223 > FOR GREATER COMFORT • For the comfort of bathers, the ORP level of the water must be between 600 mV and 750 mV; this is equivalent to about 1.0 mg/L free chlorine at pH 7.4 (variable depending on the stabiliser concentration). • To maintain optimum water quality, the pH regulation system (pH Expert) is the essential partner to the ORP regulation system. In this case the 'PODkit' will be the ideal option for a simple installation and accurate measurement. > SAFE, AUTO-ADAPTIVE OPERATION Depending on the ORP value measured by the sensor, Zodiac® ORP regulation systems will automatically adjust the chlorine level using a peristaltic dosing pump. The dosing time depends on the difference between the ORP value of the swimming pool water and the optimum value (set point value). The quantities of liquid chlorine injected are automatically adjusted to meet the demand for disinfection. Zodiac® ORP regulation systems are equipped with an exclusive overdosing safety device (called 'OFA') to prevent excessive injection. The safety device is adjustable and operates in 3 steps to determine whether or not it is necessary to inject liquid chlorine. DID YOU KNOW? ORP (and by extrapolation, the chlorine level) can vary depending on several parameters. For optimum treatment, 5 values must be met: • pH = 7.0 to 7.6 • TAC (alkalinity) = 8 to 15 °f (or 80 to 150 ppm CaCO3) • Cyanuric acid (stabilizer) < 30 ppm • Water temperature = 20°C to 28°C • Borehole water and rainwater prohibited It is essential to check and adjust these parameters, as necessary, to ensure optimum operation of the ORP regulation system. 50 % 20 % Example with a setpoint of 740 mV 100 % 75 % Dosing cycle time 10 min. 10 min. 10 min. 10 min. 75 % mV + 750 740 730 720 710 700 690 680 670 660 650 640 630 620 610 600 590 580 570 560 550 540 530 520 510 500 490 480 470 460 450 440 - EXCLUSIVE AUTO-ADAPTIVE DOSING ORP REGULATION SYSTEMS For automated chlorination Zodiac ORP regulation systems incorporate proportional dosing technology to maintain an ideal chlorine level automatically for the comfort of bathers. It uses the “ORP” method (also called Redox), otherwise known as measuring the “disinfectant capacity of the water”. AUTOMATIC WATER TREATMENT
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