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Allison is offering FCI thermal dispersion flow and level instruments that it claims are the only thermal dispersion devices with both the Nuclear IEEE Cat.1E accreditation and SIL2 compliance.

In the UK, Allison Engineering has supplied FCI level solutions for both Radwaste interface (radioactive waste slurry interface) and sump level applications.

Worldwide, FCI level and flow instruments are installed in more than 115 nuclear power plants and these are operating on more than 30 different applications including, analyser sampling systems, flood alarm, turbine water level, chemical injection, pump protection, condenser off gas flow and reactor core coolant.

With its experience and ongoing commitment to the nuclear qualifications of its instruments, Allison offers flow and level solutions for a variety of new-build and decommissioning applications.

The FCI thermal dispersion technology features a probe that has two thermowell-protected platinum RTD temperature sensors in the process stream.

One RTD is heated while the other senses the actual process temperature.

The temperature difference between these sensors is measured, which is directly proportional to mass flow.

From this reading, a variety of outputs can be provided, including simple level/flow switching, multi-point level and gas mass flow.

The FCI thermal dispersion range is designed to offer fast response, high accuracy and repeatability.

With no moving parts, it is virtually maintenance free, and is able to measure both flow/level and temperature.

Allison Engineering

Allison Engineering Ltd has been established for 30 years and specializes in the supply of high quality process instrumentation and safety related equipment. Markets served include Oil, Gas and Petrochem, Water & Waste, Environmental, Power, Pharmaceutical and Automotive.


We supply an extensive range of flow and level products, such as Thermal Gas Mass Flow Transmitters, Thermal Flow & Level Switches, Flow conditioners, Magnetostrictive Level, Guided Wave Radar, Laser level transmitters and Magnetic Level Gauges.


More recently our range has extended with the addition of specialised safety products, such as safety shields that prevent pipeline spray-outs, acid detection paint and Tuneable Laser Gas Detection products. We are proud of our reputation of being able to solve ‘difficult’ process problems by offering non-competing, alternative, state-of-the-art technologies. This means we can guarantee product knowledge, application knowledge as well as competition knowledge.

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