Level transmitters provide continuous level measurement over the range of the system rather than at a single point and produce an output signal that directly correlates to the level within a vessel. From depth and pressure, to float, radar, ultrasonic, and capacitive, these transmitters employ different technologies designed individually for specific level applications.
Level transmitters are used to determine the level of a certain bulk-solid or liquid at any given time. Level Transmitters are different to level switches, which only sound an alarm when the level of material reaches a predetermined level.
The working principle of capacitance type level transmitter is based on the change in electrical capacitance of a capacitor formed by the sensor, the dielectric material, and the vessel wall. It can sense material with a dielectric constant from 1.1(low) up to 88(high)
Capacitance level transmitters have following advantages: