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    AquaMetrix products have been manufactured for more than five decades. The company has grown into a worldwide maker of water quality instrumentation that is known for working in environments where nothing else works. Aquametrix products have been made in the United States since 2010.                          

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AM-2251 Controller

AM-2251 Controller


The AM-2251 is the newest addition to the 2250 family. Built in the image of the AM-2250 it replaces the 2200D as our D.O. controller while also adding toroidal conductivity.



  • pH, ORP, toroidal conductivity & dissolved oxygen parameters available
  • Highly visible large backlit LCD display
  • Flexible and easy calibration, including multi-point conductivity calibration for acids and bases
  • 4-20mA process output with range scaling and PID Control
  • Universal mounting hardware for surface, panel and pipe mounting
  • Compatible with AquaMetrix models 60-series differential pH/ORP sensors, 500-series combination style pH/OR sensors, ES1A toroidal conductivity sensor, and P91 dissolved oxygen sensor
  • Second 4-20 mA output with range scaling and temperature
  • Three control/alarm relays with temperature


  • Industrial process control, e.g. plating, food and beverage, chemical processing, pulp & paper, mining, food and beverage
  • Municipal water and wastewater treatment
  • Industrial and municipal waste treatment and Neutralization
  • Fume scrubbers
  • HVAC, cooling towers and boilers


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