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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

Chlorine Dioxide Analyzer

9187 sc

Chlorine Dioxide Analyzer


The 9187sc Chlorine Dioxide (ClO2) Sensor is an online, single-channel industrial sensor that measures ClO2 in drinking water treatment plants, distribution networks, and other applications that require monitoring ClO2 at the ppb and ppm levels. This instrument uses an amperometric method to measure ClO2 concentration. A membrane allows the selective diffusion of ClO2 molecules to the amperometric sensor. The measurement is compensated for temperature.

  • Selective Membrane Avoids Interference from other species
  • Easy Setup and Maintenance
  • Compatible with Hach's "Plug and Play" Digital Controllers
  • Minimal maintenance thanks to automatic cleaning
  • Compatible with multi-sensor, multi-parameter digital controllers


Accuracy:5 % or ±10 ppb ClO2, 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):0.01 mg/L ClO2
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
Parameter:Chlorine Dioxide
Pressure Range:0.1 to 2 bar in flow cell
Range:0 to 2 mg/L as chlorine dioxide (ClO2)
Relative Humidity:0 to 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 to 45 °C (35.6-113 F)
Standard deviation:1.5
Storage Conditions:-20 °C to 60 °C
Temperature Compensation:Automatic over sample
temperature range
Weight:14.33 lbs. (6.5 kg) 14.3 lbs


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