2
AST A450C FO-PL is specially designed highly accurate digital two color pyrometer with fiber optic to provide high
performance and low maintenance of non contact temperature measurement in demanding industrial environment.
They are designed for areas with high ambient temperature (upto 250°C) without cooling or in areas where strong
electromagnetic interference can influence correct measurement because the fiber & optical head do not contain
any electronic part.
2.1 Application, Range and Working Principle
AST A450C FO-PL is highly accurate two color pyrometer with fiber optics especially designed for rough industrial
environment for temperature measurement of metals, ceramic or graphite. They are suitable for high temperature
measurement ranging from 800°C to 3200°C.
AST A450C FO-PL pyrometers are suitable for industrial purpose due to following advantages:
Ÿ Measurement of temperature is not affected by emissivity of object.
Ÿ Measurement of object temperature is possible where dust, moisture & other contaminants are present in
surrounding environment.
Ÿ The measuring object can be smaller than spot size.
Ÿ The pyrometer can be switched between 1-colour & 2-colour mode.
These pyrometers have solid body in stainless steel housing which provides high operation safety even in rough
industrial environment, and large variety of optics with fixed focus which can be easily used in all industrial areas. The
radiation from hot object is focused on the detector by optics which then travel into mono fiber cable with flexible
stainless steel protection tube and converted into electrical signals. This signal is then linearized and converted into
standard analog & digital outputs.
AST A450C FO-PL has a fast response time of 20msec. Pyrometers have RS-232 or RS-485 outputs. Response
time, emissivity, sub range and peak picker selection can be preset ex works or adjusted through available software.
According to application there are two optical heads small (head 1) & big (head 2).The heat radiation, enter from
optical head, to the lens system & travel through mono glass fiber with flexible stainless steel protection tube where it
is transmitted along to the converted .The optical head contains only the lens system, the electronic are located in the
converter box, so the measurement is possible in atmospheric condition upto 250°C.
Two color pyrometer involves measuring thermal radiance at two different wavelengths and inferring the
temperature from the ratio of these spectral radiance. Radiance ratio thermometers can be significantly more
accurate than single band thermometers in many applications.
The applications in which AST pyrometers can be used are:
ŸInduction heating
ŸAnnealing
ŸWelding
ŸForging
ŸSintering
ŸMelting
ŸRolling mills
ŸRotary kilns
34.50 mm
Ø49.50 mm
Ø48.00 mm
Binder
Connector
SMA 905
¼” x 36
for FOC
AST A450C FO-PL
14.00 mm
Chapter - 2
Introduction
M16 x 1.0
14.50
44
OH-I
25
74.5
25
M25 x 1.5
OH-II
