Residual Chlorine Analyser | Free Chlorine Analyser

By: Process Instruments  11-11-2011
Keywords: Internet Access, Remote Access, Flow Switch

"The Residual Chlorine Analysers from Pi are the best we've ever used" Dr Lester Simmonds, UK

The HaloSense range of Residual Chlorine Analysers are used in many applications requiring the measurement and control of residual chlorine levels.

The HaloSense free chlorine analyser is suitable for chlorine monitoring or chlorine control applications.

A range of residual chlorine analysers using the HaloSense chlorine sensors means that you get exactly what you need and nothing that you don't. From a low cost no-frills chlorine controller (CRONOS) to a colour touch screen, remote access chlorine controller (CRIUS) - and all with the same great sensors!

Residual Chlorine Analyser Key Benefits

  • Low cost of ownership
  • Reduced pH dependency
  • Stable and reliable
  • Free chlorine analyser
  • Total chlorine analyser
  • Combined chlorine analyser
  • Bufferless chlorine analyser
  • Reagentless chlorine analyser

New! CRATOS HaloSense Residual Chlorine Analyser is now available with up to 12 chlorine sensor inputs, reducing the cost per point. Chlorination control is now simpler and cheaper than ever!

pH Compensation

For some applications with high and variable pH, pH compensation can improve the accuracy of the chlorine analyser. For pH compensation to be valid it must be done with the highest quality pH sensors and with chlorine sensors that have a reduced susceptibility to varying pH, such as those used in the HaloSense range of residual chlorine analysers.

  • High Quality and Multilingual
  • Lowest Purchase Cost
  • Up to 3 sensors

Options include:

  • pH compensation
  • optical isolation for I/O
  • up to 3 4-20mA outputs
  • up to 4 relays (solid state or mechanical)
  • modbus TCP
  • modbus ASCII/RTU
  • profibus
  • HART
  • flow switch input
  • PID control
  • High Quality and Multilingual
  • Low Cost
  • Colour Display and Keypad
  • Sophisticated Comms and Control

All CRONOS options plus:

  • texting alarms
  • remote internet access
  • datalogging
  • PID control
  • automatic cleaning
  • automatic calibration
  • up to 6 sensors and outputs
  • High Quality and Multilingual
  • Medium Cost
  • Colour Touchscreen
  • Up to 12 Sensors

All CRONOS and CRIUS® options plus:

  • up to 12 sensors
  • lowest cost per point

Autoflush

Residual Chlorine Analyser Applications

"I've bought more than 100 chlorine analysers from Pi and I think they're great!" John Clark, USA

  • Continuous chlorine monitoring
  • Water treatment plant residual chlorine control
  • Secondary chlorination free chlorine control
  • Distribution monitoring
  • Cooling tower chlorine monitoring and control
  • Pasteuriser dosing control
  • Seawater chlorination control
  • Chlorine monitoring in seawater

Anywhere you have a requirement to measure residual free or total chlorine is a suitable application for the HaloSense. The HaloSense chlorine analyser range is particularly suited to working in sites where reliability and ease of use are most important.

Principle of Operation

The membraned amperometric chlorine sensor is enhanced with a third, reference, electrode which eliminates zero drift. pH correction is often not required at all. (NB. These chlorine sensors are often known as polarographic chlorine sensors although this is a misuse of the word polarographic). Its unique design means that pH correction is not usually required at all, completely eliminating reagents.

In addition to the state of the art potentiostatic chrono-amperometric free chlorine and total chlorine sensors, the HaloSense range of residual chlorine analysers has all the functionality that you need, and more. Simply choose the CRONOS, CRIUS® or CRATOS chlorine analyser / chlorine controller to give you the highest quality chlorine analyser, with all the functionality you need at the lowest price possible. This means that you pay for everything that you need and nothing you don't, without sacrificing the quality of measurement!

The chlorine sensors used by the HaloSense chlorine analysers are largely pH independent meaning that the measurements are bufferless and reagentless. They are amperometric chlorine sensors and show remarkable sensitivity and stability. For those making a chlorine measurement at high pH (>pH 8.5) on variable pH water it is possible to provide pH compensation from either a pH sensor connected to the analyser or from an external pH meter.

The sensors work by seperating the electrodes that perform the measurement from the sample, by a membrane. This membrane allows the free residual chlorine (HOCl and OCl-) or the total residual chlorine (HOCl and OCl- plus chloramines) through the membrane. Inside the sensor the residual chlorine meets the electrolyte which is at a low pH. This converts the majority of the OCl- to HOCl. The HOCl is reduced at the gold working electrode and the current generated is proportional to the Free Chlorine or Total Chlorine present, and the instrument gives a reading in ppm or mg/l.

This technique is the most advanced method of continous measurement and has many benefits to the user including a very stable chlorine measurement and better dosing control.

The HaloSense Residual Chlorine Analyser is bufferless and reagent free, meaning it has a low total cost of ownership and with maintenance intervals at 3 or even 6 months, the HaloSense bufferless chlorine analyser is fast becoming the instrument of choice for the engineer who wants the best analyser at the best price.

The CRONOS, CRIUS® and CRATOS Free and Total Residual Chlorine Analysers are equipped with process control options, datalogging, relay outputs, serial comms, (TCP, Ethernet, Modbus and Profibus are available on all chlorine analysers). Remote Access of the chlorine monitors (including remote access to all control options) is available via the internet, and via a LAN. In fact the CRIUS® HaloSense chlorine analysers have all the options you could want in a chlorine analyser or controller whilst the CRONOS maintains a low cost and is particularly great value for money!

Keywords: Colour Display, Flow Switch, Internet Access, Ph Sensors, Remote Access, Remote Internet Access, Residual Chlorine, Residual Chlorine Analyser, Residual Chlorine Analysers,

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