ChlordioX Plus

  • CS400

The ChlordioX Plus offers unique sequential sensor technology for determining chlorine dioxide, chlorite and free chlorine - with USEPA approval.

Measuring chlorite is a regulatory requirement when using chlorine dioxide as a drinking water disinfectant and the ChlordioX Plus has been designed to provide full analysis and control for all samples including solutions containing free chlorine.

  • Simple sequential method without reagent or sample preparation – ideal for all users
  • Electrochemical measuring technique – no interference from sample colour or solids
  • Superb performance – report results with confidence.
ChlordioX Plus

The benefits of sensor technology

Sensor technology offers significant advantages compared to alternative measurement techniques. Simple measurement techniques coupled with state-of-the-art electronic instruments ensure even the lowest concentrations can be determined with confidence. Suitable for even the most difficult samples, the sensor technique is not affected by solids or sample colour.

Simple test method

Fill the sample container, insert the sensor and close the lid is often all that is required.

Waterproof USB connection

Download data sets for traceability and data management. These instruments also feature self-diagnostic functionality and automatic selection and performance of test methods.

Sensor Electrodes

At the heart of Palintest Sensor Technologies are the pre-calibrated, single-use, disposable electrodes incorporating a patented micro-electrode array. Reagents are embedded in the electrode, meaning no reagent preparation steps for the operator, and ensuring precise control of the measurement process is achieved in any situation.

The benefits of sensor technology
Simple test method
Waterproof USB connection
Sensor Electrodes


Measuring System Chronoamperometry
Ranges 0 - 50 mg/L chlorine dioxide, 0 – 10 mg/L free chlorine, 0 – 50 mg/L chlorite
Display High clarity LCD with backlight
User Interface English, French, Spanish, German and Italian language options
Connectivity USB-B
Data Storage 500 results including date, time, test ID and sample ID
Size (WxLxH) and Weight 170 x 126 x 116 mm, 975g (including batteries)
Power Supply 4x AA batteries


Select a consumable type to view details and download the related instruction and safety sheet documents for consumables


Additional Information

Part Code Contents
CS400 ChlordioX Plus instrument, USB cable, de-gasser assembly and battery operated pump, batteries, CDX sensors (x200) including calibration chip, CS sensors (x100) including calibration chip, glycine solution, CR-1 reagent, CR-2 reagent, sample bottle, stirring rods, Check Standards and instructions.
CS190 ChlordioX Check Standards
PT546 CR-1 Reagent (for chlorite test)
CR-2 Reagent (for chlorite test)
Glycine Reagent

Instructions & Brochures

ChlordioX Plus User Manual

Download the instrument instructions.


Sensor Technology Brochure

Download the Brochure to view the full range of Sensor Technology solutions.


Research & Insights

10 things you need to know about monitoring residual oxidants

​10 things you need to know about monitoring residual oxidants- a Palintest presentation at WWEM 2014


Chlorine alternatives in Fresh Produce production

Understanding your disinfectant – the switch from chlorine to chlorine dioxide in the production of fresh produce.


Chlorine Dioxide in Brewing Process Water

Rather than using traditional disinfectants which have long-lasting residuals and can form organic disinfection by-products, chlorine dioxide offers significant advantages for process water applications.


Free and combined chlorine - understand the difference

Testing the water for both free and combined chlorine allows you to know whether the water you've chlorinated is of sufficient quality to drink or disinfect your process, depending upon your application.


Methods for determining chlorine dioxide and its oxychlorine by-products in water

The analysis of chlorine dioxide and its oxychlorine by products in water is a difficult topic due to the volatility of chlorine dioxide and to the interferences from other species with standard test methods.


Testing biocides in hydraulic fracturing

Biocides are added to the water to prevent the build up of bacteria in the water that may lead to acid corrosion or the creation of sulphide based compounds. Bacterial growth can impair the production of oil and gas wells, and can be introduced into the fracking fluid from various sources including the source water and the proppant.


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