The Land Aluminium Strip Thermometer System - AST is a unique infrared radiation thermometer with an intelligent dedicated processor and 'set up' unit.
AST has been specifically developed to provide the aluminium hot rolling industry with a solution to one of its most difficult problems - the accurate and reproducible measurement of temperature on bright, semi-finished, hot alloy strips.
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It is capable of providing more accurate measurement of temperature than either a single or dual ratio wavelength thermometer.
The AST is highly effective in the measurement of temperature at both entry and exit of the Finishing Mill, the 'Breakdown Mill' (Reversing Rougher) and at the Downcoiler.
The AST can be used to reduce re-annealing and finishing costs and improve process control.
The AST is used with the application dedicated LMG AR processor.
Benefits
Reduced re-annealing costs
Reduced finishing costs
AST can infer potential problems on preceding ‘Breakdown Mill’ operations, i.e. reduction in coolant
Improved process control
Accurate reliable temperature measurement +10°C/18°F after optimisation with supplied APCOS software
Improved accuracy over both single and dual wavelength thermometers
Features
Automatic ability to cope with varying alloy types and emissivities.
Accurate optimisation using dedicated ‘set-up’ unit.
APCOS software to automate system optimisation.
Highly reliable, drift-free measurement.
Emissivity independence after setting up complete.
The LMG AR Processor provides digital indication of temperature and current analog outputs, for connection to data recording or
mill control equipment. An optional Maths Function Card permits
mathematical comparisons to be made between thermometer
inputs. Results may be used to drive outputs to plant control system.
Supports RS232C and RS485 serial communications.
Applications
The AST is highly effective in the following mill locations:
Measurement at both entry and exit of the Finishing Mill
Measurement at the Breakdown Mill (Reversing Rougher)
Measurement at the Downcoiler
OPTIMISATION
As a result of experience gained
from many site trials and
installations, it has been found
that slight variations are required
in the temperature calculation
coefficient values, in order to
maximise the system accuracy at
each measurement point.
A unique feature of the AST
thermometer is the ability to
optimise each unit individually.
This may then improve the
measurement accuracy at each
location.
Optimisation requires a small
number of temperature
comparisons to be made on a
representative sample of product types, against the AST set-up unit.
Optimisation is performed using
APCOS (Application Processor
Configuration and Optimisation
Software), provided as standard with
the LMG AR processor. APCOS
processes data and submits a
relevant solution for the temperature
calculation.
SYSTEM SPECIFICATIONS
Thermometer type:
AST
Measurement range (specified):
Mill entry: 300 to 550°C/570 to 1100°F
Mill exit:: 250 to 400°C/500 to 750°F
Response time:
1s to 98%
Target size:
98mm/3.9 in at 2m/78.0in
Resolution:
2°C/4°F
Absolute accuracy:
Better than 10°C/18°F after optimisation (in application)
System output:
0 to 20mA or 4 to 20mA (nominal load resistance 500ohms, max load including wiring
600ohms)
Surface emissivity indication:
0 to 20mA covering emissivity
range 0.00 to 1.00
Nominal load resistance 500
ohms, max load including wiring
600ohms)
Alarm relays: contact rating 50V
a.c./ d.c. at 0.5A max
