Closed amperometric cells with a dedicated cell for each disinfectant, from chlorine to ozone. The models with a selective membrane measure only the specific oxidant, without interference from other substances; the SCL17 and SCL18 cells, with three electrodes and no membrane, are self-cleaning and intended for hot water.
In cold water (SCL3N, SCL3S) and in domestic hot water (self-cleaning SCL18). On SCL3N and SCL18, automatic pH compensation keeps the measurement accurate and reliable even between pH 6 and 8, where free chlorine tends to dissociate into hypochlorous acid and hypochlorite ion.
Measurement of total chlorine, that is the sum of free chlorine and combined chlorine.
In cold water (SCL2) and in domestic hot water, including for Legionella control (self-cleaning SCL17).
Continuous measurement of bromine in swimming pools, spas and cooling towers.
Measurement of hydrogen peroxide in disinfection and Legionella control treatments.
Continuous measurement of peracetic acid (PAA) in process and washing water.
Continuous measurement of dissolved ozone in drinking water, process water and swimming pool water.
Measurement of chlorites, a by-product of chlorine dioxide, to verify compliance with the limits set for drinking water.
The cell consists of an electronic section and a galvanic section.
Insight: Redox, open cell and closed cell →The measuring electrodes are protected from direct contact with the water by a semi-permeable membrane: only the specific oxidant is measured, without interference from other substances that could alter the measurement.
The electrodes of the galvanic section detect the electric current generated by the dissociation of the oxidant.
The cell electronics compensate the reading for temperature (and, where applicable, pH) and send the signal to the controller, which shows the concentration in mg/l on the display.
For Legionella control systems and cooling towers, SCL18 (free chlorine) and SCL17 (chlorine dioxide) are available.
Legionella: risks, regulations and treatments →
The cell has no semi-permeable membrane and features three measuring electrodes; it operates from 5 to 70 °C and up to 8 bar.
The balls, moved by the water flow, contribute to the polarisation of the electrodes and keep them free from deposits.
All cells use the amperometric measuring system.
| SCL3N/0.5 | SCL3N/2 | SCL3N/20 | SCL18/0.5 | SCL18/2 | SCL18/20 | SCL3S/20 | |
|---|---|---|---|---|---|---|---|
| Measuring range | 0 – 0.5 mg/l | 0 – 2 mg/l | 0 – 20 mg/l | 0 – 0.5 mg/l | 0 – 2 mg/l | 0 – 20 mg/l | 0 – 20 mg/l |
| Resolution | 0.001 | 0.001 | 0.01 | 0.001 | 0.001 | 0.01 | 0.01 |
| Free chlorine | Inorganic | Inorganic | Inorganic | Inorganic | Inorganic | Inorganic | Organic and inorganic |
| Water | Fresh | Fresh | Fresh | Fresh | Fresh | Fresh | Fresh or salt |
| Electrodes | 2 | 2 | 2 | 3 | 3 | 3 | 2 |
| Selective membrane | Yes | Yes | Yes | No | No | No | Yes |
| Automatic compensation | pH and temperature | pH and temperature | pH and temperature | pH and temperature | pH and temperature | pH and temperature | Temperature |
| Self-cleaning | – | – | – | Yes | Yes | Yes | – |
| Operating pH | 5 – 9.5 | 5 – 9.5 | 5 – 9.5 | 5 – 9 | 5 – 9 | 5 – 9 | 5.5 – 9.5 |
| Operating temperature | 1 – 40 °C | 1 – 40 °C | 1 – 40 °C | 5 – 70 °C | 5 – 70 °C | 5 – 70 °C | 5 – 45 °C |
| Operating pressure | 1 bar | 1 bar | 1 bar | 8 bar | 8 bar | 8 bar | 1 bar |
| Water flow | 30 l/h | 30 l/h | 30 l/h | 40 l/h | 40 l/h | 40 l/h | 30 l/h |
| SCL2/0.5 | SCL2/2 | SCL2/20 | SCL17/0.5 | SCL17/2 | SCL17/20 | |
|---|---|---|---|---|---|---|
| Measuring range | 0 – 0.5 mg/l | 0 – 2 mg/l | 0 – 20 mg/l | 0 – 0.5 mg/l | 0 – 2 mg/l | 0 – 20 mg/l |
| Resolution | 0.001 | 0.001 | 0.01 | 0.001 | 0.001 | 0.01 |
| Electrodes | 2 | 2 | 2 | 3 | 3 | 3 |
| Selective membrane | Yes | Yes | Yes | No | No | No |
| Self-cleaning | – | – | – | Yes | Yes | Yes |
| Operating pH | 1 – 6 | 1 – 6 | 1 – 6 | 5 – 9 | 5 – 9 | 5 – 9 |
| Operating temperature | 1 – 40 °C | 1 – 40 °C | 1 – 40 °C | 5 – 70 °C | 5 – 70 °C | 5 – 70 °C |
| Operating pressure | 1 bar | 1 bar | 1 bar | 8 bar | 8 bar | 8 bar |
| Water flow | 30 l/h | 30 l/h | 30 l/h | 40 l/h | 40 l/h | 40 l/h |
Automatic temperature compensation on all models.
| SCL8/2 | SCL8/20 | SBR/20 | SCL9 | SCL11/200 | SCL11/2000 | SCL10 | SCT | |
|---|---|---|---|---|---|---|---|---|
| Measurement | Total chlorine | Total chlorine | Bromine | Hydrogen peroxide | Peracetic acid | Peracetic acid | Ozone | Chlorites |
| Measuring range | 0 – 2 mg/l | 0 – 20 mg/l | 0 – 20 mg/l | 0 – 200 mg/l | 0 – 200 mg/l | 0 – 2,000 mg/l | 0 – 20 mg/l | 0 – 2 mg/l |
| Resolution | 0.001 | 0.01 | 0.01 | 0.1 | 0.1 | 1 | 0.01 | 0.001 |
| Operating pH | 4 – 12 | 4 – 12 | 6.5 – 9.5 | 1 – 11 | 1 – 6 | 1 – 6 | 2 – 11 | 5.5 – 9.5 |
| Operating pressure | 1 bar | 1 bar | 0.5 bar | 1 bar | 1 bar | 1 bar | 1 bar | 1 bar |
All models: 2 electrodes, selective membrane, automatic temperature compensation, operating temperature 1 – 40 °C, water flow 30 l/h.
Tell us the oxidant to be measured and the characteristics of the system: we will recommend the most suitable cell and controller.
Call or write to us: a technician will reply with a tailored proposal of controllers, pumps, probes and accessories.