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Pulsonic Avocet – Sludge Blanket Monitor
The Avocet Sludge Blanket monitor offers one of the most accurate sludge blanket detectors on the market by utilising extremely high frequency ultrasound (1.1MHz) that can detect the lowest sludge density found in secondary clarifiers whist easily detecting high density sludge in primary clarifiers.
Powerful Signal Processing
Defining sludge blanket interfaces is quite a complex task, especially in secondary algorithms and multiple interface layers can cause confusion. The Avocet utilises a range of powerful processing algorithms that the user can programme to generate the optimum sludge return signal. To aid the user, the Avocet allows the user to view the raw return echoes from the clarifier so he/she can tailor the signal processing algorithms to maximise performance.
In secondary clarifiers sludge, layers are often diffuse and difficult to detect. In such clarifiers the Avocet does the signal processing for you and it decides on what is the strongest sludge return echo by utilising extremely powerful mathematical techniques.
High Frequency Sensor
The ability of an ultrasonic sensor to detect the smallest particles is directly equal to the ultrasonic frequency. At 1.1MHz the Avocet has the highest frequency of any product in the market which enables it to detect the smallest particle size and particularly in secondary clarifier with weal opaque sludge layers, its performance is second to none.
Large Clear Display
The Avocet has a large 5” 240×128 graphics display, that in the run mode, shows and marks the sludge level interface on a vertical graph and shows the status of the instrument parameters.
Air Purge Cleaning
The Avocet uses air purge cleaning that is programmable and controlled via one of its four relays. Air purge is preferred to wiper cleaning which are prone to mechanical failure through wiper seizure and water ingress. Air purging is simple, effective and more reliable.
|Measuring Principle||Underwater ultrasonic sludge level measurement|
|Measuring Range||0.6-12 metres (2-39 ft)|
|Response Rate||Fully adjustable|
|Echo Processing||Sophisticated algorhithms using 32 bit Digital Signal Processing|
|Power Supply||115/230 VAC|
|Outputs and Communications|
|Analogue||1 4-20mA output, 750Ω|
|Digital||4 SPDT programmable relays, 5A @ 230 VAC (2 user programmable, 1 purge control, 1 LOE)|
|Telemetry (optional)||Site specific, range up to 2 miles (3km)|
|Communication||Standard RS232, optional RS485|
|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|
|Temperature Range (electronics)||-20°C to +60°C (-4°F to +140°F)|
|Outdoor Rating||IP65, UL Approved Enclosure with UV Protected Clear Lid|
|Dimensions||280 x 219 x 156 mm (11.0 x 8.6 x 6.1 inch)|
|Cable Entry||8 Available for Wall Mount: 1xM12, 1xPG9, 5xM20 bottom row|
|Mounting||2 Fixed Holes & 1 Hanging Hole, Optional DIN Rail Tabs|
|Enclosure Material||Polycarbonate, flmae resistant to UL94-5V|
|Weight||Approximately 1.4Kg (3 lbs)|
|Standard Cable Length||20 metres (66 ft), optional custom lengths|
|Cable Specification||Shielded Coax Cable|
|Maximum Cable Run||50 metres (150 ft)|
|Temperature Range (Transducer)||-40°C to +95°C (-40°F to +200°F)|
|Dimensions||50mm diameter x 75mm length (2 x 3 inches)|
|Mounting||1 inch NPT Male Thread|
|Material||PVC Housing, IP68 Rating|
|Beam Angle & Frequency||6° total, 12. MHz|
|Cleaning||Hose Tail Air Pipe Connector for Air Purge|
|Cleaning Frequency||User-programmable, 1-720 minutes (12 hours)|
|Weight||Approximately 0.5 Kg (1 lbs)|