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HACH COMPANY was established in 1947, in Ames, Iowa, USA. For more than 60 years, Hach has been the world market leader for Analytical Instrumentation for Complete Water Analysis, providing solutions for lab, process and field.

In 2002, GLI, a leading US manufacturer of process electro-chemistry analytical instruments, became part of the Hach Company family.

Water analysis has to be right. Our customers deserve complete, reliable solutions that they can be fully  confident in. Hach is your answer. We make water analysis simpler

Hardness Monitor


Hardness Monitor


Immediately signal hardness breakthrough to activate regeneration. Makes your water softening system more efficient and less costly. Reliable, simple and accurate- with automated calibration. Continuous monitoring in "real time".

  • Continuous Hardness Detection
  • Simple to Read and Use
  • Rugged, lightweight, and self-contained
  • Making Water Softening Systems Cost-efficient
  • Low Maintenance Requirements


Alarm:2 consectutive cycles above set point activate alarm. 1 cycle below set point cancels alarm.
Certifications:NRTL certified to UL and CSA standards, and CE approved
Cycle Time:2 average
Output:1 SPDT relay
Power Requirements (Voltage):115/230 V AC
Reagent Requirements:1 each of indicator and buffer. Replenish every two months for continuous operation.
Repeatability:10 % of set point value in 0.3-2 mg/L ranges


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