These level transmitters use eye-safe, invisible, infrared laser pulses to measure the distance to the surface. The on-board microprocessor computes the distance by multiplying the known speed of light by the travel time of the laser pulse from the transmitter to the surface and back.
Thanks to the very little divergence (<0.3°) of the laser beams, accurate targeting is made easy even in vessels or silos that have internal structures. In addition, there is no interaction between the narrow beam and local structures or build-up on vessel walls, thus making measurements highly reliable even when there are changes in the environment. This eliminates the need for reconfiguration, prevents down-time, and reduces the lifetime cost.
Laser level transmitter used in bulk solids silo, tank with an agitator and liquid tank. Image Credit: ABB Level Measurement Products
The LLT100 is the most recent generation of laser level measurement transmitters. Riding on the success of the LM80, it incorporates a host of innovative technologies to specifically modify laser time-of-flight measurement according to the requirements of industrial applications.
Hence, the LLT100 can measure all solids or liquids, even transparent liquids, by using powerful signal processing, laser pulse control, and precise timing circuits. The level of liquids can be measured at up to 30 meters (100 feet) and the level of solids at up to 100 meters (330 feet). All of this comes in a 2-wire powered device!
The LLT100 is specially designed for challenging industrial environments and it offers continuous, non-contact level measurement capabilities for inventory management and process automation in industries such as aggregates, chemicals, mining, oil and gas, power, food and beverages, pharmaceutical, pulp and paper, and water and wastewater.
ABB laser level transmitters used in municipal wells to measure wastewater level. Image Credit: ABB Level Measurement Products
Lasers allow level monitoring measurement for a wide variety of dry bulk solids and liquids contained in vessels. They are capable of measuring through narrow gaps and down to the bottom of vessels. The lasers function in all types of storage vessels, including tanks, silos, hoppers, bunkers, and feed chutes.
As the concept of echo mapping is not needed for laser level measurement, it offers a maintenance-free and reliable measurement method for any application where build-up is formed on the walls of the vessel or when there are changes in the local environment.
Additionally, multiple laser level measurement products do not get in the way of each other, even when proximally placed together.
This information has been sourced, reviewed and adapted from materials provided by ABB Level Measurement Products.
ABB Level Measurement Products. (2019, November 11). Measuring Solids and Liquids with Industrial Laser Level Transmitters. AZoSensors.
ABB Level Measurement Products. “Measuring Solids and Liquids with Industrial Laser Level Transmitters”. AZoSensors. 21 November 2019. .
ABB Level Measurement Products. “Measuring Solids and Liquids with Industrial Laser Level Transmitters”.
ABB Level Measurement Products. 2019. Measuring Solids and Liquids with Industrial Laser Level Transmitters.
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Post time: Nov-22-2019