SENSOREN FÜR AUTOMATION Proxitron GmbH - Gärtnerstr. 10 - D-25335 Elmshorn - Tel. 04121/2621-0 - Fax. 04121/24404 - mail@proxitron.de R Infrared - Sensors
Angle of View,
Distance Ratio
The scanned surface diameter ( d )
increases with increasing distance
( s ). This distance relationship is
dependent on the angle of view ( a ).
Infrared-sensors detect the infrared
radiation emitted by hot materials and
transform it into an electrical signal.
Built-in optics to narrow the field of
view, combined with a predetermined
switching temperature, provide for a
wide range of applications. These
include precise location and
positioning of hot objects in, for
example, steel and rolling mills, forges
and foundries, and glass and ceramic
installations. Hot parts can be tracked
over distances of several metres,
flames monitored, or mould part
removal of hot objects checked.
The line includes compact versions
with integrated processing electronics
as well as models for ambient
temperature of up to +290 °C, with
fibre optic cable between the optics
and the electronics. All components
are housed in rugged stainless steel
and fully potted for protection against
moisture, steam, shock and vibration.
Optical filters protect against spurious
radiation.
The electrical versions are available
as 3-wire types for 10 - 55 V DC and
2-wire types for 20 - 260 V AC/DC.
Both versions are completely
protected against short circuit,
overload and polarity reversal. The
pulsing short-circuit protection with
high interference immunity provides
automatic reset after the fault is
removed. A built-in LED indicates the
operating condition. Connection is via
2 m POKT-Therm cable or rugged
connector with IP68 rating.
Changing Conditions of Operation
Increasing flexibility in production lines
requires highly adaptable
sensors.
.
Options + Accessories
Function Check:
An automatic or manual self-check is
effected by remote control.
Cooling Jacket:
Double-wall stainless steel casing for
water cooling.
Air connection:
For blowing compressed air to keep
the optics clean of dust, water vapour
and heat radiation.
Tube:
Accessories for limiting the field of
view, as protection from other
influencing factors.
Swivel Stand:
Accessory for simple mounting and
adjustment.
Electronic Aiming Device:
An LED chain for exact aiming at the
measuring surface. Recognizes safety
reserve in case of background
radiation.
Analogue Output:
0 - 10 V or 0 - 20 mA corresponding to
the object temperature between
400 - 950 °C.
OKD/OSD:
PIROS in painted aluminium
rectangular housing with clamp
connection for applications outside of
the harsh steel and rolling mill area.
LSA/LRA:
Light barriers in stainless steel
housings for steel and rolling mills,
e.g. for material tracking in an
annealing furnace.
Teach-In:
.
An
ideal application for PIROS with
adjustable and self-learning response
temperature. The
sensors can react to
changing object shapes or different
temperatures
A process-optimised algorithm allows
variable conditions
20
50
100
200
500
1000
2000
0,2 0,5 1 2 5 10
distance to object (s)
scanned surface diameter (d)
a = 0,5°
a = 1°
a = 2°
a = 7°
a = 25°
a = 67°
mm
m
Incomplete Coverage
Sometimes the field of view of the
PIROS is not entirely filled by the
object. In such cases the
sensor must
have a lower response temperature.
For example, if the object coverage is
only 40% (10%) use a version that is
50 K (160 K) more sensitive.
Surface Finish, Emissivity
Most of the applications described in
this brochure refer to materials having
a rough, black or oxidized surface. In
these cases the emissivity is nearly 1
and can thus be ignored. However, a
bright, specular surface with
emissivity of <0.1 renders any
noncontact measurement more
difficult.
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