Turbidity describes how cloudy water is, caused by suspended particles. Online turbidity monitoring is widely used in waterworks, sewage treatment, environmental monitoring, industrial process water and drinking water quality control.

Asmik turbidity sensors are based on the light scattering principle (infrared, 90° scattering). A light source shines into the water, and a detector measures the light scattered by suspended particles; the amount of scattered light is related to the turbidity.

ISO 7027 is an international standard for turbidity measurement using near-infrared light. Because infrared light is not absorbed by dissolved colors in the water, the measurement is not affected by chroma. The MIK-PTU200 and MIK-PTU-8011 use infrared double scattering light technology based on ISO 7027.

Turbidity is commonly expressed in NTU (nephelometric turbidity units) or FNU (formazin nephelometric units). FNU is typically associated with infrared measurement according to ISO 7027. Please check each product page for its units and range.

• MIK-DC2000: liquid analyzing meter and turbidity transmitter
• MIK-PTU200: turbidity meter using infrared scattered light and ISO 7027
• MIK-PTU300: laser low-turbidity meter for drinking water, including membrane-treated water
• MIK-PTU8012: low turbidity sensor for sewage plants, drinking water plants, water stations and surface water
• MIK-PTU-8010: infrared turbidity sensor with self-cleaning and digital output
• MIK-PTU-8011: infrared turbidity sensor based on ISO 7027
• MIK-PSS9010: infrared scattering sensor for suspended solids, with optional cleaning brush

If you are unsure, send us your application details and our engineers will recommend a model.

The MIK-PTU300 uses a laser light source with a very high signal-to-noise ratio and high monitoring accuracy, and can be used for drinking water after membrane treatment. Its water consumption is small and it features automatic discharge. The MIK-PTU8012 low turbidity sensor is also used in drinking water plants and water stations.

A laser light source provides a very high signal-to-noise ratio, which improves sensitivity and accuracy at very low turbidity levels, such as in treated drinking water.

Turbidity is an optical property that describes how much light is scattered by particles, while TSS (total suspended solids) is the mass concentration of particles, usually in mg/L. The two are related but not identical, since particle size, shape and color also affect light scattering. For suspended solids and sludge concentration, see our TSS/SS sensors and the MIK-PSS9010.

Yes. The MIK-PTU-8010 features self-cleaning, and the MIK-PSS9010 offers an optional cleaning brush for continuous online monitoring. Self-cleaning helps keep the optical window clean in dirty water.

Yes. Air bubbles scatter light and can cause falsely high readings. Install the sensor where bubbles are minimal, and for low-turbidity measurement use a flow-through or debubbling arrangement where recommended.

Turbidity sensors are generally calibrated with standard solutions such as formazin, or checked with secondary standards, following the procedure of the selected instrument.

Asmik turbidity sensors are designed for easy maintenance and low operating costs. The main task is keeping the optical window clean; self-cleaning models reduce manual cleaning. Periodic verification against a standard is recommended.

Asmik turbidity sensors and transmitters offer strong compatibility with standard outputs, and models such as the MIK-PTU-8010 provide digital output with plug-and-play installation. Available outputs depend on the model; please check the product page or tell us your requirements.

• Install the sensor where the water is representative and well mixed.
• Avoid locations with many air bubbles or direct sunlight on the optical window.
• Keep the optical window away from walls and the bottom to avoid reflections.
• For low-turbidity drinking water, use a flow-through meter such as the MIK-PTU300.
• Make sure the sensor can be removed easily for cleaning.

Please follow the installation manual of the selected model.

Typical applications include waterworks and drinking water plants, sewage treatment, environmental and surface water monitoring, industrial process water and aquaculture.

To help us select the correct model, please provide:

• Application (drinking water, sewage, surface water, process water, aquaculture)
• Expected turbidity range
• Installation method (immersion or flow-through)
• Fouling conditions and need for self-cleaning
• Output requirements and power supply
• Whether a display transmitter is required
• Quantity

Send your requirements to info@asmik.com or contact us via WhatsApp at +86 13325716921.