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The ENV120 Ultrasonic Sludge Blanket Level Meter manufactured by WESS, utilizes enhanced ultrasonic technology to measure the sludge interface level in various types of clarifiers, settling tanks and thickeners with superior accuracy and reliability. The instrument continuously provides the user with important information which includes numeric & graphic screens representing the distance to the blanket, an echo profile image to ensure correct configuration during commissioning and saved data analysis. Additional features such as ASF (Abnormal Signal Filter), allows elimination of irregular field noise which can result from moving structures intermittently obscuring the signal. The ENV120 technology additionally incorporates a compressed air cleaning system to maintain the sensor in optimum condition and guarantee maintenance-free measurement. Specially designed mounting kits are also available.



  • Continuous and real-time measurement
  • High temp. & chemical resistive sensor  
  • Implementation superior signal control and tracking algorithms
  • Light and heavy layer level measurement with dual frequencies
  • Apply abnormal signal filtering algorithm
  • Maximum 400 days data logging and monitoring
  • Automatic sensor cleaning guarantee maintenance free measurement
  • Wireless option avoids cabling cost
  • Free WESSWARE software enables field data analysis and menu setup
  • Provide portable ultrasonic sludge level meter

Ultrasonic Sludge Blanket Level Meter (ENV120 SERIES)

  • Fixed type – C1S (Controller)

    • Measuring Principle : Ultrasonic Echo Flight Time
    • Measuring Range : 0.35 ~ 10m
    • Resolution : 1cm
    • Measuring Pulse : 5~25times/sec.
    • Measuring Density : User programmable density (Heavy or Light)
    • Display : Graphic LCD (Interface level, Distance, Echo amp., Time, Current output, Trend, Temperature)
    • Accuracy : +/- 1% of F.S.
    • Operating Temp. : -20 ~ +70°C
    • Sensor Control : 1 Channel
    • Sensor Cleaning : Built-in automatic air-jet
    • Outputs : Current : 4~20mA, nom. Load 250Ω (load range : 100 ~ 750Ω) Relay : 3 SPDT(5A, 250VAC)
    • Digital: RS232(STD.), RS485, MODBUS(Option)
    • Power Supply : 100 ~ 240V AC, 50~60Hz, ≤6W(STD.), 20 ~ 30V DC(Option)
    • Enclosure Material : Polycarbonate
    • Dimension : 252(W) x 238(H) x 124(D)mm
    • Mounting : Hole center 152(W) x 236(H) mm (Ø8 x 4ea)
    • Weight : 2.2 kg IP Rating : IP67
    • Data Saving : Max. 400 days data logging and trend
    • Screen : Numeric, Echo profile, Data trend, Parameter
    • Certificate : CE
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