Roto Pumps Ltd. Offers Dry Running Protection Device. Roto Pumps Ltd. Is an ISO 9001-2000 certified company. The Dry Running Protection Device is used to prevent the stator damage due to dry running specially developed temperature sensor is screwed into the stator wall to monitor the operating temperature. If by any chance the pump runs dry then the stator temperature increases, this time Dry Running Protection Device switch off the pump at pre set temperature.