Online Suspended Solids Sensor

Suspended Solids SensorSelf Cleaning Suspended Solids Sensor

The TurbiTechw² LA Sensor has been designed for use in aeration systems monitoring suspended solids also known as mixed liquor suspended solids or activated sludge where solids are typically in the range of 1,500 to 3,500 mg/l.

The sensor can also measure Returned Activated Sludge (RAS), Surplus Activated Sludge (SAS) and suspended solids or turbidity. The fully automatic self cleaning system ensures that manual intervention on a routine basis is not required.

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  • The large optical surface and sample volume combine to ensure that the sensor is providing information that is reliable and representative of the solids present in the process. Deposits of fats and grease on the sensing area do not prevent the sensor from measuring unlike sensors with small optical surfaces. In addition, the sensor incorporates a self cleaning mechanism that ensures the optical surfaces are kept clean at all times, the cleaning system is designed to avoid problems with ragging and does not smear the optical system.

    The TurbiTechw² LA Sensor uses infrared light at 860 nm and operates using the Light Attenuation Principle. The cleaning mechanism uses a polyurethane wiper seal, sealed by 2 Nitrile ‘H’ Rings that finish the cleaning process. The Nitrile seals can be exchanged for Viton if the process media dictates. The cleaning process is automatically initiated by the 7300w² Monitor at a user determined frequency. The cleaning process takes only 90 seconds, which means that the sensor is available for 99.5% of the time with a 5 hourly cleaning cycle.

  • Physical
    Dimensions (hxwxd) Ø80mm, 470 mm long
    Weight 2.2 kg
    Protection Class IP68
    Enclosure Material Black Acetal Co-Polymer, 316 Stainless Steel, Glass
    Seal Material Polyurethane, Nitrile, with option of Viton
    Cable Entry Integral Cable Gland
    Cable Length 10 metres standard, 100 metres maximum

    Interface to Monitor
    Power Supply 12 VDC from Monitor
    Sensor Output ModTechw², RS485

    Environmental Data
    Operating/Storage Temperature 0 to 50ºC
    Location Indoor/Outdoor
    Pressure Rating 10 mWC
    Maintenance
    Service Seal Service every 3500 cleans (application dependent)
    Calibration The sensor is inherently stable, calibration should be carried out to suit the application. Our recommendation is every 6 months.

  • Measuring Characteristics
    Principal of Operation Light Attenuation/Scatter
    Wavelength 860 nm Infrared
    Accuracy Better than +/-5% of reading on real sample
    Resolution Dependent on range setting, typically +/-2% of reading
    Display Resolution see 7300w² Monitor
    Response Time 0.5 seconds damping provided by monitor
    Flowrate Not affected by flowrate, avoid deadspots and extreme turbulence
    Units User Selectable mg/l, g/l, ppm, %SS, NTU
    Maximum Range 0-20,000 mg/l (0-10,000 NTU)
    Minimum Range 0-4,000 mg/l (0-2,000 NTU)
    The actual measuring range will depend on the nature of the sample being monitored, for processes normally operating at 10,000 mg/l or more should consider use of the HR version of this sensor.
    Processes that use carbon will provide higher than expected readings and the HR version of the sensor should be used.

  • Part Number with Description
    223617 TurbiTechw² LA Sensor (Cable Length: 10 metres, Nitrile Seals)
    223872 TurbiTechw² LA Sensor (Cable Length: 20 metres, Nitrile Seals)
    223873 TurbiTechw² LA Sensor (Cable Length: 10 metres, Viton Seals)
    223874 TurbiTechw² LA Sensor (Cable Length: 20 metres, Viton Seals)
    Mounting Shafts
    152703 FlexTech Mounting Shaft (TurbiTechw² LA/HR/LS, 1.0 metres)
    152701 FlexTech Mounting Shaft (TurbiTechw² LA/HR/LS, 1.0 metres)
    152705 FlexTech Mounting Shaft (TurbiTechw² LA/HR/LS, 1.0 metres)
    Mounting Brackets
    223980 FlexTech Sensor Bracket (Handrail Ø 43 to 60.3 mm)
    224567 FlexTech Sensor Bracket Extension Assembly (500 mm Long, Handrail Ø 43 to 60.3 mm)
    Seal Service Pack
    156260 Seal Service Pack – TurbiTechw² LA/LS, Nitrile H RIngs
    156261 Seal Service Pack – TurbiTechw² LA/LS, Viton H RIngs



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