The Levelstate Electronic Level Switch – ELS 300+ is an alternative to the Float Level Switch for steam / water applications, providing a significant improvement in reliability and safety, reduced
installation and maintenance costs.

Applications include the detection of water in turbine steam extraction lines, level alarms and tripping circuits for feed water heater and high security low-water cut-off for boilers.

The discrimination between water and steam is based on the significant difference in resistivity between the two states over the saturation range. The sensing element is a probe with an insulated tip, inserted in housing assembly (Fig. 1.1) or standpipe, which protrudes into the required sensing location. If a voltage is applied to the tip and it senses water, conduction occurs between probe tip and inside wall of the insert assembly. The level of conduction is electronically detected to initiate relay action.