 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. When the displacer is semi-submerged the weight of the displacer
changes when the water level varies and the change in weight is converted into
a level signal that corresponds to the level in the boiler. 0% of water in the
level glass correspond to 4 mA (3 psi) and 100% corresponds to 20 mA (15 psi).
This level measuring method is not so very common onboard ships since the
measuring result is very influenced by the ship’s movements. A shore, on the other hand, Boiler level
displacer transmitter works very well. At an oil refinery you will find lots of
level displacer transmitters, for water levels as well as petroleum product
levels.
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