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VUHZ A.S Mold level measurement is not sensitive to local meniscus disturbances, such as vortices caused by argon blowing, various types of waves, etc. Sensor's viewing field width is approx. 600 mm and sensor measures mean molten steel level at this section of the mold's width. Typical course of characteristic is shown in.
2.3 Electromagnetic sensor SH7-S10
The sensor has shape of prism. The sensor is made of stainless non-ferromagnetic steel. Two sensing coils are located symmetrically to the axis.
The sensor is fastened to the mold by means of sensor cover, which serves as a clamp and which protects the sensor as well. The sensor cover is screwed on to two special holders fixed to the water jacket – see chapter 4. The cable between sensor and pre-amplifier may consist of two parts. Flexible cable is firmly soldered to each sensor. On the mold top an intermediate connector coupling may be placed, which is connected with pre-amplifier by second part of the cable.
2.4 BASIC TECHNICAL DATA
Electromagnetic sensor SH7-S10
Measuring range: 20 to 160 mm below the top edge of the mold
Nominal range: 60 to 100 mm
Minimum mold level that can be indicated: 250 mm (= the lowest indicated level)
Minimum mold size: 100 x 600 mm; maximum – no limits.
Storing temperature for the sensor without water: 0°C to 60°C
Sensor is resistant against a short-time molten slag overflow.
Steel drops or coherent steel layer are not allowed on the surface of the sensor.
Sensor’s cable length: up to 10 m
Protection: sensor IP 56, connector on the cable IP 65 (in connected and locked position)
Dimensions: see Fig. 1.9
Mass: approx. 28 Kg incl. cable in a protective hose (conduit) and connector
Relative humidity: 100%
Preamplifier SH-P
Power supply: from evaluation unit
Dimensions: preamplifier is situated in a junction box – size 300 X 300 X 150 mm
Mass: approx. 7 kg
Protection: IP 55
Ambient temperature: -20 to + 60°C
Relative humidity: up to 90%
Evaluation unit SH-E
Output signal: 4 to 20 mA or 0 to 20 mA/500 ohms
VUHZ a.s.
Digital setting-up of the slope, e.g.: 4 mA = 160 mm, 20 mA = 20 mm