New Optical Pyrometer for Measuring the Temperature
of Aluminum Alloys

Dr. E. Glassman
3T – True temperature Technologies
Theradion Industrial Park, Misgav, Israel

1. INTRODUCTION
Improvement in the effectiveness and quality in the modern technological processes employed in the manufacture of aluminum and its alloys cannot be achieved unless the temperature can be measured to an accuracy of ± 0.5 – 1%.

AST \ 3T development is oriented for a product, which can be the new step in the quite tight market of Infrared non –contact optical thermometers (pyrometers). And the main goal, achieved by our team was development of the system which is able to reach high accuracy temperature measurement of objects with various optical properties.

Continuous Control of Thermodynamic Temperature in Extrusion, Rolling and Forging of Aluminum Alloys

Prepared by—Dr. E.D. Glazman, Chief Scientist, R. Goshen, T. Kornfeld, S. Levy,
H. Damir

ABSTRACT -  Dynamic nature of particles behavior in extrusion, rolling and forging of aluminum and its alloys almost totally rules out the possibility for contact thermometry under continuous control of thermodynamic temperature. The authors examined the basic potentialities of non-contact passive optical pyrometry for these processes. Method of optical pyrometry which provides for thermodynamic temperature measurement at unknown and varying emissivity in the range of 200-1000ºC with maximal tolerance of approximately 1% are presented in the report. Results of industrial use of designed pyrometry systems obtained over a period of years for aluminum and its alloys in extrusion in a number of large companies in the USA, Europe, Canada, Australia etc. are discussed

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Real Temperature Parameters For Isothermal Extrusion

Prepared By Boris Shtarker, Eduard Hodos, Ofer Yoely,
3t True Temperature Technologies, Misgav, Israel.

Abstract — The Main Parameters That Must Be Controlled For Isothermal Extrusion, And To Achieve The Optimum Metallurgical Properties In The Profile, Are The Taper Heating Of The Billet, The Die Exit Temperature, And The Temperature Of The Profile During Cooling.

This Paper Discusses Different Ways To Achieve Isothermal Extrusion, Including System Requirements And Different Methods Of Temperature Measurement.

Cement  industry :

Kiln Burning Zone: Cement kilns produce cement, the main ingredient is concrete. Here  calcium carbonate reacts with silica-bearing minerals to form a mixture of calcium silicates. Cement kilns are the heart of this production process: their capacity usually define the capacity of the cement plant. The cement kiln uses higher temperatures to form the clinker.
A rotary kiln is basically a long cylinder rotating about its axis. Cement kilns rotate once every minute or two. The kiln is inclined at a slight angle, the end with the burner being lower. The rotation of the kiln causes the raw meal to gradually pass along from where it enters at the cool end, to the hot end where it eventually drops out and cools.

Application of Pyrometer:

Measurement of the temperature in the kiln burning zone is vital for maintaining both product quality and kiln efficiency. A 2-colour (ratio) thermometer is used to overcome the inherent problems of dust etc. which obscure the thermometer sight path.
A two-color pyrometer (alternatively known as a ratio pyrometer) is a system which largely overcomes the problem of dusty atmosphere by using a specific arrangement. Radiation from the body is applied to separate sensors which are working with narrow-band filters, such that the two wavelengths are close together. Detectors sensitive to these wavelengths produce output voltages. The ratio of these outputs, can be shown to be a function of temperature and to be independent of the emissivity.
 
The theoretical basis of the two-color pyrometer is that the output is independent of emissivity because the emissivities at the two wavelengths are equal.

The pyrometer is normally focused on to the clinker, a 2 color pyrometer ensures that even in dusty condition when the visibility is limited, accurate temperature is displayed.

AST450C, is a 2 color pyrometer equipped with extra protection window, which protects the pyrometer from buffing of the kiln. Special water cooling and air purging jacket is provided for the protection of the pyrometer.

The pyrometer provides a continuous 4-20mA output for control of burner fuel and other critical parameter for the cement manufacturing process. The pyrometer also is equipped with a RS232 output for parameter setting and data logging.
 

Accurate Temperature Measurement In Aluminum Extrusion For Increases Productivity, Quality And  Energy Savings

By Tuvia Kornfeld - Former Managing Director of 3T - True Temperature Technologies Ltd.

With sales in Europe, the United States and the Far East, 3T - True Temperature Technologies, Ltd. enjoys a worldwide reputation for its unique pyrometers.  The Company has introduced a unique line of proprietary pyrometers that use a totally new approach for remote temperature measurement.   These proprietary pyrometers provide highly accurate, non-contact measurement of true target temperatures, regardless of target emissivity and intermediate conditions.

Unlike other pyrometers, these products are not sensitive to changes in emissivity or other target parameters and are not affected by the intermediate conditions between the pyrometer and the target.  As a result, 3T’s pyrometers are the only products available today capable of handling the unstable targets and intermediate conditions commonly found in the aluminum, steel and other metals industries while still indicating the target temperature to a high degree of accuracy.

Temperature Measurement Of Aluminium Billet And Bar In Forging Process

 Prepared by: Boris Shtarker and Ofer Yoely

Introduction

Temperature control plays an important role in any hot-working operation. Contact methods of measurement are often difficult as the probes tends to wear and maintenance of the probes can be time consuming and expensive. Non-contact measurement using infrared sensors has been tried many times but with only limited success on aluminum because of the low and variable emissivity. The 3T company in Israel has successfully developed an infra-red temperature measurement system that uses several different wavelengths and complex algorithms to accurately measure the temperature in the extrusion, forging, hot-rolling and casting of aluminum alloys.

The P3000 pyrometer joins the family of innovative products that have been developed by 3T - True Temperature Technologies for use in the aluminum forging industry.