Measuring device of the surface level of liquid

摘要

A measuring device to measure the surface level of liquids comprises a pair of probes each having a conductive body and an isolated coating layer enclosing the conductive body in such a manner that onlya little portion of the body is exposed outside of the coating layer; and a measuring circuit connected to the pair of the probes. The measuring circuit is provided with a power source, an amplifier circuit and an alarm device. When the surface level of the liquid passes through the exposed portion of the body of the probes during measuring, the change of the electrical property between the pair of the probes will be magnified to actuate the alarm device.