This presentation describes a test method developed to accurately measure flow controller performance and shows examples comparing flow controllers in different chemicals.

1. Measuring the performance of flow controllers used in on-site chemical mixing Gary Van Schooneveld and Don Grant CT Associates, Inc. Eden Prairie, MN 55344 February 14, 2006

8. Test system hydraulic schematic

10. Test system response to a pressure change command Pressure increase from 15 to 50 psig. Pressure decrease from 50 to 15 psig.

11. Test system control and measurement capabilities

12. Examples of controller response to a set point change

13. Examples of controller accuracies

14. Examples of controller repeatabilities

15. Example of controller stabilities

16. Examples of controller response to a sudden pressure increase Controller 1 Controller 2

17. Examples of controller accuracies at different temperatures Controller 1 Controller 2

18. Example of the effect of chemical type on controller accuracy