Chlorine controller

Unlike ORP control, using free or total chlorine control can give precise readings of the actual hypochlorous acid or free (residual) chlorine content of the water being treated. Hypochlorous acid content fluctuates with changes in pH and regular ORP readings can give false impressions of the actual ‘effective kill’ of the chemicals being used.

The LDCL series pH-buffered chlorine controller accurately measures total or free chlorine from 0 to 200 mg/L (ppm), with probes to suit individual ranges of measurement for higher accuracies.

As hypochlorous acid converts into hypochlorite ion with an increase in pH, the ‘effective kill’ becomes significantly (approx 10 times) less effective.

Therefore, knowing the hypochlorous acid content of the water being treated can give early warning of either more chlorine being required, or to adjust the pH of the water being treated, if using pH control. This gives piece of mind to ensure that bacteria and viral colonies are controlled to specification.

Some advantages of this type of control are: cost saving as no pH control is necessary; one controller suits all chlorine probes; high accuracy measurements to ±0.01 mg/L (ppm) with pH control; analog mA retransmission for software monitoring systems; alarm contacts proportional or on/off control; and flow and level switch inputs.