Logic is a series of electronic pressure switches that will control and protect an electric pump. They will start a pump immediately when a valve in the pipe system is opened and stop the pump immediately when the valve is closed. They maintain a constant system pressure, protect a pump from dry running and reduce the effects of water hammer. They are fitted with non-return valves and have a simple user interface for system status and re-set. They can be fitted to any surface mounted pump, or in the delivery line of any submersible, that operates within the rated pressure and flow and motor specifications. There are seven models in the range, which are manufactured by Trevitech of Italy, who also produce the Watertech models Presscontrol, Presscontrol TIME and Mascontrol.