Amperometric Chlorine Analyzer
“Reagentless”
hIgh resolution Color Display
LIVE
sensor
charting
DATA LOGGING
W/ Micro-SD CARD
multilingual
(english, spanish, etc.)
The Chemtrac HydroACT Reagentless Chlorine Analyzer takes online disinfection monitoring to a new level of reliability by offering industry-leading performance, an excellent track record of EPA Method 334.0 compliance, reduced pH dependency, and no requirement for zero calibration. Chemtrac’s line of amperometric membrane-covered Free and Total Chlorine sensors have no moving parts, no bottles of reagent to change out monthly, and quarterly maintenance takes less than five minutes to perform.
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Overview
The Chemtrac HydroACT Reagentless Chlorine Analyzer takes online disinfection monitoring to a new level of reliability by offering industry-leading performance, an excellent track record of EPA Method 334.0 compliance, reduced pH dependency, and no requirement for zero calibration. Chemtrac’s line of amperometric membrane-covered Free and Total Chlorine sensors have no moving parts, no bottles of reagent to change out monthly, and quarterly maintenance takes less than five minutes to perform. HydroACT offers a versatile solution to your disinfection monitoring needs with the flexibility to accept additional sensors, as well as offering expandable I/O and PID control loops.
The HydroACT Chlorine Analyzer standard configuration includes version HA2 analyzer, 1 sensor (Free or Total Chlorine), 1 analog output, and 1 year
consumables. Optional features include relays, digital inputs, digital comms, expanded number of sensor inputs and analog outputs, color display, and data
download capability. Maximum I/O capabilities and certain features are specific to the different versions of HydroACT as detailed below.
dashboard
sensor screen
chart view
diagram screen
3D Model View
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
Free residual chlorine or total residual chlorine
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Probe Ranges
0.01 – 2, 0.01 – 5, 0.01 – 10, or 0.01 – 20 mg/L
0.01 – 200 mg/L (Free residual chlorine only) -
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 4 – pH 9 (Free), pH 4 – pH 12 (Total)
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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
Manual using DPD
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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
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Interferences
Ozone and chlorine dioxide. Surfactants are partially tolerated
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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Wall & panel mount
•
•
•
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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
*Sensors, I/O, and relays are all optional and must be specified at time of ordering.
Downloads
| Title | Category | Upload Date | File Size | Download |
|---|---|---|---|---|
Understanding On-line Amperometric Chlorine Measurements
|
Chlorine (Free or Total), Disinfectant Analyzers (Chlorine, Ozone, etc.) | Nov 3, 2025 | 700 KB | Download |
|
Residual Chlorine Dioxide Analyzer
|
Chlorine (Free or Total), Disinfectant Analyzers (Chlorine, Ozone, etc.), HydroACT Multiparameter Analyzer | Nov 3, 2025 | 448 KB | Download |
|
Quick Start For HydroACT with Chlorine
|
Chlorine (Free or Total), Disinfectant Analyzers (Chlorine, Ozone, etc.), HydroACT Multiparameter Analyzer | Nov 3, 2025 | 2 MB | 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 Analyzer – Datasheet
|
Chlorine (Free or Total), Disinfectant Analyzers (Chlorine, Ozone, etc.), HydroACT Multiparameter Analyzer | Nov 3, 2025 | 1 MB | Download |
|
HydroACT 4 Free Chlorine Operations Manual
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Chlorine (Free or Total), Disinfectant Analyzers (Chlorine, Ozone, etc.), HydroACT Multiparameter Analyzer | Nov 3, 2025 | 3 MB | Download |
|
Free Chlorine Residual Hints & Tips
|
Chlorine (Free or Total), Disinfectant Analyzers (Chlorine, Ozone, etc.) | Oct 29, 2025 | 450 KB | Download |
Understanding On-line Amperometric Chlorine Measurements
Residual Chlorine Dioxide Analyzer
Quick Start For HydroACT with Chlorine
Membrane Cap Ordering Info
HydroACT Residual Chlorine Analyzer – Datasheet
HydroACT 4 Free Chlorine Operations Manual