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Fluid interface detection safety switch

Petroleum engineers responsible for the process of separating crude oil, gas and water will find the SIL2 rated FlexSwitch FLT93S Flow/Level/Temperature Switch from Fluid Components International (FCI) provides precision interface detection of fluids to manage separation tank operations.

With its advanced thermal dispersion sensing technology, the FLT93S Switch ensures accurate interface detection of oil, gas and water and performs monitoring, controlling and alarming of flow rates or levels of critical fluid layers in tanks such as emulsion layers, foams, liquids and slurries.  

With its rugged industrial design and housing, the FLT93S Switch features superior reliability rated to SIL2 and a long service life under the harshest petrochemical industry conditions.  

The FLT93S Switch is a dual-function insertion-style instrument that offers either flow/temperature sensing or level/temperature sensing in a single device. 

A single FLT measures and monitors flow or level and temperature simultaneously with excellent accuracy and reliability.  Dual 6A relay outputs are standard and are assignable to flow, level or temperature.  

Unlike density displacers, which are often used for level and interface control, the FLT93S Switch relies on the specific heat transfer properties of the media to identify the interface of different products.  

With its thermal dispersion sensing capability, the FLT93S monitors the interface of products with similar densities for highly reliable control in separation tanks and other vessels.

The Switch’s dual switch point option allows one instrument to control two different product interfaces.  Two or more switches are used to control product discharge and intake at specified points.

The FLT93S operates over a wide set point range in hydrocarbon liquids from 0.003 to 1.5 mps, in gas/air from 0.08 to 37 smps and in water from 0.003 to 0.9 MPS. Level/interface accuracy is ±6.4 mm, and measurement repeatability is ± 3.2 mm.

The standard FLT93S withstands operating temperatures from -40 to 177°C, and an optional configuration is available for temperatures from -73 to 454°C. 

A wide selection of process connections is available for the FLT93S. The electronic control circuit can be integrally mounted with the sensing element, or it can be located in a remote location. The standard enclosure is made from a coated aluminium alloy. It is suitable for use in ATEX locations and is rated for NEMA Type 4X (IP66) environments.  Stainless steel or fiberglass enclosures also are available.  


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