This gives the differential capacitance sensor excellent resistance to over pressure damage. Differential capacitance sensors are widely used for determining the level in a tank or vessel. Rosemount has a line of electronic pressure transmitters using differential capacitance sensors as the pressure sensing element.
A capacitance differential pressure transmitter is a type of pressure measurement device that uses the principle of capacitance to accurately measure the difference in pressure between two points in a system. It is commonly used in various industrial applications where precise pressure monitoring and control are required.
In modern electronic transmitters using the differential capacitance sensor technology, capacitive pressure measurement involves sensing the change in capacitance that results from the movement of a diaphragm.
The Capacitive pressure sensor operates on the principle that, if the sensing diaphragm between two capacitor plates is deformed by a differential pressure, an imbalance of capacitance will occur between itself and the two plates. This imbalance is detected in a capacitance bridge circuit and converted to a D.C. output current of 4 to 20 mA.
A classic example of a pressure instrument based on the differential capacitance sensor is the Rosemount model 1151 differential pressure transmitter, shown in assembled form in the following photograph:
Capacitive type pressure transmitter is differential pressure type sensor. Capacitive pressure transmitter works under the principle of differential capacitance. Capacitive pressure measurement involves sensing the change in capacitance that results from the movement of a diaphragm.