Flow Switches

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Flow Switches for Liquid, Air, Gas Applications in Industrial Processes and Plant Operations

FCI flow switches feature thermal dispersion technology in which the temperature difference is greatest in a no-flow condition and decreases as flow increases, cooling the heated RTD. Changes in flow velocity directly affect the extent to which heat dissipates and, in turn, the magnitude of the temperature difference between the RTDs.

An electronic control circuit converts the RTD temperature difference into a conditioned DC voltage signal. These signals are used to drive adjustable-setpoint alarm circuits and outputs. Depending on the model, alarms are field configurable for flow, temperature, high or low, hysteresis, time delay and more. FCI offers a broad range of flow switch products to meet a wide range of performance and application requirements. FCI flow switches are rugged, reliable and repeatable to ensure continuous operation and longest service life in industrial applications. An extensive selection of flow element materials, process connections and enclosures are available to ensure compatibility and easiest installation in your process.

  •  FLT93 Series: Ultra Rugged, High Performance Flow and Temperature

Model Type Application
FLT93S Flow Switch Insertion  All Liquids and Gases
FLT93F Flow Switch Insertion  Fast Response, Air and Gas
FLT93B Flow Switch Insertion  Fixed Configuration of FLT93S for Quick Delivery
FLT93L Flow Switch Inline Low Flow, Small Lines, All Liquids and Gases
FLT93C Flow Switch Insertion or Inline Sanitary Food, Bev, Pharm; All Liquids and Gases


  • Analyzer Flow Switch/Monitor

Model Type Application
FS10A Analyzer Flow Switch/Monitor Tube Tee / SP76  Analyzers and Sampling Systems, Gases and Liquids

  •  NuTec®2000 Series:Single Alarm for Liquids and Gases

Model Type Application
FS2000 Flow Switch Insertion Low Cost, Fast Response
FS2000L Flow Switch Inline Non-Intrusive; Sanitary


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