Graco Inc.

Reactor 2 – Ratio Assurance System  Prevent, Detect and Monitor Off-Ratio Conditions

Along with heat, pressure and mixing, spraying foam or polyurea that is "on ratio" is critical to achieving the properties intended by the material manufacturers, and therefore delivering the highest quality to your customers every time.

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Graco has identified the best method of detection for issues that may cause off-ratio foam or polyurea to be sprayed. These issues are called single-point variables. Utilizing inlet and outlet pressure monitoring and flow meters, the Reactor 2 can monitor for these issues and shut the proportioner down if required. The operator can then make the necessary updates in order to eliminate the off-ratio condition.

Reactor 2 Ratio Assurance System

  • Flow meters are now standard on Reactor 2 Elite models: E-30, H-30, H-40, H-50, E-XP2, H-XP2, and H-XP3
  • Kits are available to update existing Reactor 2 models
  • Ratio reports available using the Reactor app
  • Electric Reactors will now automatically adjust the speed of the motor engine to avoid pump cavitation.  This update is called ‘Reactor Smart Control’


Multi-tiered detection system

Multi-tiered detection system

The Reactor 2 Ratio Assurance System is designed to provide ratio detection so your job is being applied on-ratio and within tolerance.

Graco’s system will provide unsurpassed spray results by combining:

  1. Mechanically Linked Pumps
  2. Positive Displacement Piston Pumps
  3. Outlet Pressure Monitoring
  4. Flow Meters
  5. Inlet Pressure Monitoring

Single-Point Variables

Any issues that may cause off-ratio foam or polyurea to be sprayed are called Single-Point Variables. Since no one detection method is best to detect all possible issues, it is important to have a robust, multi-tiered ratio assurance system that incorporates both pressure and flow meter monitoring.

Single-Point Variables you will be able to detect using the Reactor 2 Ratio Assurance System:

  • Air in the fluid stream
  • Feed pump too small
  • Poor material feed to the proportioner
  • Proportioner pump issues
  • Fluid leaks
  • Fluid restriction in heated hose or spray gun


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