Metroid Crossword

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Across
  1. 6. Ubiquitous networking technology, used by PC's and almost all PLC's
  2. 7. Continuously variable control signal
  3. 9. Standard communications protocol originally published by Modicon/Schneider
  4. 11. Vertical distance a pump can carry liquid
  5. 12. Common chemical used as a disinfectant
  6. 13. Main switch
  7. 14. Spectrum of light used for disinfection
  8. 16. Magnetic flow meter
  9. 17. Physical force exerted on the inside of a pipe
  10. 18. Flashing alarm beacon
  11. 20. Mechanical device used to control flow
  12. 21. The 'out' side of a pump
Down
  1. 1. Well-known European brand of PLC equipment and instrumentation
  2. 2. Large international pump manufacturer headquartered in Denmark
  3. 3. Measurement of hot or cold
  4. 4. Chemical that causes suspended particles to aggregate
  5. 5. Common metal used in outdoor switchboard enclosures
  6. 8. Measure of electrical 'pressure'
  7. 10. Type of level sensor utilising sound outside the upper limit of human hearing
  8. 15. Copper high-current conductor
  9. 19. Data acquisition and control system