Chlorine Analyser – HaloSense

Chlorine analysers from Pi are used in many applications requiring the measurement and control of online residual chlorine levels in water. The HaloSense range is suitable for total or free residual chlorine monitoring or control applications in potable water, seawater, process water, swimming pool water, waste water, food washing, paper and pulp, etc.

Chlorine Analyser
Chlorine Analyser

The following are available in the HaloSense range;

  • Online free chlorine 0.005-2ppm, 0.05-5ppm, 0.05-10ppm, 0.05-20ppm, 0.5-200ppm
  • Online total chlorine 0.005-0.5ppm, 0.005-2ppm, 0.05-5ppm, 0.05-10ppm, 0.05-20ppm
  • Online residual chlorine in seawater analysers (free or total bromine) 0.005-2ppm, 0.05-5ppm, 0.05-10ppm, 0.05-20ppm
  • Online zero chlorine (designed to measure the absence of free chlorine) 0.005-2ppm for applications such as post activated carbon and pre-RO monitoring.

The HaloSense range of controllers/transmitters means that you get exactly what you need and nothing that you don’t. From a low cost no-frills chlorine dosing controller (CRONOS®) to a highly sophisticated colour display, remote access controller (CRIUS®) – and all with the same great sensors! Chlorine dosing control is now simpler and cheaper than ever! Both instruments can have multiple sensors and multiple sensor types, saving money on the requirement for one sensor and one transmitter per measurement.

Free Chlorine AnalyserFree Chlorine Analyser

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

The free chlorine sensors used by the analysers are largely pH independent meaning that the measurements are bufferless and reagentless. They are amperometric sensors and show remarkable sensitivity and stability. For those needing to measure chlorine 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 transmitter or from an external pH meter.

The sensors work by separating 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 dissolved 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 chlorine present, and the instrument gives a reading in ppm or mg/l.

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

The HaloSense range is bufferless and reagent free, meaning that it has a low total cost of ownership and with maintenance intervals of 1 year. HaloSense is fast becoming the instrument of choice for the engineer who wants the best instrument at the best price.

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