Series 7700 Displacer Operated Double Stage Level Controls
The 7700 series Displacer operated level controls are the ideal solution for liquids that are turbulent, viscous, foaming or muddy etc. Instead of using a conventional float, these instruments use displacers that can be positioned anywhere along the suspension cable. The devices are equipped with two switch mechanisms and are available with narrow or wide switching differential.
The narrow range models, fitted with two displacers, are factory set to work with a fixed differential that is slightly variable according to the density of the liquid, while the switching levels for each stage can be easily adjusted by changing the position of the displacers along the suspension cable.
The wide range models are equipped with three displacers, which can operate in various combinations; by changing the position of the displacers along the cable, both the switching level and
differential width setting for each stage can be adjusted. The connection to the tank, in carbon steel, can be screwed 3” NPT or flanged (3” ANSI 150 RF as standard). The displacer spring is in Inconel and is enclosed in an AISI 316 housing (with a diameter of about 73 mm) placed below the tank connection.
The devices come as standard with displacers in porcelain or in AISI 316 L (see table below) and with a 3-metre AISI 316 suspension cable.
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