Avocet Sludge Blanket Monitor

  • Sediment relative density throughout the tank聽shown on LCD display.
  • Improved efficiency and control of the聽treatment process
  • Warning of biological upset or hydraulic聽imbalance
  • Reduce site operational costs significantly with聽improved process control.
  • Reduced sensor maintenance (air purge聽cleaning).
  • Improves health and safety as no manual聽readings are needed

 

  • Description
  • Application Areas
  • Specifications
  • Brochure
  • User鈥檚 Guide
  • How It Works

Product Description

Avocet Sludge Blanket Monitor gives highly accurate measurements of sludge blanket composition by utilizing extremely high frequency ultrasound (1.1 MHz) that can detect the lowest sludge density found in primary and secondary clarifiers. Avocet Sludge Blanket Monitor聽is particularly suited for identifying聽auto-desludging and overspill alarm signals and聽for monitoring the general biological health of聽thick sludge blanket. Avocet Sludge Blanket Monitor聽is used to monitor and control the blanket level in settlement tanks for a wide range of industries and applications, benefits:

  • Sediment relative density throughout the tank聽shown on LCD display.
  • Improved efficiency and control of the聽treatment process
  • Warning of biological upset or hydraulic聽imbalance
  • Reduce site operational costs significantly with聽improved process control.
  • Reduced sensor maintenance (air purge聽cleaning).
  • Improves health and safety as no manual聽readings are needed

The Ultrasonic Transducer is immersed just聽below the surface of the water and pointed聽directly at the bottom of the tank. Avocet Sludge Blanket Monitor uses time of flight echo processing and聽advanced algorithms to lock on the true sludge聽interface level and ignore the floating solid聽particles and troublesome rag layers. The聽unique algorithms have been designed to聽automatically filter all floating particles and聽electrical noise interference for unmatched聽performance.

A simple 3-button key pad is used by the operator to input the tank depth. Avocet Sludge Blanket Monitor automatically does the rest with it鈥檚 advanced echo processing and signal gain adjustment. The LCD screen displays the echo profile for visual confirmation of the sludge level relative to the tank bottom. A 4-20 mA signal is provided proportional to the sludge level for SCADA input.

To overcome build up of solids on the sensor an聽air purge facility removes debris and reduces the聽need for continual maintenance.

Alarm states can be programmed for sensor聽failure/scum detection and high level聽sedimentation. An optional data storage facility聽enables the operator to observe the聽sedimentation performance over any historical聽period.

Avocet Sludge Blanket Monitor sets itself apart from other sludge聽blanket monitors by using extremely high聽ultrasonic frequencies of 1.1 MHz, and coupled聽with advanced signal processing, this allows the聽detection of very small particles even in hostile聽environments.

  • Primary Sedimentation
  • Secondary and Final Clarifiers
  • Remote Settlement Tanks
  • Sludge Thickeners
  • DAF Tanks
  • Sequential Batch Reactors (SBR)
  • Lamella Clarifiers
  • Counter Current Decantation (CCD) Tanks
  • Mining & Process Settling Ponds and Lagoons

Technology/Operation

  • Measuring Principle: Underwater ultrasonic sludge level monitoring
  • Measuring Range: 0.6-12 meters (2-39 ft)

Performance

  • Accuracy: 卤0.03 m
  • Resolution: 0.003 m
  • Response Rate: Fully adjustable
  • Echo Processing: Sophisticated algorithms using 32 bit Digital Signal Processing
  • Power Supply: 115/230 VAC

Outputs and Communications

  • Analogue: 4-20 mA output 750聽惟
  • Digital: 4 SPDT Programmable relays, 5 A @ 230 VAC (2 user programmable, 1 purge control, 1 LOE)
  • Telemetry(Optional): Site specific, range up to 2 miles (3 km)
  • Communication: Standard RS232, Optional RS485

Programming

  • User Interface: 3-button keypad with menu driven programming
  • Echo Profile: Graphical LCD display of raw echo profile
  • Programming Security: Password protected
  • Data Integrity: Non- volatile RAM

Environment

  • Temperature Range (electronics): -20 to +60掳C (-4 to +140掳F)
  • Outdoor Rating: IP 65, UL Approved Enclosure with UV Protected Clear Lid

Design

  • Dimensions: 280 x 219 x 156 mm (11 x 8.6 x 6.1 inch)
  • Cable Entry: 8 available for wall mount: 1xM12, 1xPG96, 5xM20 bottom row
  • Mounting:聽2 Fixed Holes & 1 Hanging Hole, Optional DIN Rail Tabs
  • Enclosure Material:聽Polycarbonate, flame resistant to UL94-5V
  • Weight:聽Approximately 1.4Kg (3 lbs)

Transducer Specifications

  • Standard Cable Length:聽20 meters (66 ft), optional custom lengths
  • Cable Specification:聽Shielded Coax Cable
  • Maximum Cable Run:聽50 meters (150 ft)
  • Temperature Range (Transducer):聽-40掳C to +95掳C (-40掳F to +200掳F)
  • Dimensions:聽50 mm diameter x 75 mm length (2 x 3 inches)
  • Mounting:聽1 inch NPT Male Thread
  • Material:聽PVC Housing, IP68 Rating
  • Beam Angle & Frequency:聽6掳 total, 12. MHz
  • Cleaning:聽Hose Tail Air Pipe Connector for Air Purge
  • Cleaning Frequency:聽User-programmable, 1-720 minutes (12 hours)
  • Weight:聽Approximately 0.5 Kg (1 lbs)

Avocet Sludge Blanket Monitor Brochure

Avocet Sludge Blanket Monitor User Guide

The ultrasonic sensor probe is immersed just below the surface of the supernatant pointing directly towards the bottom of the tank. The sensor both transmits the sonar pulse and then receives the returned back-scattered signal. The computer system in the Outstation processes this back-scattered data to build up the distribution of particles as a function of depth into the effluent. This is displayed in a graphical form on the Outstation along with all relevant measurement data.