And it have put forward using the change of dielectric contant in the interface medium to survey the altitude between upper oil interface and lower ones . moreover this installment can show the oil quantity and moisture content curve in tank 装置能够实现储罐上界面(气油界面)和下界面(油水界面)的准确测量,并能显示出油罐中的储油量和原油含水率曲线。