Across
- 3. type of element in an automatic control system that produces a corrective signal that is sent to the last element in the system
- 7. a control method in which the value of a process disturbance is measured, and action is taken to prevent the disturbance from changing the value of a controlled process variable
- 8. type of control used in combination with rate control
- 11. A resin bead has thousands of charged areas
- 12. refers to the amount of change that can occur in a process without causing a control system response
- 15. Water containing a large number of dissolved solids
- 17. Water containing a large volume of dissolved gases
- 19. replaces hard ions, which produce scale, with soft ions, which do not produce scale
- 20. can block passages and reduce heat transfer in pipes and equipment
Down
- 1. type of gas that is a respiratory irritant which can destroy lung tissue if it is inhaled
- 2. any condition that can cause a process variable to change away from set point
- 4. Chemicals that are added to water to speed up the actions of other chemicals
- 5. uses resin beads to replace many different kinds of ions with other ions that combine to form water
- 6. used to trap large, suspended solids
- 9. Type of control that can minimize the effects of capacitance and resistance in a process
- 10. can remove dissolved oxygen from water
- 13. treatment that removes suspended solids from water
- 14. The desired value of a controlled variable
- 16. is caused by the cumulative effects of capacitance, resistance, and dead time
- 18. used to aid in settling suspended solids