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Submersible Turbidity Sensor

Submersible Turbidity Sensor TU8182

The TU8182 is a Turbidity Sensor designed to be screwed into a riser tube for submersion into streams, weirs, pits, tanks or other unpressurised vessels.

The TU8182 works with our TU7685 Turbidity Controller, which amplifies the signal from the sensor and provides a visual indication of the turbidity measurement as well offering numerous control and transmission options.  The TU7685 can also control the auto-clean relay for use with the auto-clean nozzle on the TU8182.

The TU8182 uses an infrared light emitting source and a 90° photo-receptor to measure back scattering in accordance with ISO 7027EN 27027 regulations.

Manufactured in PVC with IP68 rating, the TU8182 is designed to be submersed into an open vessel, stream or pit to give continuous turbidity measurements.

Submersible Turbidity Sensor - NTU Ranges

The TU8182 is designed for water quality analysis and is suitable for drinking water applications, raw water applications and water and effluent treatment monitoring applications. The ranges available with the TU8182 are as follows:-

Please note Nephelometric Turbidity Units shows as NTU.

Turbidity RangeTurbidity Resolution
0 - 4.000 NTU 0.001 NTU
0 - 40.00 NTU 0.01 NTU
0 - 400.0 NTU 0.1 NTU
0 - 4000 NTU 1 NTU

The TU8182 is easily configurable with the TU7685 Turbidity Controller.  By accessing the configuration menu's in the TU7685, the TU8182 turbidity sensor can be rearranged as well as calibrated.  The TU8182 is a sophisticated sensor, able to offer a reading as low as 0.001 NTU through to 4000 NTU, all from the same optical sensor.

Submersion Turbidity Sensor

The TU8182 has a 2" thread at the rear of the device to allow it to be screwed into a riser tube for continuous or online turbidity measurements.  (See the picture above.)

The TU8182 is designed to continuously monitor the turbidity in a stream or tank and is used in applications such as water treatment monitoring, raw water monitoring and other water quality analysis in industrial or municipal environments.

In addition to the rear mounting thread, the TU8182 has an optional auto-clean nozzle which can be connected to a suitable compressed air system via a 1/4" x 3/8" hose connection. The Auto-clean system is triggered by the TU7685 Turbidity Controller.

When the auto-clean system is in use, the TU7685 controller enters into a freeze & hold mode. This means that while the TU8182 sensor is being cleaned, the value is held on the screen of the TU7685 and any control relays or outputs from the TU7685 are held. This means that no devices can be switched on or be affected by the TU7685 during the cleaning procedure.  The main reason for this is the potential for air bubbles to cause a false reading and in turn triggering any process or control devices.

The auto-clean system uses the compressed air to remove any contaminating agent or detritus from interfering with the lens of the turbidity sensor, so reducing the requirement for human involvement in preventative maintenance and prolonging the continuous operation.

The auto-clean air-nozzle is rated for use with a maximum air pressure of 3 Bar.

Submersible Turbidity Sensor Features & Benefits

The TU8182 is a precision turbidity sensor which is accurate across a very wide range of turbidity measurements.  Fully scaleable from the companion TU7685 Turbidity Controller, the TU8182 can measure from as low as 0.001 NTU, all the way up to 4000 NTU.

Designed to be permanently mounted into the flow of a weir, stream or into an open tank, to provide continuous turbidity readings, and measurements which can be controlled from the TU7685 controller.

The PVC body and IP68 rating allow the cell to be permanently mounted into a dip tube or riser tube and with the optional auto-clean system enabled, is designed to give continuous turbidity readings with minimal maintenance.

The turbidity measurements follow the standard nephelometric back scattering methodology (ISO 7027 - EN27027) and the infra-red light is not affected by the colour of the sample.

TU8182 Submersible Turbidity Sensor Specifications

  • Specifications


    Submersible Turbidity Transmitter

    Model No:- TU8182

    Turbidity Range & Resolution:- 0 – 4.000 NTU with 0.001 NTU resolution

    Turbidity Range & Resolution:- 0 – 40.00 NTU with 0.01 NTU resolution

    Turbidity Range & Resolution:- 0 – 400.0 NTU with 0.1 NTU resolution

    Turbidity Range & Resolution:- 0 – 4000 NTU with 1 NTU resolution

    Light:- IR LED to 890nm wavelength

    Materials and Rating:- Manufactured in PVC to IP68

    Operating temperature:- 0-50°C

    Operating Pressure:- 1 Bar at 25°C

    Autoclean:- by air pressure max 3 Bar

    Power supply:- 9 / 36 VDC

    Weight:- 800 grams

  • Features


    • Submersion Turbidity Sensor for installation into riser tube, which allows the TU8182 to give to continous or online Turbidity measurements from inside a tank, pit, weir, stream or other unpressurised vessel.
    • Nephelometric Turbidity measurements (ISO 7027 - EN 27027) give results in NTU. Ideal for water quality analysis.
    • Exceptional accuracy even at very low ranges, a resolution of just 0.001 NTU and a maximum scale of 4000 NTU all in the same compact design.
    • Optional auto-clean nozzle, means that when paired with the TU7685 and a compressed air source, and build up of material around the sensing lens of the TU8182 can be removed, reducing the requirement for human intervention outside scheduled preventative maintenance.
    • The TU8182 has no moving parts and requires minimal periodic calibration and maintenance.
    • Easy to configure using the TU7685, adjust the range, zero and span directly from the controller, using the on-screen menu driven system.
    • Designed specifically for precision measurements in drinking water analysis, water treatment, and effluent treatment applications.
  • Data Sheets

    Data Sheets


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