Boiler water level sensors
Marine boiler level differential pressure This boiler level measuring method uses a differential pressure measuring system with "wet leg".
Marine boiler level capacitance electrode An insulated electrode is placed in the boiler and the length should be sufficient to reach the water at all acceptable levels.
Marine boiler level conductivity electrode It's normally one boiler level electrode for emergency low water level alarm, or two electrodes if also high level alarm is required.
Marine boiler level float Boiler level float switches have been used for decades as level switches in boilers, but nowadays electrodes have replaced them.
Marine boiler level displacer A boiler level displacer (a float heavier than the water) is suspended to a spring balance by means of a stainless steel cable or a rod.