The parallel-platecondenser type of containing wat er sensor for crude oil is used, so, the sensor is easily washed.
采用了平行板电容器式原油水份传感器，使得原油水份传感器便于清洗。
2
A parallel platecondenser with installation of drying air, lighting and charging is provided, which can keep charge numbers constant in demonstration experiment.
The magnetic field distribution produced by displacement current in charging circular parallel platecondenser is discussed by using the concept of magnetic potential.