| 摘要 |
<p>A water percentage meter includes a test cell through which a petroleum stream will flow. The test cell has an outer shell which cooperates with a sensor probe to form a sensor capacitor with the petroleum stream as the dielectric, and a reference probe surrounded with dry oil as the dielectric to form a reference capacitor. A comparator network compares the capacitance of the sensor capacitor with the capacitance of the reference capacitor, and provides a signal representative of the capacitance difference. An output circuit provides an output representative of the water percentage in the petroleum stream in accordance with the signal from the comparator network. <IMAGE></p> |
