Electronic level sensor detects changes in buoyancy
Macro Sensors
The Magnetrol Digital E3 Modulevel Displacer Level Transmitter (photo) is a liquid level-measurement and control device for a variety of CPI applications. The electronic-displacer level-transmitter technology detects and converts changes in buoyancy force, caused by a change in liquid level, into a stable output signal. These forces act upon the spring-supported displacer, causing vertical motion at the core within the Macro Sensors’ linear variable differential transformer, says the company. As the core position changes with liquid level, voltages are induced across the secondary windings of the sensors. These signals are processed in the electronic circuitry and used to control the current in the 4–20-mA current loop. — Macro Sensors, Pennsauken, N.J.