differential switch

differential switch There is virtually no doubt that interest in this particular circuit will increase as the price of elec- tricitY — and of energy in general — continues to rise. The differential switch is able to measure the difference in temperature between two points and, depending on the temperature difference, it will switch a relay on or off. The relay can then be used, for example, to activate a circulation pump. There are numerous applications for the circuit. It can be used in combination with solar heating panels or solar collectors and it can also be used to control the pump in central heating systems. In the latter case, one sensor is placed in the return pipe while the other is situated in the hot water outlet pipe close to the boiler. As soon as the boiler switches on, a temperature difference is created and the pump also switches on. The attractive feature of this design is the fact that both the temperature difference and the hysteresis independently, so that...