Hydrastep consists of a number of electrodes installed within a water column attached to the boiler. The electrodes are positioned above and below the water level and a step change in resistance between two adjacent electrodes identifies the water level.
Its works on the principle of resistivity. The discrimination between water & steam is based on the significant difference in resistivity between the two states over the saturation range.when a voltage applied to the tip,conduction takes place between tip and inside wall of column.when the resistance of probe is less than 100K its represents the water % in drum and if it is greater than 100K its represents the % steam in drum.
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