6-Series

Multiparameter Sondes

6600 V2

6600EDS V2

6920 V2

6820 V2

600OMS V2

600XL V2 / 600XLM V2

600XL / 600XLM

600QS

600R

600LS

600DW

6920DW

650MDS

6500 Process Monitor

Anti-Fouling Solutions

6-Series Software

EcoWatch

AQUARIUS Time-Series

Streamline-ENV

All YSI Product Accesories - Sensors, Cables, Calibration Solutions & more...

Most Common

Ammonia/Ammonium

Blue-Green Algae

BOD (Biochemical Oxygen Demand)

Chloride

Chlorophyll

Conductivity

Depth

Dissolved Oxygen

Free Chlorine

Level

Nitrate

ORP / Redox

Photosynthetic Active Radiation (PAR)

pH

Resistivity

Rhodamine

Salinity

Specific Conductance

Temperature

Total Dissolved Solids (TDS)

Turbidity

Photometer Parameters

Professional Series

Handheld Instruments

Professional Plus
Multiparameter

ProODO Optical DO/OBOD

Pro20 Lab/Field DO

 

Classic Handheld Series

556MPS Multiparameter

550A Dissolved Oxygen

85 DO/Conductivity

63 pH/Conductivity

60 pH

52/58 Lab/Field DO

55 Dissolved Oxygen

30 Conductivity

Level Scout

Level Scout Level & Temp

 

Laboratory Series

5000/5100 BOD/DO

3200 Conductivity

3100 Conductivity

 

EcoSense

pH10 - pH Pen

pH100 - pH

ORP15 - ORP Pen

DO200 - DO

EC300 - Conductivity

9300/9500 Photometer

 

Aquaculture Systems

5200

YSI Systems

CastAway CTD

Buoys & Floating Platforms

EcoMapper AUV

EcoNet Data-to-Web

Vertical Profiling

Towed Underwater Vehicles

Underway Sampling System

Systems Integration

Other YSI Products

SonTek Acoustic Doppler Systems for water velocity

AMJ Environmental Custom Services

Design Analysis Associates WaterLog Series

YSI Life Sciences

Aquaculture

Coastal

Desalination

Estuary

Drinking Water

Groundwater

Laboratory

Oceans

Raw Water

Source Water

Storm Water

Surface Water

Wastewater

Watersheds / TMDL

Ask a Question

Events & Training

Find a Distributor

Product Service

Resource Library

Software Downloads

Welcome from the CEO

History

News

Career Opportunities

Environmental Stewardship

Sustainability Report

Quality

The YSI Foundation

YSI Incorporated
Find YSI on Facebook Follow YSI on Twitter Watch YSI on YouTube
Login | Register

Free Chlorine

Share |

Free chlorine, or hypochlorous acid, is a strong oxidant and the active species in most drinking water disinfection processes. For quality assurance, the chlorine concentration of treated water is often continuously monitored within the plant and throughout distribution pipelines.

Hypochlorus Acid Molecule, also known commonly as 'Free Chlorine'.  Green: Chlorine, Red: Oxygen, White:Hydrogen. Public Domain.
Hypochlorus Acid Molecule, also known commonly as 'Free Chlorine'.  Green: Chlorine, Red: Oxygen, White:Hydrogen. Public Domain. Hypochlorus Acid Molecule, also known commonly as 'Free Chlorine'.  Green: Chlorine, Red: Oxygen, White:Hydrogen. Public Domain. YSI Free Chlorine Sensor for drinking water measurement.YSI Free Chlorine Sensor for drinking water measurement.

Find a Distributor

YSI has Authorized Distributors all over the globe. View a map and find your closest contact for YSI Free Chlorine products and accessories.

Find a Distributor

Get Support

Have a question about your YSI Free Chlorine product? Check out the support page with resources compiled just for you.

Contact Technical Support

Product Service Centers

Want to return a product for service? Here you’ll find authorized service centers and instructions on how to send in your YSI Free Chlorine product.

Product Service

YSI 6920DW showing sensors, clockwise from top: pH/ORP, Temperature/Conductivity, Free Chlorine, Turbidity.
 

6920DW

Monitor Drinking Water in Distribution System

 

The YSI 6920DW is a portable instrument which measures free chlorine, turbidity, and other parameters. Take readings at multiple points along a drinking water distribution system; the collected data gives you a comprehensive view of your water quality and can help you detect events of concern.

 

YSI 600DW-B shown in profile with probe guard removed.
 

600DW

Sidestream measurements for distribution systems

 

The YSI 600DW is a portable instrument which measures free chlorine and other parameters. Take readings at multiple points along a drinking water distribution system; the collected data gives you a comprehensive view of your water quality and can help you detect events of concern.

 

There are currently no images related to free chlorine.

There are currently no videos related to free chlorine.

 

 

<< Back to Parameters page