Ultrasonic Sludge Blanket Monitoring System

The ENV100 Ultrasonic Sludge Blanket Level Meter, utilises 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 and 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 ENV100 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
  • 4 Sensors Measurement with One Controller Enables Economic Operation
  • Maximum 400 Days Data Logging and Monitoring
  • Wireless Option Avoids Cabling Cost
  • Automatic Sensor Cleaning Guarantee Maintenance-free Measurement
  • Built-in Unique Algorithm Eliminates Stationary and Moving Structures
  • Free WESSWARE Software Enables Field Data Analysis and Menu Setup


PROBE: Do not inflict impact or unnecessary external force on the probe during handling. The ultrasonic head, which transmits and receives sound waves, should be handled with extra care and stored wrapped in sponge or other soft materials to absorb the impact of an external blow. Attach and secure the probe using the 3/4” PF male thread located on the upper section of the probe. Pipe length selection should be based on the lowest liquid level. The pipe’s material should be chosen in consideration for material strength or application fluid characteristics. STS 304 20A, 10S pipe is the preferred choice in most applications. The cleaning air supply tube connects to the probe’s one- touch fitting only if the cleaning device is used. Position the probe at a location where the ultrasonic signal from the bottom of the pool or tank is not blocked by surrounding structures (agitator, pipe, etc.). Additionally, to ensure stable measurement, the probe should be positioned away from air bubbles and active floating solids resulting from sudden changes in velocity. For tank or rectangular pool applications, maintain at least 1m of separation distance from the wall to minimize interference and try to avoid a hopper area where the shape of sludge blanket varies upon pumping activity.

CONTROLLER: Protect the controller from impact and unnecessary external force until it is installed. Install the controller on a panel/handrail or wall using the mounting holes (Φ 8) located at the back of controller. Schematic diagram for u-bolt installation on a handrail. Located on the bottom of the controller are four cable glands the user can use selectively for his/her specific application. Each cable gland should be connected using a cable of correct diameter (Φ 4.5 ~ 10mm) to ensure IP67. Most products generally use the direct cable connection method, in which stripped wires connect directly to a terminal block (TB). This makes for a difficult wiring process because of the sheer number of wires in a confined space. ENV100, on the other hand, utilizes a new wiring method that uses an additional plug connector for the primary wiring and then it connects to TB stationed on PCB.


POWER REQUIREMENTS: AC 100 to 240V, 50/60Hz, <6W. Use copper conductors only. A user-supplied disconnect switch on a separate 15A circuit breaker should be located near the processor unit. Power line noise and interference are filtered by a built-in EMI filter.

PROBE WIRING: A 10m (33ft) of probe telemetry cable is supplied as standard. Contact your authorized distributor for extensions. The maximum length of cable extension is up to 100m (33ft) when authorized cable is in use.

USER CONNECTIONS: The controller supports up to 5 parts of connections. Connections include Probe, mA and Serial Outputs, Relay Output, Cleaning Device, and Power. The controller accommodates up to 5 parts of connections.

PROBE CONNECTION: Connect the five respective colored wires from the probe cable to a 5- position PHOENIX connector and then put it into the PCB board.

SERIAL COMMUNICATION: Serial communication (RS232/485) users may connect the serial wires to a 5-position PHOENIX connector and put it into the PCB board. The 5-position connector is composed of serial communication and analog output connections.

ANALOG OUTPUT: 4 to 20mA current output users may connect the wires to a 5-position PHOENIX type connector and put it into the PCB Board.

RELAY OUTPUT: Relay users may connect the wires to a 9-position PHOENIX type connector and put it into the PCB board.

CLEANING DEVICE: The cleaning device is activated using the controller’s power source. Connection is made using a 2-position PHOENIX connector. Use AC power.

POWER CONNECTION: An external power source (100 to 240V, 50 to 60Hz) activates the ENV100. Connection is made using a 3-position PHOENIX connector.