Automatic Coagulation Control System for Water Treatment

Discover our coagulant dose control system

Automatic Coagulation Control from PMA uses the on-line measurements of inlet water turbidity and UV-VIS spectral analysis provided by the s::can Spectro::lyser to predict the coagulant dose required to achieve treatment aims.

Compass Coagulation Control System

Compass is a cutting-edge advanced automatic coagulation control system for water treatment, suitable for use with any coagulant.

The key benefits

Our award winning coagulation control system is especially effective on flashy water sources and optimises coagulant dose to achieve your drinking water treatment aims.


Instant response to raw water changes.


Unaffected independent process control.


Eradicates under-dosing and increases plant performance.


Eradicates overdosing and decreases operating costs.

Benefits of

using compass

Conventional Mode

  • Max Turbidity removal-all conditions
  • Very low metal residuals
  • Max removal of coagulable organics
  • Longer filter run times
  • Reduced chlorine demand

Enhanced Mode

  • Reduced sludge load
  • Reduced risk of DBP formation
  • Reduced chemical costs
  • More stable chlorine residuals

Truly advanced

Compass will provide the optimum coagulant dose based on the raw water conditions and provide a mg/l output predicted dose to SCADA. Alternatively, a flow signal can be taken directly into the controller and the dosing pump can be controlled directly by Compass.

Automatic coagulation control solution for drinking water from PMA Ltd.


The Compass feed forward control system is designed for turbidity removal in drinking water treatment. It provides the best system to meet filter turbidity targets (e.g. <0.1NTU) at the lowest coagulant dose possible.

Compass EOR

The Compass enhanced organics removal (EOR) feedback system is aimed for users seeking to minimise dissolved organics in the filtered water. It delivers the optimum dose to meet filter turbidity objectives and maximise dissolved organics removal.

Automatic coagulation control system designed to be fast, responsive save you an annual return on investment of up to 80%.

To contact us, or to request a callback, simply use the form below and we will promptly get back to you.

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We greatly value all of the inquiries which our products and services generate and we are very confident that we will have the right solution available for you at the first point of contact when you reach our experienced team of engineers. As an added incentive to any company in the UK, your enquiry about any of our products will get you entered into a prize draw to win an iPad Pro. So what are you waiting for?

Need help with anything?

Contact us directly
at [email protected]

A bit about us

Established in 1971 PMA is a well-recognised provider of online instrumentation for process control and compliance monitoring. With expertise in analytical techniques such as Photometry, Colorimetry, Ion-selective electrodes (ISEs), Titration, Fluorescence, Ultrasonics and more.

© 2020 Process Measurement and Analysis Ltd, Water, Oil, Chemicals.

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