VEGAPULS WL 61 Pulse Radar Sensor for Level Measurement of Water and Waste Water The VEGAPULS WL 61 is the ideal sensor for most applications in the water and waste water industry. It is particularly suitable for use in lift stations, pumping stations, wet wells, sludge tanks, chemical tanks, screening chambers, and flow measurement in open channels. The VEGAPULS WL 61 is an economical solution with versatile and simple mounting options. The flood-proof NEMA 6P housing ensures maintenance-free operation. Key Benefits Pulse Radar Ultrasonic Non-contact measurement + + High precision unaffected by temperature fluctuations, wind, fog, rain, and snowfall + - Measurement signal cuts through foam, sensor buildup, and condensation + - Submersible due to protection rating NEMA 6P (2 bar) + + Wear- and maintenance-free operation + - Extensive mounting options + + Advantages of Pulse Radar Measurement VEGAPULS WL 61 uses short radar pulses to measure the distance to the surface of the water. Because the signals propagate independently of the surrounding environment, the measurement is not influenced by fluctuating temperatures, wind, fog, rain, or snowfall. Its high precision remains unaffected under all operating conditions. This is a critical advantage, especially for flow rate measurement in open channels, since differences of even a few millimeters can cause significant measurement errors. The characteristics of the radar signal also allow the measurement to be unaffected by most types of foaming. This allows the VEGAPULS WL 61 to provide an accurate and reliable measurement in difficult waste water applications where foam is present, such as lift stations and sludge tanks. Since the VEGAPULS WL 61 radar signal is a microwave and not a sound wave such as ultrasonic, it is unaffected by any buildup or condensation on the sensor. This type of signal can also pass through plastic materials, ideal for external mounting of the VEGAPULS WL 61 on chemical tanks. This isolates the VEGAPULS WL 61 from the corrosive environment within the tank.
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VEGAPULS WL 61Pulse Radar Sensor for Level Measurement of Water and Waste Water
The VEGAPULS WL 61 is the ideal sensor for most applications in the water and waste water
industry. It is particularly suitable for use in lift stations, pumping stations, wet wells, sludge
tanks, chemical tanks, screening chambers, and flow measurement in open channels. The
VEGAPULS WL 61 is an economical solution with versatile and simple mounting options.
The flood-proof NEMA 6P housing ensures maintenance-free operation.
Key BenefitsPulse Radar Ultrasonic
Non-contact measurement + +
High precision unaffected by temperature fluctuations, wind, fog, rain, and snowfall + -
Measurement signal cuts through foam, sensor buildup, and condensation + -
Submersible due to protection rating NEMA 6P (2 bar) + +
Wear- and maintenance-free operation + -
Extensive mounting options + +
Advantages of Pulse Radar Measurement
VEGAPULS WL 61 uses short radar pulses to measure the distance to the surface of the water. Because the signals propagate independently of the surrounding environment, the measurement is not influenced by fluctuating temperatures, wind, fog, rain, or snowfall. Its high precision remains unaffected under all operating conditions. This is a critical advantage, especially for flow rate measurement in open channels, since differences of even a few millimeters can cause significant measurement errors.
The characteristics of the radar signal also allow the measurement to be unaffected by most types of foaming. This allows the VEGAPULS WL 61 to provide an accurate and reliable measurement in difficult waste water applications where foam is present, such as lift stations and sludge tanks.
Since the VEGAPULS WL 61 radar signal is a microwave and not a sound wave such as ultrasonic, it is unaffected by any buildup or condensation on the sensor. This type of signal can also pass through plastic materials, ideal for external mounting of the VEGAPULS WL 61 on chemical tanks. This isolates the VEGAPULS WL 61 from the corrosive environment within the tank.
Application Areas
Level Measurement for Control of
Screen Raking
Level Measurement in the Lift Station
The VEGAPULS WL 61 sensor measures how much water is in the catchment. Mounted over the inlet to the catchment, it measures the current level with high precision. The difference between the water level on each side of the screen indicates the degree of contamination of the screen and activates the rake or cleaning process.
The highly focused measuring signal of VEGAPULS WL 61 offers substantial advantages, especially in cramped spaces. The sensor works reliably, even if there is foam and buildup on the shaft walls.
▪ Non-contact measurement ▪ Measures through most waste water foam
▪ NEMA 6P fully submersible ▪ Pump control in conjunction with VEGAMET 391
VEGAPULS WL 61 is optimized for the varying applications in the water/waste water industry. The sensor’s large number of mounting options and different connection concepts combine for use in any of the typical application areas in this sector.
Flow Rate Measurement in
Open Channels
VEGAPULS WL 61 is the ideal sensor for flow rate measurement in open channels and at outfall weirs. Unaffected by temperature, wind, and weather, the radar sensor measures the actual flow with high precision.
▪ Independent of environmental influences ▪ Flow measurement in conjunction with VEGAMET 391
▪ Maintenance-free operation
m / h3 3
61 %
Level Measurement in a Sludge
Concentration Tank
Level Measurement in
Chemical Tanks
Before the sludge enters the digestion tower, it is stored in large vessels. During storage, the sludge is dewatered and thickened. Sometimes, scrapers and agitators are used to accelerate the process.
▪ Unaffected by large changes in temperature and humidity
▪ Immune to interferences related to buildup or condensation on sensor
▪ Measures through most types of waste water foam
Aggressive chemicals such as “alum” (aluminum sulfate) and “hypo” (sodium hypochlorite) are used throughout the waste water treatment process. The VEGAPULS WL 61 is an ideal solution to measure the level inside chemical storage tanks as the radar signal can travel through plastic materials.
▪ Non-intrusive measurement for plastic tanks
▪ Radar signal cuts through condensation and foam within tank
▪ Maintenance-free operation
Level Measurement of Rivers
and Canals
Due to its compact design, VEGAPULS WL 61 works particularly well for monitoring the levels of rivers, canals and lakes. The sensor can be easily mounted on existing structures such as bridges or sluices.
▪ Independent of environmental influences ▪ Unobtrusive design protects against vandalism
▪ Versatile mounting options
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Configuration
Due to the many different mounting options, VEGAPULS WL 61 can be easily integrated into any area of a facility. The installation options range from simple wall mounting to suspension from the sensor cable. Electrical connection of the sensor is just as simple and versatile.
VEGAPULS WL 61
Pulse radar sensor for continuous level measurement of liquids
▪ Measuring range up to 49 ft (15 m)
▪ High chemical resistance through PP antenna covers and connection cables with PUR insulation
▪ Approvals include ATEX, IEC, and CSA for USA and Canada
Output: 4 … 20 mA/HART, Profibus PA, or Foundation Fieldbus
Process Temperature: -40 … +176°F (-40 … +80°C)
Process Pressure: -14.5 … +29 psi (-1 … +2 bar)
Process Fitting: Threads Adapter Flange Mounting Strap
Material: Plastic horn antenna
Accuracy: ±2 mm
Direct connection to a control system
VEGAPULS WL 61 can be integrated into an existing control system in different ways depending on its configuration. Both analogue and digital sensor versions are available.
▪ Economical use of existing periphery ▪ Analog connection via 4 … 20 mA output with superimposed digital HART signal
▪ Digital connection via Profibus PA or Foundation Fieldbus
VEGAMET 391 – signal processing on site
The signal conditioning instrument VEGAMET 391 is the ideal solution for direct signal processing on site and for creating a redundant signal processing system. Up to 6 relays and selectable pump switching functions make direct control of complex systems possible without additional equipment.
▪ Simple adjustment and display directly on the signal conditioning instrument
▪ Integrated relay contacts for direct control of pumps or alarms ▪ Flow measurement with flow rate counter ▪ Data storage directly in the signal conditioning instrument
Simple integration into existing infrastructure
Regardless of how the measurement signals are to be further processed, VEGA can always provide a suitable solution for integrating the sensor into existing infrastructure. Whether analogue or digital, via an on-site signal conditioning instrument or with a PLC, VEGAPULS WL 61 offers all possible alternatives.
