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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

Low Range Hardness Analyzer

APA 6000™

Low Range Hardness Analyzer


Measures low-range hardness using USEPA-approved calmagite chemistry. Range 50 to 10,000 ug/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.

  • Accurate and Continuous Monitoring of Soluble Hardness
  • Optimize Softener Performance
  • Industrial and Ultrapure Water Applications
  • Easy to Use
  • Automatic 2-Stream Analysis


Accuracy:± 5 % of reading or ± 0.03 mg/L 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:4 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:Low Range Hardness (50-10,000 µg/L)
Power Requirements (Hz):50/60 Hz
Power Requirements (Voltage):90 - 240 V AC
Range:0.05 to 10 mg/L hardness as CaCO3
Repeatability:± 3 % of reading or ± 0.03 mg/L, whichever is greater
Response Time:Less than 5 min for 90% response
Sample Flow Rate:100 to 2000 mL/min max
Sample Temperature:5 to 50 °C (41 to 122°F)
Weight:56.22 lbs. (25.5 kg)


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