A Guide to Rate Controllers for Agricultural Sprayers

A Guide to Rate Controllers for Agricultural Sprayers

Rate controllers have become a standard piece of equipment in the agricultural industry, due to their ability to ensure a consistent application of spray to the desired area of crops.

We have put together the following guide that covers what a rate controller is, how it works, and how you can use the RDS Spraymaster 200.

What is a rate controller?

Put simply, a rate controller controls the rate at which a liquid is sprayed over crops. This liquid could be a fertiliser, herbicide, or pesticide – all of which are important for the maintenance of crop health during the growth cycle.

It allows the farmer to input a desired application volume and control the spray pressure that gives the necessary flow. In general, the faster the vehicle is moving, the higher the pressure of the sprayer.

The primary benefit of using a rate controller is that it makes the process more efficient, as the crops will be receiving the optimum amount of sprayed liquid and have the best chance of success. An increase in efficiency results in reduced costs and maximising yield.

Using the RDS MME Rate Controller: Spraymaster 200

The RDS Spraymaster 200 is an entry-level sprayer control system. It accurately applies the liquid spray product proportionately to the forward speed of the vehicle it is retrofitted onto. The target rate can be inputted into the instrument and the application rate is set by a control valve.

Spraymaster 200

The Spraymaster 200 can work from a pressure or flow-based sensor, providing information on the:

  • speed
  • application rate
  • total and partial area
  • total and partial volume applied
  • pressure, flow, and tank level

It works with both manual and electrically operated sprayers, cutting chemical wastage due to its efficient optimisation.

You can contact the RDS MME team by calling 01249 479356 or sending a message to

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