Accurate Sensors Technologies
2
Chapter - 2
Introduction
AST A250 / AST A450 FO PL is specially designed highly accurate digital single 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 Product key features Working Principle, Range & Application
AST A250 / AST A450 FO PL are highly accurate pyrometers 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 250°C to 2500°C.
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 linearize and converted into
standard analog & digital outputs.
AST A250 / AST A450 FO PL has a fast response time of 2msec. Pyrometer have RS-232, RS-485 & USB 2.0
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 up to 250°C.
The pyrometer temperature measurement method utilizes the fact that objects emit thermal radiation in an
amount that directly corresponds to their own temperature and surface emissivity.
The applications in which AST pyrometers can be used are:
üInduction heating
üAnnealing
üWelding
üForging
üSintering
üRolling mills
üRotary kilns
Standard Item supplied with AST A250 / AST A450 FO PL:
üAST pyrometer
üConnection cable 12-core (length - 5 m)
üDigital cable 3-core (length - 1.5 m)
üMono fiber optic cable (length - 2.5 m)
üOptical head
üAST software CD
üManual
üCertificate of calibration
14.50
44
M16 x 1.0
25
74.5
25
M25 x 1.5
118.00 mm
34.50 mm
Ø49.50 mm
Ø48.00 mm
Binder
Connector
SMA 905
¼” x 36
for FOC
AST A250 / AST A450 FO-PL
14.00 mm
