ABB 4690 Series Turbidity Systems

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ABB 4690 Series Turbidity Systems are rugged, reliable instruments designed to measure the turbidity content of water. They feature automatic cell cleaning and dry secondary standard verification, making them ideal for a wide range of applications, including drinking water treatment, wastewater treatment, and industrial process control.

Applications: Environmental Monitoring, Research, Industrial Process Control, Quality Control, Agriculture and Irrigation, Municipal and Governmental Agencies, Water Treatment and Quality Monitoring, etc

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ABB 4690 Series Turbidity Systems is a state-of-the-art system for the continuous measurement of turbidity in water. It is based on the nephelometric method, which measures the amount of light scattered by suspended particles in the water sample. The system is highly accurate and reliable

Features of ABB 4690 Series Turbidity Systems:

Flow-through turbidity design

  • fast response to process turbidity changes due to minimal sample residence time

Automatic sensor cleaning

  • reduces maintenance requirements
  • optimizes performance sensitivity

Secondary standards for calibration

  • accurate, repeatable, simple, safe
    • realize significant cost savings by reducing the use of primary standards

Reliable and accurate measurement

  • ultralow back scatter for accurate measurement of low turbidity values
  • • automatic bubble rejection to compensate for erroneous readings due to degassing

Additional information

Weight 1 kg


Model No


Measuring Range

0 to 400 NTU


±5 % of reading or 0.3 NTU


0 to 200 NTU: <1 %, 200 to 400 NTU: 2 %

Low range version

0.003 NTU

High range version

0.3 NTU

Response Time

T90 < 1 min at 1 l/min-1 (0.26 gall [US]/min-1)

Operating Temperature

0 to 50 °C (32 to 122 °F)

Sample pressure

Up to 3 bar (43.5 psi)

Ambient Operating Temperature

0 to 50 °C (32 to 122 °F)

Ambient Operating Humidity

Up to 95 % RH

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ABB 4690 Series Turbidity Systems