Hybrid Chlorine Analyzer

with HydroACT Multiparameter Analyzer

touchscreen hi-res Color Display

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titration
charting

Data logging and
export

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(english, spanish, etc.)

The Hybrid Chlorine Analyzer is a novel, innovative, and patented solution designed to provide greater reliability and peace of mind to online chlorine measurement. By uniquely combining the two most proven technologies—the continuous reading and stability of an advanced three-electrode electrochemical sensor and the inherent reliability of DPD colorimetry—this system delivers unparalleled accuracy and resilience for your disinfection monitoring needs.

Drinking Water
Distribution Monitoring
Secondary Chlorination

Free or Total Chlorine Measurement
Dual Sensor Technology Offers
Validation & Higher Confidence
No Stabilization Time Required
Significantly Reduced Maintenance
Ideal for Remote Site Monitoring

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Overview

Videos

Q & A

Specifications

Downloads

Overview

The HydroACT Hybrid Chlorine Analyzer initially utilizes the DPD method for immediate, accurate readings right out of the box. It then intelligently uses this data to selfcalibrate the electrochemical sensor once fully stabilized. The primary output then switches from the DPD to the stable electrochemical reading, and the DPD analysis reverts to a less frequent measurement interval
(e.g., once per hour). This operational strategy, combined with specially
developed, enhanced stability DPD reagents, extends the replacement
interval from monthly to once every six months.

This dual-sensor design provides self-checking validation and leverages
the best of both DPD and electrochemical sensors to deliver immediate,
continuous, accurate, and reliable chlorine residual readings. The Hybrid
Chlorine Analyzer comes pre-mounted on a backboard and includes
consumables for the first six months of operation.

dashboard

sensor screen

chart view

diagram screen

Videos

Case History – Auburn WTP Utilizes Chemtrac Chlorine Analyzers

Testimonial

A 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 Solutions

Testimonial

Chemtrac 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 Analyzer

Demonstration

The 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…

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HydroACT Animation

Demonstration

HydroACT is a versatile multi-parameter monitoring solution for water treatment processes. Key features include data logging, analog outputs, digital communications, and PID control. The systems are customizable and user friendly.

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Chemtrac Chlorine Sensor Assembly and Setup

Tutorial

Properly assembling the chlorine sensor is critical to the operation of the chlorine analyzer. This video demonstrates the appropriate way to set up the probe with the electrolyte,…

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Q & A’s

The Hybrid Chlorine Analyzer is a patented online chlorine analyzer that combines an advanced three-electrode electrochemical sensor with DPD colorimetry to deliver highly accurate and reliable chlorine residual measurements.

The analyzer starts by using the DPD colorimetric method for immediate, accurate readings, then uses those results to self-calibrate the electrochemical sensor once it stabilizes, after which the primary output switches to the continuous electrochemical measurement.

This dual approach provides self-checking validation, immediate and continuous readings, higher confidence in data, and extended reagent life, helping ensure robust disinfection monitoring with reduced maintenance.

Models are available for free chlorine (HA4-HYB-F) and total chlorine (HA4-HYB-T), with a measurement range of 0–5 ppm and a resolution of 0.01 ppm.

The DPD method can be configured to run at intervals from 2.5 to 100 minutes, and once the electrochemical sensor is calibrated, DPD typically runs less frequently (for example, once per hour), extending DPD reagent replacement from monthly to every six months.

Reagent and pump tubing are replaced every six months, while the cuvette and dosing head are replaced annually, which is significantly less frequent than many traditional DPD-only analyzers.

Manual calibration is not required for normal operation because the system self-calibrates using the DPD readings; manual calibration is only needed when regulations specifically require it.

The standard system includes one 4–20 mA output (expandable to four), with optional Modbus (TCP or RTU), Profibus, relays, and control modes such as PID, feed forward, flow proportional, and timer-based control.