SENSORS |
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Hot Metal Detector |
ROTA-SONDE
DC 3000 |
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HMD
DC2000 |
Scanning Hot Metal Detector
Two Sensitivity Ranges:
400 C & 250 C
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HMD
DC3000 |
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Z3 |
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Loop
Scanner |
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TS2006 |
| Description |
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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
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Radiant
Bar BR3000 |
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| Application |
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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.
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). |
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all, and in certain cases it is critical,
the DC 3000 allows the choice of sensitivity
range to be left until commissioning. |
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| Working
Principle |
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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. |
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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 |
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| Features |
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1.Mechanical
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. |
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A protective hood, hinged for cleaning
of the detector window, includes an air purging
system |
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adjustable aperture shutters. |
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Direct sighting through the detector
enables precise orientation. |
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The scanning angle (10, 30 or 50) is
shown on the case. |
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2.
Electronic
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A photocell particularly suited
to detection at low temperatures or |
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in the presence of water vapor.Remote
control of two sensitivity ranges |
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A 15-pin, plus earth, connector.
The detector is supplied with the |
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connector mounted on a cable (standard
length: 2 m). |
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All the electronics on a single
plug-in circuit board. |
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A control panel beneath a protective
hinged cover at the rear |
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the detector providing: |
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Viewfinder |
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"Test" push-button for simulation
of a product |
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Two sensitivity adjustment potentiometers
(one for each range) |
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A tri-color LED indicating:
off:
malfunction
green:
product absence
red:
product presence
orange:
signal saturated |
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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
Control: 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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