Model FS10A Analyzer Flow Switch/Monitor


The Model FS10A Analyzer Flow Switch/Monitor features a SP76 adapter that supports and/or integrates easily with NeSSI standard compliant hardware. The SP76 adapter for NeSSI modular manifolds allows the FS10A to be installed into a standardized mechanical platform for analyzers and sensors.


In NeSSI compliant devices, sample system components such as the FS10A can be mounted onto a standard fluidic interface for modular surface-mount components. The FS10A conforms to NeSSI Generation I and is prepped for Generation II and III compliance.


The FS10A Analyzer Flow Switch/Monitor is a small, lightweight instrument featuring low flow sensitivity, a choice of electronic outputs, and a no-moving parts design that ensures maximum reliability. It is ideally suited for continuous monitoring of analyzer sample flows to provide the highest integrity process analysis without interruption.


The FS10A ensures continuous reliability and requires virtually no maintenance. Unlike capillary bypass flow meters and controllers, the FS10A has no cavities, orifices or dead- legs that trap fluids and lead to contaminated samples, which preserves sample integrity and provides faster system sampling times. The instrument’s wetted parts are corrosion-resistant 316L stainless steel with Hastelloy-C sensor tips.


The FS10A can be used with nearly all types of process and emissions sampling systems, including: gas chromatographs (GCs), mass spectrometers, optical spectrometers, photometers and others. The FS10A Analyzer Flow Switch fits in a standard 0.25 in. tube tee.


Operating over a wide flow range in multiple configurations, the FS10A features a flow range in air from 0.1 to 40 SCFH (50 to 20,000 cc/min) and a flow range in water from 0.001 to 0.03 GPM (4 to 100 cc/min). It accommodates wide turndowns with a ratio up to 100:1. A single model can be used for most gas and liquid applications with a simple in-field set up.


The FS10A is designed with a fully-sealed aluminum housing to protect electronics in harsh plant environments. The electronics can be integral mounted with the sensor element in a uni-body configuration or remotely mounted for easy front panel display viewing.


It features a top-mounted, 10 LED array and two pressure-sensitive button touch controls. The LED display provides users visibility of flow rate trend, alarm status, and power on/off. The flow switch’s set-up and setpoint values can be changed via the two push-buttons or via its standard RS232C serial interface.


The FS10A is available with a choice of electronic outputs. The switch output can be either an open collector (transistor) or a 1A relay settable for NO or NC operation. The switch settings are user programmable for trip control of hysteresis and time delay. An optional 4-20 mA output is available for trending, which is field settable to represent the flow rate span.


The SIL rated FS10A features multiple agency approvals and is ideal for gas or liquid analyzer sampling systems in oil/gas refining, chemical processing, stack monitoring, advanced materials, and pharmaceuticals semiconductor fabrication.


  • For gases and liquids
  • Superior low flow sensing
  • SP76 Mounting (NeSSI) systems or tube tee
  • Requires only one SP76 block
  • Push button or RS232 set-up
  • Single configuration meets all flow ranges, 100:1 turndown
  • Choice of outputs: Open collector (N-Channel) or relay, and 4-20 mA
  • LED array shows flow rate and switch trip
  • Integral or remoteSimple, screw-in installation
  • No moving parts
  • No cavities or dead-legs
  • SIL 2 Rated



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