Questions and answers about liquid level measurement.
Level switch vs transmitter
What is the difference between a level switch and a level transmitter?
A switch will turn on or off at a predetermined liquid level, perhaps to protect a tank from overflowing or to maintain a minimum / maximum level in the tank. The switch output is typically either a voltage free contact or if it is an electronic switch, a fixed voltage e.g. 12 volts when ON and 0 volts when OFF.
A transmitter has a variable output signal, 4 to 20 milliamps current loop is the most common. e.g. level transmitter for a 10 metre high tank, will read 4mA if the tanks is empty, 12mA if half full and 20mA if full.
Liquid level measurement products
4-20mA Output Hydrostatic Level Transmitters & Sensors
LMP307 Submersible Level Transmitter
18.605 G Low Cost Submersible Diesel Fuel and Water Tank Level Sensor
Submersible Hydrostatic Level Sensors & Probes
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