Products Level Transmitters

EchoSpan® LU80-84 Ultrasonic Level Transmitter



The general purpose ultrasonic level transmitter provides continuous level measurement up to 32.8' (10m) with a 4-20 mA signal output, and is configured via its integral push button display module. This non-contact liquid level sensor is ideally suited for corrosive, ultrapure, sticky or dirty liquids, and is broadly selected for bulk storage, day tank, lift station and process tank level applications.


Offered in 4 measurement ranges from 9.8' (3m) to 32.8' (10m)

Configuration is simple via integral push button display module

LCD display indicates level in inches, centimeters and percentages

Narrow 2" or 3" beam width for applications with limited measurement space

Fail-safe intelligence and diagnostic feedback for simple troubleshooting

PVDF transducer and NEMA 4X polycarbonate enclosure for corrosive liquids

Automatic temperature compensation for accurate measurement



Range: LU80: 4" to 9.8' (10cm to 3m)
LU81: 8" to 18.0' (20cm to 5.5m)
LU83: 8" to 26.2' (20cm to 8m)
LU84: 12" to 32.8' (30cm to 10m)
Accuracy: ± 0.2% of range
Resolution: LU80: 0.019" (0.5mm)
LU81/83: 0.039" (1mm)
LU84: 0.078" (2mm)
Dead band: LU80: 4" (10cm)
LU81/83: 8" (20cm)
LU84: 12" (30cm)
Beam width: LU80: 2" (5cm)
LU81/83/84: 3" (7.6cm)
Configuration: Push button
Memory: Non-volatile
Display type: LCD, 6-digit
Display units: Inch, cm and percent
Supply voltage: 12-28 VDC
Loop resist.: 500 Ohms @ 24 VDC
Signal output: 4-20 mA, two-wire
Signal invert: 4-20 mA, 20-4 mA
Signal fail-safe: 4mA, 20mA, 21mA, 22mA
or hold last
Process temp.: F: -4° to 140°
C: -20° to 60°
Temp. comp.: Automatic
Ambient temp.: F: -31° to 140°
C: -35° to 60°
Pressure: MWP = 30 psi (2 bar)
Enclosure rating: NEMA 4X (IP65)
Encl. material: Polycarbonate
Encl. hardware: Brass & stainless
Enclosure vent: Water tight membrane
Conduit entrance: Dual, 1/2" NPT
Trans. material: PVDF
Process mount: LU80: 1" NPT (1" G)
LU81/83/84: 2" NPT (2" G)
Mount gasket: Viton®
Classification: General purpose
Compliance: CE, RoHS
Activated Carbon Filtration Measurement

In the world demand for activated carbon, drinking water treatment ranks first. US demand for activated carbon is expected to grow 11.2% per year to almost $2.7 billion in 2017. Activated carbon is widely used for drinking waters purification, either in powder or in granular form. For many decades, this cost effective product has proved its ability to meet drinking water quality regulatory standards. The main treatment objectives for activated carbon are to absorb organic pollutants, such as pesticides, halogenated solvents and hydrocarbons, as well as the removal of oxidants, such as chlorine and ozone. Activated carbon is a carbonaceous material characterized by a well-developed pore structure, and a very large internal surface area and pore volume. At this water treatment facility, an EchoSpan LU80 is measuring water in a tank drawn from a reservoir that is being filtered by activated carbon. The carbon is constantly being agitated to prevent solidifying. The Echospan LU80 is installed on an open top stainless tank using a Flowline side mount bracket.
Click to view

Neutralization of Nanosized Phosphonic Acid

In 10 years, experts estimate there could be as many as 3.2 million knee replacement surgeries each year. Knee replacement surgery typically costs $45,000 - $70,000 at a typical hospital. On the high end that totals $22.4 billion a year in knee replacements. There are many benefits to knee replacement besides increasing mobility. The most important is an 11 percent lower risk of heart failure. And after seven years, their risk of dying for any reason was 50 percent lower. Knee replacements contain a metal and a plastic piece that work in unison to provide movement. The femoral component is made of a strong, highly-polished cobalt-chromium (Co-Cr) alloy and your kneecap will be replaced by a highly durable ultra-high-molecular-weight polyethylene (UHMWPE) plastic piece. The tibial component of your knee replacement is also made of UHMWPE and it may be held in place by a metal tray. The metal components must be polished prior to assembly to ensure a slick surface to slide seamlessly on the plastic component. In the polishing of Co-Cr, phosphonic acid self assembled monolayers (SAMs) are absorbed through chemical bonding with Co-Cr providing a smooth surface. This process reduces friction as well as the possiblity for a negative biological reaction that can be caused with a rough metal surface. Although the toxicity of phosphonic acid is low, due to it?s microscopic size it is more easily absorbed by nature. Therefore, these acids must be neutralized (pH =6-9) before they can be sent to a municipal wastewater facility or a receiving body of water. At this leading joint replacement manufacturer (SIC 3842; Orthopedic, Prosthetic, and Surgical Appliances and Supplies), an EchoSpan LU81-5001 is measuring the liquid levels of a tank containing sodium hydroxide (NaOH) that will be used to neutralize the phosphonic acid. The phosphonic acid is batched in with the sodium hydroxide and later mixed with wastewater from other processes to be sent to a municipal wastewater facility.
Click to view

Municipal Sump Level Measurement

In 2012, the global wastewater treatment industry will expand to $490 billion and grow 7% annually through 2015. Wastewater treatment employs chemicals, biological organisms and physical processes to produce environmentally safe water and solid waste. Environmentally safe water can be used by municipalities for sustainable landscape irrigation, returned to the water table or discharged into rivers and oceans. The most notable reuse of solid wastes comes in the form of fertilizer, while the remainder of solid waste is disposed at landfills. The first stop for wastewater at a treatment plant is the sump or lift station. This process is vital to the wastewater treatment process. Here, particulates are removed from the water in order to be neutralized, clarified and treated and returned to the environment or to consumers as reclaimed water. Accurate level measurement is vital, as any overflow of contaminants such as pharmaceuticals, acids and raw sewage may violate National Pollutant Discharge Elimination System (NPDES) permits resulting in significant fines. At this municipal waste water treatment facility, an EchoSpan LU83 is measuring a sump to prevent overflow after large particulates have been removed. The LU83 is also connected to a SCADA that allows for lift station pump control. As the water rises, it signals the lift station pump to emulsify and begin transferring the influent. This process is focused upon granulating particulates into suspension prior to the influent being disposed into the clarification tanks for sedimentation.
Click to view

Zoo Marine Life Water Level Measurement

AZA, Association of Zoos and Aquariums, gross $16.0 billion annually creating more than 142,000 jobs within the U.S. This industry has become one of the bright spots during the recession. Its market size has doubled from $8.6 billion dollars in 2008. More people now attend zoos and aquariums than sporting events in the U.S. In fact, 179 million guests visited 214 domestic and 15 international accredited zoos and aquariums. Flowline level sensors play a leading role in meeting visitors expectations to see their favorite exhibit by maintaining accurate level measurement at each exhibit. Any hiccup in performance can mean the difference in millions of dollars lost due to exhibit closures and thousands of upset customers. At this major U.S. zoo an EchoSpan transmitter is coupled with a DataView to monitor and control water level in a new 160,000 gallon exotic marine animal exhibit. The EchoSpan is installed on an external standpipe so that it is kept away from public view.
Click to view

Ship Water Ballast Level Measurement

Today, over 225 nations are active in trade resulting in over $9 trillion dollars in global business every year. About 90 percent of the world's goods are transported by ship. Bulk carriers, cargo ships and oil tankers are designed to transport enormous weight across vast bodies of water. When fully loaded, these vessels have no problem cutting through buffeting oceans and rocky seas. However, when all of its cargo has been off-loaded, new challenges are presented to keep the ships propeller immersed and hull steady. Adding ballast to a vessel lowers its center of gravity, and increases the draft of the vessel. A ballast tank can be filled or emptied in order to adjust the amount of ballast force. Ships designed for carrying large amounts of cargo must take on ballast water for proper stability when travelling with light loads and discharge water when heavily laden with cargo. On this geared bulk carrier an EchoSpan LU81 is measuring the level of ballast water in the upper ballast tank. As water is filled from outside the vessel the EchoSpan LU81, connected to a PLC, ensures that the ballasts are filled to optimum operating weight and evenly distributed to reduce stress on the hull structure.
Click to view

Automotive Battery Water Measurement

Global automotive battery sales are predicted to reach nearly $5 billion dollars in 2011 as new car sales are on pace to break 2007 records. In the United States alone, 99 million automotive batteries are produced each year for cars, trucks, golf carts, forklifts, heavy equipment, motorcycles and boats. With our society becoming more mobile every day, you can expect higher production numbers for years to come, particularly in emerging markets. At this facility, batteries are charged before final packaging and distribution. Large skids are filled with deionized water to prevent accidental overcharging and explosion. The deionized water is stored in a 5,000-gallon tank close to the charging skids. To monitor the liquid level of the tank, an EchoSpan LU83-5101 has been installed on a 4" diameter still well on the outside of the tank. As a redundant backup to the system, two non-intrusive LP50-6005 level switches are used as high and low alarms. The two LP50's are mounted to the outside wall of the 4" still well. The two LP50's and the EchoSpan LU83-5101 are connected to a local PLC interface for automation and control.
Click to view

Wastewater Sump Level Measurement

Sumps are used in municipal wastewater treatment facilities as a reservoir for water containing sediment, oils and other contaminants. These items must be removed prior to the clarification and chlorination processes. In the sump, heavy inorganics such as sand, gravel, seeds, and coffee grounds settle to the bottom by gravity. The wastewater then flows into the primary settling basins, where smaller particles settle out. Baffles act as a gatekeeper to prevent debris from moving to the next process; however, some debris may pass through. In the next stage mechanical devices skim off oil and solids that float to the top. The water that enters these sump tanks must be carefully monitored. An unexpected rise in water level can lead to solids passing over baffles. Falling water levels may also allow for oils to pass under the skimmers and into the clarification process. Continuous water level measurement and control is essential to maintaining a consistent flow rate. This ensures that water passing into clarification and chlorine tanks, and ultimately back to households, businesses or the environment is free of undesired waste. That is why this municipal facility chose the EchoSpan LU83. EchoSpan is perfect for wastewater applications dealing with continuous measurement that require reliability, repeatability and accuracy. By combining a DataView LI55 controller with EchoSpan, its capabilities can be further extended to automate pump control or monitor open channel measurement of influent / effluent with feedback to SCADA.
Click to view

Mississippi River Water Level Measurement

In the wake of Hurricane Katrina, one question asserted itself above all others, "Why did the levees fail?" In response to this question the U.S. Army Corps of Engineers embarked on a $14.6 billion program to improve the fortification of levees. As you may or may not know, the levee system acts as a retention pond or catch basin to protect the parishes or farm lands along the river from high water rising and/or flooding. The mission focused on the improvement of the systems that relieve pressure from the walls of the levee eliminating risk of a levee breach. The massive project includes restoring 350 miles of levees, storm-proofing 34 pump stations, and constructing new, elaborate surge barriers and pump stations. In all 251 (worth $6.7 billion) of the 361 contracts have been awarded and more than 70% of that money was awarded to companies located in Louisiana. The above pump station, located in southeast Louisiana, has chosen EchoSpan® to manage water level. As the river rises and overflows into the levee, high-volume pumps return water back to the Mississippi River. Each EchoSpan® is installed at the pump inlet on still wells that provide an undisturbed water surface for a precise level reading within +/- 0.019" resolution.
Click to view

Power Plant Wastewater Level Measurement

Wastewater management is a vital process in the production of electricity. Electric power plants are now held to the highest standards when it comes to water polution. For years, the EPA enforced strict benchmarks for measuring and emitting air pollution, but now water pollution has taken the lead as the most important environmental concern. The Flowline® EchoSpan® is perfect for applications dealing with storage of wastewater, especially those containing caustic and toxic by-products. EchoSpan's® sensor resolution and narrow beam width are key to monitoring liquid level and limiting the impact of overflow wastewater into lakes and streams. EchoSpan® provides the reliability and accuracy you need, all while maintaing a low operating cost.
Click to view

Aquarium with Stand Pipe Application

A large aquarium needed a measurement system for a concrete holding tank. They chose Flowline's EchoSpan? for thier level measurement based on its precision and reliability in large tank applications. Aquariums need to circulate water continuously and pumps that circulate the water within the tank can pose problems with level accuracy. Combining EchoSpan? with a PVC stand pipe can provide accurate measurement even in agitated conditions. This also allows for the measurement system to be kept outside the tank and concealed from public view.
Click to view

RV Wastewater Disposal Level Measurement

8.2 million recreational vehicles criss-cross the United States each year, visiting national parks and historic landmarks. The proper disposal of black and grey waste water from RV holding tanks is a matter of public and environmental safety. There are thousands of RV waste dumping stations, which allow the RV community to empty and clean their holding tanks. Here, an EchoSpan ultrasonic level sensor is installed over the bulk waste storage tank of a dumping station. The non-contact sensor reliably measures the waste water, and provides a continuous 4-20 mA signal to a controller.
Click to view

Semiconductor Acid Level Measurement

Semiconductor manufacturers use hydrofluoric, sulfuric, hydrochloric, nitric and phosphoric acids to etch their silicon wafers. The life blood of their process, these highly corrosive chemicals are notorious for damaging anything they contact including pumps, valves, heaters and sensors. Flowline's plastic non-contact ultrasonic level transmitters are the ideal measurement solution for this challenging environment. Here, an EchoSpan transmitter is installed in each 2500 gallon acid bulk storage tank.
Click to view

Municipal Lift Station Level Measurement

There are 200k US sewer pump lift stations that collect waste from residential, commercial and industrial sources, and automatically transfer it into our municipal wastewater treatment facilities. These stations are harsh environments that collect everything from human waste to trash, chemicals to grease, and particulates to solids. As a result, the maintenance or replacement of associated pumps and contact type level sensors is an ongoing challenge. Flowline's non-contact ultrasonic level transmitters and multi-point level switches are the solution, delivering reliable, maintenance-free level measurement or control in your municipal pump lift stations.
Click to view

Power Plant Sump Level Measurement

North American thermoelectric power plants use 225M gallons of water per day in their steam turbines and cooling towers. Most US plants are located in the Coastal and upper Mid West states with easy access to abundant ocean or lake resources. These facilities have lots of sumps that collect and pump transfer water into treatment for reuse or release to the environment. But sumps capture much more than water including grease, oil, chemical and trash, that coats everything in the pit. Here, an EchoSpan ultrasonic level transmitter is installed over the sump man-way. The patented digital signal processing technology features an industry leading 3" beam width that enables installation in close proximity to the ladder and side wall.
Click to view

Back Up System Fuel Level Measurement

In a major metropolitan city, a customer is measuring fuel levels for backup generators in a high rise building. Using Flowline's EchoSpan? ultrasonic transmitter, they are receiving continuous level measurement that informs the building maintenance crew of current fuel levels. The property management group is working with Homeland Security, who highly recommends they take better means in managing backup systems in case of emergency. Flowline is providing reliable, accurate and dependable level measurement, making sure the right amount of fuel is there when it's needed. It's backup system readiness made simple!
Click to view

Latex Bulk Tank Level Measurement

Largely concentrated in KY, LA and TX, the $5.7B US rubber manufacturing industry spends $300M per year in new capital equipment. Latex, the fastest growing industry segment, presents a storage and material handling challenge due to the extreme coating nature of the media. Flowline ultrasonic transmitters are the non-contact level measurement solution for latex bulk storage tank monitoring applications. It's latex level made simple!
Click to view

Water Theme Park Level Measurement

The World Water Park Association estimates that there will be 1300 water theme parks in the US by 2010. New park designs have become increasingly complex and automated with level as a primary measurement. Flowline ultrasonic transmitters are the non-contact level measurement solution for water theme park ride and exhibit monitoring applications. It's water park level made simple!
Click to view


P/N Description Price
LU80-5101 EchoSpan Level Transmitter, 3m (9.8'), 1" NPT $ 650.00
LU80-5161 EchoSpan Level Transmitter, 3m (9.8'), 1" G $ 655.00
LU81-5101 EchoSpan Level Transmitter, 5.5m (18.0'), 2" NPT $ 750.00
LU81-5161 EchoSpan Level Transmitter, 5.5m (18.0'), 2" G $ 755.00
LU83-5101 EchoSpan Level Transmitter, 8m (26.2'), 2" NPT $ 850.00
LU83-5161 EchoSpan Level Transmitter, 8m (26.2'), 2" G $ 855.00
LU84-5101 EchoSpan Level Transmitter, 10m (32.8'), 2" NPT $ 950.00
LU84-5161 EchoSpan Level Transmitter, 10m (32.8'), 2" G $ 955.00

USD list prices are subject to change without notice. Contact your Local Distributor for net price quotations.

Contact Us

10500 Humbolt Street
Los Alamitos, CA 90720 U.S.A.
T: (562) 598-3015


Get Level News

Receive your level application solutions