Municipal Drinking Water

Clean Drinking Water

Municipal Water Treatment - NSF61 Certified

Halogen Systems has found a better way to monitor chlorine in drinking water:

Our new 5 parameter sensor uses 3 electrodes for amperometric chlorine for accurate measurements. It is NSF61 Certified and can be installed directly in a pipe. Halogen’s sensor is unlike any other sensor on the market today. 

This versatile sensor can be installed in a flow cell, directly in a pipe, or even immersed direct in a tank or channel. Simple installation and low cost of operation.

Downloadable Brochure
To Download Please Enter Your Name & Email:

Our Analyzer Measures

  • Free or Total Chlorine
  • pH
  • Conductivity
  • Temperature
  • ORP

Installation Details

  • Easy Install
  • Installed directly in wet tap valve, side stream or immersion.
  • Submersible Immersion mounting options
  • Can be over one hundred feet from monitor or SCADA input
  • Display connects to up 5 sensors
  • Connects directly into a SCADA (Supervisory Control and Data Acquisition) system suing Modbus RTU.
  • 24VDC or 90 to 240 VAC operation

Our Chlorine Sensors Unique Features:

  • Low maintenance – self-cleaning.
  • No reagents
  • Flow independent – not affected by pressure fluctuations or flow changes.
  • No membranes or electrolyte
  • No waste stream required
  • Low drift – calibration stable for many months
  • Factory calibrated.

Amperometric Chlorine Analyzer - low maintenance

Flow Independent Measurement

Our Chlorine sensor is unaffected by flow velocity changes from 0 to 12 f/s. (HSI 06, 2020). This sensor style has an integrated pump, which uses a long-life brushless motor to deliver a fixed velocity across the electrodes, creating flow independence. The high velocity flow across the electrodes also improves sensitivity and improves the Signal to Noise Ratio.

Ease Of Service

A Wet Tap installation method enables direct insertion into a distribution pipe. The highly integrated design reduces the electronics cost and size, while increasing reliability.

Self-Cleaning Amperometric Chlorine Sensor

An electrochemical cleaning method resists polarization and adsorption of organics.  Cleaning beads continuously clean the sensor. This keeps the electrode surfaces, including the pH sensor, free from buildup of hardness and biofouling. Solid metal electrodes last the life of the system.

These features combine to enable long intervals between calibration. In freshwater tests, calibrations were stable for more than 3 months.

Reduced Cost of Ownership


Direct Pipe Insertion Amperometric

Old Technology Amperometric

Not Affected by Flow



Direct insertion



No Membranes



No Waste stream






High Pressure pH Sensor



Includes pH Compensation



Calibration or service (months)

6 to 12



Halogen Sensor


Reagent cost***



Water cost*  **



Wear Parts






Halogen Savings Annually



* $900 acre/foot water cost (MWD 2018)
**500 mL DPD water Flow Rate (69,204 gallons per year)
***Reagent cost $61.29 per package

The Details

Better Information & Additional Parameters

This multiparameter sensor measures four other parameters in a single compact package. These measurements provide the utility with information far beyond the free chlorine level. There is no need for recalibration under changing water conditions.

Discrete sensor systems with a similar number of parameters often cost five or six times as much.


All these parameters mentioned below are transmitted via the Modbus communication protocol. An optional local Display is available for viewing parameters, troubleshooting and calibration

Amperometric Free or Total Chlorine

Free chlorine is measured every 45 seconds. The readings are pH, temperature and conductivity compensated.

Integrated pH Sensor

Two-year life versus the industry average of six months. This sensor cartridge is an integral part of the sensor and continually cleaned. This unique pH sensor can tolerate pressures up to 200 PSI. The pH sensor does not need frequent calibration.

Oxidation Reduction Potential (ORP)

Measuring ORP in drinking water provides another indicator of possible contamination or piping failure. This unique method of measuring ORP keeps the electrodes clean.

Integrated Conductivity Sensor

Changes in conductivity are important to water utilities and can indicate contamination, a pollution event, or other problems.

Types of Install

MUNICIPAL Water Chlorine Sensor Application

Side Stream

The side stream version of the sensor can be installed for either temporary or permanent monitoring of water treatment branches.  The sensor requires only a small flow of 0 to 0.5 GPH for operation. 

In Tank Installation

Since the sensor does not require any flow, it can be installed in a tank.

Immersion Installation

Open channel installation with a boom.

Power Options

Several power options are available.

  • 120V AC
  • 24 VDC power from a SCADA system
  • Remote power, battery, and solar panel

Click below to visit our other site to learn more about our Municipal Water Treatment & Wastewater analyzers