Berthold castxpert LB 452, Operating Manual

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3 Product Description
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Rev. 04, 03/2015
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3.5 Radiometric Measurement System
3.5.1 Functional Principle
The measurement system functions on the principle of the radiometric measuring
method. Here, the weakening of gamma rays by fluid metal in the mould is used
in order to (Fig. 4, No. 1) measure the fill level in the mould.
The EVU evaluates the electrical signal generated by the GAMMAcast detector and
continually measures the fill level of the mould of a casting plant. Here, the fill
level of up to 4 strands can be individually measured at the same time.
Note
Notes for the use of casting powder
If casting powder is used for the casting process, note that the height
of the casting powder layer is partially measured via the mould level
of the measurement device. This means that the mould level appears
to be somewhat higher than that corresponding to the actual mould
level. The magnitude of this deviation depends on the height of the
casting powder layer, the bulk density of the casting powder (granu-
late has a lesser disruptive effect) and the casting format. The error is
constant and is only a few millimetres for a desired uniform allocation
of casting powder and lesser casting powder layer for metallurgical
reasons.