| 摘要 |
<p>A method and an installation for checking and automatically adjusting the proportion of chlorine in a water system. First the pH value of the water is measured and corrected if necessary by dosing with an additive. Then the proportion of chlorine is measured and a chlorinating agent dosed in as necessary. Pref. the installation comprises a sensing cell contg. four electrodes immersed in water of the system to be controlled. The electrodes include one reference electrode, one for pH potential, one for chlorine potential and a thermistor for temp. correction. Signals from the electrodes are amplified and switched in sequence by a multiplexer to a microprocessor equipped with random access memory (RAM). The microprocessor compares pH and chlorine readings with predetermined set values keyed into the memory. The water system is automatically dosed with corrective additives. Pref. a reference voltage is available to the multiplexer for checking the logic of downstream circuits. The method and installation are for controlling the level of chlorination in water systems, partic. swimming baths. The method is much more accurate than previous chlorination methods which did not adjust pH and compensate for temp. variations.</p> |
