VUHZ液位传感器1

美

捷克VUHZ A.S公司，其前生是捷克钢铁研究院，改制之后成为VUHZ A.S，是连铸机结晶液位系统制造商，科技水平,突破了传统的检测系统的局限, 传统的检测系统一般采用Co一60或浮球检测系统。其中Co—60检测虽然精度高，但其具有放射性，需要人员保管和使用，安全性不高。而浮球是采用耐材制造的，会受到钢水的侵蚀，需定期人为更换和预热，增加操作人员的劳动强度和中断整个控制系统降低铸机的效率。VUHZ公司电磁感应式传感器，测量范围为0～160mm。VUHZ传感器安装在结晶器的顶部。冷却系统采用直接用铸机的一次冷却水闭环冷却，几乎不用另增设备。
VUHZ A.S结晶液位系统是由前端的液位传感器，中端的信号放大器及尾端的信号处理器组成。液位传感器感应到钢水液位后，通过连接电缆，把信号传输到信号放大器，信号放大以后，再把信号传输到信号处理器，信号处理器收到信号后经过分析处理，对连铸机的生产过程作出。

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: 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