The difference for pressure sensor,transducer,transmitter,switch
Issuing time:2016-12-01 15:17
A pressure sensor is any device that measures pressure and converts it to an electrical signal. It’s an all-encompassing term that includes pressure transducers, transmitters, and switches (these will be defined below). All transducers, transmitters, and switches are sensors, but not all sensors are transducers, transmitters, or switches.
Pressure Transducer & Transmitter
Pressure transducers and pressure transmitters are very similar. A pressure transducer is an electromechanical device for translating pressure values into voltages across a high-impedance load (5,000 ohms or greater). A on the other hand translates pressure values into currents (generally 4-20 mA) across a low-impedance load. In general, transmitters are preferred when sending a signal over relatively long distances (i.e. over thousands of feet). Neither of which, however, can change or control pressure. These devices are soley for measuring pressure and communicating the output electronically or visually.
Unlike a transducer or transmitter that can translate all of the pressures in its range, a pressure switch will trigger at a specific set pressure. That set pressure can either be high or low and can either engage or disengage a circuit. These are commonly found in vehicles to indicate low engine oil pressure and in gas compressors with an automatic shut-off mechanism.