The TDS control system limits the level of salts and minerals dissolved in the boiler water within the value allowed by the manufacturer thus avoiding any risks of carry over due to excessive levels of salinity and minimising the required blowdown volume and the relevant costs. The system makes measurements continuously, just below the evaporation surface. The electrical conductivity of boiler water, whose value is related to dissolved salts concentration, is compared with the set value. If this value is higher, the blowdown valve opens until the value drops below the setpoint.
