Chlorine Dioxide
with HydroACT Multiparameter Analyzer
touchscreen hi-res Color Display
LIVE
titration
charting
Data logging and
export
multilingual
(english, spanish, etc.)
The HydroACT Reagentless Chlorine Dioxide Analyzer is one of our online disinfection monitoring solutions. Just like with the other HydroACT series products, our Chlorine Dioxide (ClO2) sensor is simple to install, and extremely reliable. The membrane covered probe is exceptionally stable for chlorine dioxide measurement, and requires no zero calibration. The vented flow cell allows for ideal sample flow to give the best detection results. Not needing reagents, the system requires minimal maintenance, and hence has lower overall lifetime costs than competitors’ products. The analyzer can be used for simple monitoring, as well as for controlling the Chlorine Dioxide dosage and maintaining the target residual.
HydroACT analyzers and controllers offer versatile solutions for your disinfection monitoring needs, with the flexibility to accept additional sensors, as well as offering expandable I/O, and PID control loops.
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Overview
The Chlorine Dioxide Analyzers can be used for whatever water applications where chlorine dioxide residuals need to be monitored and/or controlled. They consist of a HydroACT multi-parameter analyzer, a chlorine dioxide probe sensor, and a sample flow cell.
There are options for the HydroACT configurations depending on how many sensor inputs are necessary, output and communication needs, and control requirements.
Standard flow cells are for a single probe. There are also options for two and three probe flow cells.
dashboard
sensor screen
chart view
diagram screen
Videos
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Case History – Auburn WTP Utilizes Chemtrac Chlorine AnalyzersTestimonialA Water Treatment Plant in Auburn, AL has the need to monitor free chlorine onsite, as well as at remote locations in the distribution system, where they do…
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Water Solutions Unlimited and Chemtrac Team-up to Provide Instrumentation SolutionsTestimonialChemtrac values having outstanding relationships with their sales reps, like Water Solutions Unlimited, to provide water treatment analyzer solutions to plants throughout the country…and around the world.
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Chemtrac Chlorine AnalyzerDemonstrationThe Chemtrac Chlorine Analyzers take online disinfection monitoring to a new level of rleiability. They are accurate, pH independent, and offer a low cost of ownership with a…
Q & A’s
Specifications
Features
Description
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Type
Membrane-covered amperometric three-electrode system
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Measured
Chlorine Dioxide
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Probe Ranges
0.01 – 2, 0.01 – 5, 0.01 – 10, or 0.01 – 20 mg/L
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Resolution
0.01 mg/L (ppm)
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Reproducibility
±5%
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Stability
-2% per month (without calibration)
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Working Electrode
Gold cathode
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Counter Electrode
Stainless steel anode
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Reference Electrode
Silver/silver halide
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Flow Rate
15 to 60 L/hr.
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Temperature Range
> 41° up to < 113° F (> 5 up to < 45° C)
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Temperature Compensation
Automatically by integrated thermistor (ATC)
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pH Range
pH 2 – pH 11
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Permissible Over-Pressure
7.25 psi (0.5 bar)
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First Polarization Time
120 min.
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Re-Polarization Time
30 min.
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Zero-Point Adjustment
Not necessary
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Calibration
At the device, by analytical determination
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Housing Material
PVC, silicone, polycarbonate, stainless steel
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Dimensions
Diameter approx. 0.98 in., length 6.89 in.
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Replacement Intervals (Membrane)
Annually (approx.) depending on water quality
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Replacement Intervals (Electrolyte)
3 – 6 months depending on water quality
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Interferences
Ozone and chlorine. Surfactants are partially tolerated
*Not suitable for measuring or controlling for dechlorination. Recommended to have a chlorine residual of at least 0.10 ppm at all times.
HydroACT Features
HA2
HA4
HA8
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Sensor limit*
2
4
8
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Analog output limit*
2
4
8
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Relay limit*
4
8
16
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Digital Input limit*
4
8
16
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Isolated universal I/O
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Nema 4X/IP65
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•
•
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Wall & panel mount
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•
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Multilingual
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High resolution display
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Graphical trending
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On/Off threshold control
optional
optional
optional
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Advanced control (e.g. PID)
optional
optional
optional
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Color display
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Customizable data logs
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MicroSD card download
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Remote (Internet) access
optional
optional
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PROFIBUS, Modbus
optional
optional
*Optional configuration limits. See above description for standard configuration of analyzer version & I/O setup. Optional configurations must be specified.
Downloads
| Title | Category | Upload Date | File Size | Download |
|---|---|---|---|---|
Membrane Cap Ordering Info
|
Chlorine (Free or Total), Chlorine Dioxide, Disinfectant Analyzers (Chlorine, Ozone, etc.), Ozone | Nov 3, 2025 | 131 KB | Download |
|
HydroACT Residual Chlorine Dioxide Analyzer
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Chlorine Dioxide, Disinfectant Analyzers (Chlorine, Ozone, etc.), HydroACT Multiparameter Analyzer | Nov 3, 2025 | 448 KB | Download |
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HydroACT 4 Chlorine Dioxide Operations Manual
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Chlorine Dioxide, Disinfectant Analyzers (Chlorine, Ozone, etc.), HydroACT Multiparameter Analyzer | Nov 3, 2025 | 3 MB | Download |
Membrane Cap Ordering Info
HydroACT Residual Chlorine Dioxide Analyzer