DC Pressure Transducer Three Wire System Connection
A pressure transducer measures pressure. It uses a sensor capable of converting the pressure acting on it into electrical signals. These electrical signals are then relayed to controllers, where they are then processed and recorded. Pressure transducers use strain gauges to measure the force acting.
Pressure transducers require a power supply to produce electrical signals. The signal is commonly 4-20 mA or 0-10 V DC. Some systems may also use a combination of AC and DC power. The 4-20 mA signal is a widely used standard in the industry. It uses a 2-wire configuration while DC voltage output uses a 3-wire configuration. The 4-20 mA signal can be used over long distances and is less sensitive to interference than a DC signal.
Capacitance pressure transducer
Capacitance pressure transducers measure pressure by detecting the changes in electrical capacitance due to the movement of the diaphragm. It has two capacitor plates, a diaphragm, and an electrode fixed to an unpressurized surface. These plates are at a certain distance from each other, and the change in pressure will widen or narrow the gap between these plates. This change in capacitance is converted into a usable signal. Depending upon the application, this transducer can measure either absolute, gauge, or differential pressure.