Chlorine Analysers For Residual Chlorine Monitoring – HypoSense
What is the best way to monitor the chlorine content of bleach online?

Chlorine in Bleach Sensor
- Easy to install – the HypoSense is an optical measurement where light is shone into the sample and the amount of light absorbed is proportional to the amount of chlorine in the sample. This means that it is easy to install inline in a flow through fitting.
- Easy to use – for processes that require knowledge of the chlorine level in bleach such as in the Monochloramine (MCA) manufacture, the HypoSense is easy to use and get the best possible control, allowing the user to match the hypo dose to the MCA ammonium precursor using feed forward control available in the CRIUS®4.0.
- Easy to own – any process requiring a known amount of chlorine in sodium hypochlorite can benefit from a HypoSense. With calibration done via the front panel of the CRIUS®4.0, with temperature compensation built in and with no user serviceable parts, the HypoSense is particularly easy to own.
OCl– absorbs light at a particular wavelength with the amount of absorption being inversely proportional to the concentration.
This is true of all light absorbing chemicals in water and is described by Beer Lamberts Law.
In HypoSense a light is transmitted through the sample and the less light that reaches a detector at the other side from the light source, the higher the concentration of chlorine in the sample. The addition of inbuilt temperature compensation provides for enhanced accuracy when temperatures vary.
Chlorine in Sodium Hypochlorite Sensor 0-16%
- Low purchase cost
- Low cost of ownership
- Stable and reliable
- Bufferless
- Reagentless
Need help with an application? Click here!
- Continuous online monitoring for chlorine in industrial bleach
- Feed forward control in the manufacture of Monochloramine (MCA)
- End point control in the manufacture of Sodium Hypochlorite
When coupled with the CRIUS®4.0 controller, with its remote access and built-in control capabilities, the HypoSense becomes an extremely powerful tool.
Sodium Hypochlorite is chemical NaOCl or NaClO. It is an unstable chemical that is normally stabilised with Caustic Soda or NaOH.
Bleach is the common name given to Sodium Hypochlorite. It is most commonly used in disinfection processes.
Industrial bleach is a solution of sodium hypochlorite and sodium hydroxide typically with up to 16% active chlorine.
Industrial bleach decays over time and so the amount of chlorine in the bleach changes.
Yes. Many sensors are affected by temperature and the HypoSense is no exception. Temperature is measured inside the sensor and the compensation is applied in the sensor ensuring the best measurement possible.
This depends on the application. The online chlorine sensor has a very low drift so most people calibrate it either once a week, once a month or even every six months.
Typically no maintenance is required as the bleach keeps the sensor clean, however in very dirty bleach it may be necessary to clean the sensor occasionally.
Yes. It is really important to mount the flow path vertically. In this orientation, any bubbles get dislodged by the flow of the sample.
Document | Type | Size |
---|---|---|
HypoSense | Brochure | 762kB |
"We at Scottish Water have been using the excellent Pi LabSense 3 and portable UV254 instruments in the field for optimizing our Water Treatment processes for some years now. We find them easy to use and invaluable for detecting and resolving issues in a timely, efficient and effective manner. Two great pieces of kit!”
Paul Weir
Scottish Water - UK
"I want to thank you and all at Process Instruments for all the assistance, information and handholding during the year. The help that was so freely given was very much appreciated. Can you please extend my appreciation to all at Pi and let me wish you all a happy, safe and wonderful Christmas and I look forward to working with you again in 2021."
Michael Bailey
Wexford Co. Co. - Ireland
"Excellent level of support and always so much more prompt than a lot of our suppliers."
Phill Tuxford
Detectronic - UK
"The plant can’t produce good quality water without the CoagSense."
Mick Murphy
Wexford Co. Co. - Ireland
"We've used the CRIUS® with chlorine, pH and conductivity sensors for several years and confirm quality, performance and reliability has been wholly satisfactory to date."
David Kerr
Karis Technical Services Ltd. - UK
"We in ECM ECO Monitoring can only recommend Process Instruments products and services to all other potential clients. They have very complex portfolio of products for water quality monitoring in various types of industries, friendly attitude, very quick delivery time and prompt reaction to all our needs and inquires. Our clients especially appreciate the particle counters and sizers allowing identification of drinking water treatment problems. The Streaming Current Monitors are a great tool for optimisation of expensive chemicals.”
Branislav
ECM ECO Monitoring - Slovakia
"Simply the best turbidity available."
John Clark
Chemtrac - Atlanta, GA
"In 2019, we purchased 29 particle counters which were installed in our water plants. So far, their performance has been perfect."
Li Yongjun
Jinan Hongquan Water Company - China
"We have installed hundreds of ozone analyzers from Pi over the years. They are just accurate, reliable and require low maintenance."
Jiao Tumei
Qingdao Guolin Environmental Technology Co., Ltd., - China
"Over the last few years we've purchased chlorine and turbidity analyzers from Chemtrac and with routine calibration the probes measure the chlorine and turbidity without any issue. We are very happy with this product and would highly recommend them."
Daniel "Buck" Owen
Ocoee Utility District - Ocoee TN
"We've been using these analyzers since 2008. They're easy to use and very stable. Calibration and maintenance is quick and simple."
Lloyd Gruginski
Chehalis WTP - Chehalis, WA
"The Pi products provide excellent value for money and represent the best municipal drinking water analyzers available."
John Clark
Chemtrac - Atlanta
“Servicing customers is much more than just solving problems or addressing complaints and Pi does that very competently with technical and quick efforts providing a good experience."
Clovis Tuchapski
Buckman - Latin America
"Pi's technical team has enabled us to be one step ahead of our competitors by adding value to our projects thanks to their fast and excellent support from the moment you first reach out.
Ibrahim Kaplin
Thermomed - Turkey
"Going from ORP control to amperometric chlorine sensor control has undoubtedly improved the pool water immensely!"
Chris Tedeschi
Link Automation - USA
"The Streaming Current Monitor from Pi is the best SCM I have ever used. The analyser responds quickly and has many powerful functions, which helps me save a lot of money."
Ye Yancong
Xiamen Xishan Water Plant - China
“Process Instruments has a broad range of high quality and user-friendly solutions for water-industry problems. The short lead times and great customer support make Pi a reliable partner.”
Péter Szabó
SC KATALIN NOHSE CHIMIST IMPORT SRL - Romania
"Process Instruments UK always have a high level of customer service. All our interactions with Pi have exceeded our expectations. It is always a pleasure working with you.”
Iñaki Seisdedos Rodríguez
Izasa Scientific - Spain
"The support from Pi and its partners is superb. They go above and beyond to ensure that, not only is their equipment perfect but that the process is working great too. Five Stars!"
Anthony Glitto
Equip Solutions - Illinois, USA
"Process Instruments UK always have a high level of customer service. All our interactions with Pi have exceeded our expectations. It is always a pleasure working with you.”
Rudi Tuffek
Allpronix - South Africa