The document discusses eddy current displacement sensors for measuring liquid aluminum levels. Key points: 1) Eddy current sensors are used to constantly monitor and maintain aluminum levels within 1mm in open mould furnaces, allowing for homogeneous casts. 2) The sensors can withstand temperatures up to 720°C and provide a temperature-stable output signal well-suited for this application. 3) Reasons for choosing this system include its ability to measure non-ferrous metals, large measuring ranges, robust sensors for harsh foundry environments, good temperature stability, and high operating temperatures.

1. A009_e
Eddy current displacement sensors
eddyNCDT
Liquid Aluminium Level Measurement
To obtain a homogeneous oxide-free aluminium Technical details:
cast, the aluminium level in the open mould must - Measuring range: 40 mm (80 mm)
be kept constant to within 1 mm or better. A - Accuracy: ± 0,08 mm (+ 0,16 mm)
constant level is achieved by controlled tilting of - Resolution: 4 µm ( 8 µm)
the furnace. The current level is measured and - Bandwidth: static to 30 Hz
monitored from above with air-cooled eddy
current sensors. A temperature-stable output Ambient conditions:
signal and the high operating temperature of the - Temperature: 720 °C
eddy current sensors are particularly significant - Medium: liquid aluminium
in this measurement.
Reasons for choosing the system:
- Eddy current systems work for non-ferromagnetic
metals as well as ferro-magnetic
- Large measuring ranges
- Robust sensors for harsh environments (foun-
dries)
- Good temperature stability
- High survival temperature
System configuration:
RS549 - 3 channel-bench top cabinet
DD500 - digital display
OS550 - oscillator
DL500.04 - demodulator
BC-U40-C6 - matching board
U40 - sensor
C6 - sensor cable
alternative:
BC-U80-C6 - matching board
U80 - sensor
C6 - sensor cable
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