2
Accurate Sensors Technologies
AST
Chapter-2
Introduction
AST 450 G-2 are specially designed highly accurate digital pyrometers to provide high performance and low
maintenance of non contact temperature measurement in the glass industry. Sub-range or response time can be
preset ex-works or adjusted through software. This enables the instruments to be adapted to various measuring tasks.
The pyrometers have solid body in aluminum housing which provide high operation safety even in rough industrial
environment.
2.1 Special features of AST 450 G-2
Ÿ Two wire technique
Ÿ Highly accurate 0.3% of measured value
Ÿ Wide temperature range 600…..1800°C
Ÿ Analog output (4-20 mA)
Ÿ Fast response time: 250 msec Adjustable upto10sec.
Ÿ Adjustable emissivity from 0.05 to 1.00.
Ÿ Test current 12mA USB interface for parameter setting.
2.2 Application, Range and Working Principle
AST 450 G-2 is digital pyrometer based on two wire technique provides digital signal processing with simple
connections. Temperature measurement utilizes the fact that objects emit thermal radiation in an amount that directly
corresponds to their own temperature and surface emissivity. The pyrometer sensor detects the amount of infrared
radiation emitted by the measured object (target). This signal is digitally linear zed and converted into standard analog
output signal.
The applications in which AST 450G-2 pyrometers can be used:
Ÿ Liquid glass
Ÿ Furnace Crown
Ÿ Furnace sidewall
Ÿ Fore hearth
Ÿ Feeder
Additional applications are the measurement of brick works in regenerators and tank. Use of robust fiber optic cable
with instrument makes it suitable for application in an ambient temperature up to 250°C without cooling.
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