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Wood Chip Bin level applications in plants like that shown in Figure 1 have historically been implemented with Ultrasonic or Yo-Yo type level measurements. The low dielectric of the chips virtually eliminates radar level sensors.
Figure 1. Wood chip bin level applications
The issues with Yo-Yo’s in Wood Chip Bin applications include the following:
Issues with ultrasonic level transmitters in Wood Chip Bin applications:
The solution is an ABB LM80 Laser level transmitter laser pointer as shown in Figure 2.
Figure 2. LM80 laser level transmitter
The pointer enables the customer to choose the exact point where the level is to be measured. The concave/convex problem can be measured to eliminate false levels that are prevalent with ultrasonic level transmitters and Yo-Yo’s. The very bottom of the bin can be targeted enabling a reliable “Bin Empty” alarm during shutdowns. There are no moving parts and the bin shape does not have any impact on laser measurement.
ABB LM80 Lasers level transmitters have been successfully applied to the measurement of Wood Chip levels. Commonly a span from 1 to 3 m (2 to 10 ft) is used. The feeder is started and stopped on a high and low signal generated in the controls system.
Another benefit of the LM80 is the ability to locate and mount the units in locations easy to maintain (off to the side and at a distance from the top of the bin). This enables easy access in the event that adjustments to spans, outputs or checking of target and loop outputs are required or desired. The LM80 has been tested in both the surge and the main and bins.
Customers often put the first units on Surge Bins where maintaining the level in most critical. Wood chip bins can be found at Pulp and Paper facilities, wood panel manufacturers and power plants that have been converted to burn Biomass instead of coal.
ABB is a leader in power and automation technologies that enable utility and industry customers to improve performance while lowering environmental impact. The ABB Group of companies operates in around 100 countries and employs about 145,000 people.
This information has been sourced, reviewed and adapted from materials provided by ABB Analytical Measurements.
For more information on this source, please visit ABB Analytical Measurements.
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ABB Level Measurement Products. (2019, October 17). Wood Chip Bin Level Applications of Laser Level Transmitters. AZoSensors. Retrieved on July 23, 2022 from https://www.azosensors.com/article.aspx?ArticleID=259.
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ABB Level Measurement Products. 2019. Wood Chip Bin Level Applications of Laser Level Transmitters. AZoSensors, viewed 23 July 2022, https://www.azosensors.com/article.aspx?ArticleID=259.
does the LM80 have an 4-20ma output for level indication or is it a singe point measurement?
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