Free and total chlorine and pH photometer: Range Free Chlorine: 0.00 to 2.50 mg/L, Total Chlorine: 0.00 to 3.50 mg/L, pH: 5.9 to 8.5 pH
- CAL Check™ allows for performance verification and calibration of the meter using NIST traceable standards
- Auto shut-off
- Built-in timer - Display of time remaining before a measurement is taken
Free and total chlorine and pH photometer: Range Free Chlorine: 0.00 to 2.50 mg/L, Total Chlorine: 0.00 to 3.50 mg/L, pH: 5.9 to 8.5 pH.
Significance of use
Three critical parameters that can be tested to ensure good water quality are pH, free chlorine, and total chlorine. Chlorine is one of the most commonly used disinfectants for drinking water, wastewater, and water used for pools and spas. It can be added to in various forms including calcium hypochlorite, sodium hypochlorite, or in some instances, chlorine gas. When added to water, chlorine creates hypochlorous acid (HOCl) which dissociates into hypochlorite ion (OCl-).
HOCl is the form of chlorine that acts as a stronger disinfectant as compared to OCl-. To ensure the added chlorine is effective at sanitising, the pH of the water must be taken into account. Around pH 7.5, HOCl and OCl- are present in relatively equal amounts. Below pH 7.5, the equilibrium shifts to favour HOCl. Above pH 7.5, the equilibrium shifts in favour of OCL-. Depending on the application, addition of chlorine is effective when added to water with a neutral or slightly acidic pH value.
When chlorine is first added to water, it is available as free chlorine. The measurement of free chlorine signifies the amount available for disinfection. Once chlorine begins to sanitise bacteria and pathogens present in the water, it becomes combined chlorine. Combined chlorine is no longer available to act as a disinfectant. The measurement of total chlorine signifies the amount of free chlorine and combined chlorine. With both free and total chlorine measurements, a drinking water operator or pool owner can determine if there is enough chlorine available for disinfection.
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