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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

Dissolved Ozone Analyzer

9185 sc

Dissolved Ozone Analyzer


Applications:  Drinking Water, Wastewater, Pure Water/Power, Industrial Water.

The 9185sc Ozone Sensor is an online, single-channel industrial sensor that measures ozone in drinking water treatment plants, distribution networks, and other applications that require monitoring of ozone at the ppb and ppm levels. This instrument uses an amperometric method to measure ozone concentration. A membrane allows the selective diffusion of ozone molecules to the amperometric sensor. The measurement is compensated for pH and temperature.

  • Few Interferences from Oxidants or pH over a Wide Measurement Range
  • Ideal for Low-Conductivity Samples
  • Reliable Amperometric Measurements
  • Easy Setup and Maintenance
  • Compatible with Hach's "Plug and Play" Digital Controllers


Accuracy:3 % or ±10 ppb O3, whichever is greater
Calibration Interval:2 months
Calibration Method:Zero Calibration: Electrically or with ozone-free water
Calibration: Comparison of lab method with process sample
Enclosure Rating:NEMA 4X/IP66
Flow:14 L/h (200 to 250 mL/min) autoregulated
by flow thru cell
Interferences:No interference from bromine,
chloramines, chlorine, chlorine dioxide,
or hydrogen peroxide
Lower Limit of Detection (LOD):0.005 mg/L ozone (O3)
Maintenance Interval:6 months for membrane and electrolyte (measurement cell)
Measuring Interval:Continuous
Measuring Principle:Amperometric/Membrane (electrode,
membrane, electrolyte)
Mounting:Flat, vertical surface (panel, stand, etc.)
Operating Temperature Range:0 to 45 °C
Pressure Range:0.1 2 bar in flow cell
Range:0 2 mg/L ozone (O3)
Relative Humidity:0 - 90 % non-condensing
Response Time:90 % in less than 90 seconds
Sample Input:0.25 " outer diameter
Sample Output:0.5 " inner diameter
Sample Temperature:2 45 °C (35.6-113 F)
Standard deviation:1.0
Storage Conditions:-20 °C to 60 °C
Temperature Compensation:Automatic over sample
temperature range
Weight:14.33 lbs. (6.5 kg) 14.3 lbs
Width US:(6.1 in)


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