapted to the harsh environment of the steel industry.
Applications
The DC 3000 is a Scanning 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 applications
encountered in the steel industry. Examples: 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.
Features.
Mechanical 
The Rota-Sonde DC3000 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.
 Electronic
- Sensitive photocell with a better detectivity factor
at low temperatures and in the presence of water vapour.
- Two sensitivity ranges with remote selection.
- Case mounting connector and mating connector fitted
with high temperature cable
- Control panel behind a hinged cover and including:
- Two sensitivity setting potentiometers (one for
each range).
- A TEST button to control a built-in lamp for simulation
of the presence of hot product in the field
- A three-colour LED: Green: product absent; Red:
product present; Orange: cell signal saturated; Off: alarm.
Self monitoring Alarm:
In order to optimise preventive maintenance and to improve reliability,
the Rota-Sonde DC 4000-L offers self monitoring functions including:
- Monitoring of the excessive internal temperature (limit
of 55 °C / 130 °F) indicating a fault in the cooling system.
- Monitoring of the photocell signal to indicate dirt
on the window or incorrect sensitivity setting.
- Alarm indicating power supply or scanning defect.
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