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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 Analyzer

APA 6000™

Hardness Analyzer


The APA 6000 High Range Hardness Analyzer measures high-range hardness using USEPA-approved calmagite chemistry. Range 10 to 1,000 mg/L. Accurately and continuously measures up to two sample streams. Operates unattended for one month. Makes your water softening system more efficient and less costly.

  • Measures high-range hardness using EPA-approved calmagite chemistry
  • Accurately and continuously measures up to two sample streams
  • Easy to Use
  • Industrial and Ultrapure Water Applications
  • Makes your water softening system more efficient and less costly


Accuracy:± 5 % of reading or ± 2 mg/L CaCO3 whichever is greater
Alarm:Two SPDT relays with contacts rated for 5A resistive load at 230 Vac. Additional relays available with optional Signal Output Modules.
Certifications:NRTL certified to UL and CSA standards and CE approved
Cycle Time:8.2 min
Drain Fitting:3/4" NPT barbed hose fitting
Inlet Pressure:0.5 to 30.0 psig (0.03 to 2.04 bar)
Length:21 in ( 533 mm ) (522 mm)
Output:Two 4-20 mA outputs suitable for recorders or PID control. Ouput span programmable over any portion of the measuring range (130 Vac isolation from earth ground)
Parameter:High Range Hardness (10 - 1000 mg/L)
Power Requirements (Hz):50/60 Hz
Power Requirements (Voltage):110 - 240 V AC
Range:10 to 1000 mg/L hardness as CaCO3
Repeatability:± 5 % of reading or ± 2 mg/L CaCO3, whichever is greater
Response Time:Less than 17 min for 90% response
Sample Flow Rate:max 100 to 2000 mL/min
Sample Temperature:5 to 50 °C (41 to 122°F)
Weight:56.22 lbs. (25.5 kg)


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