Sierra design and manufacture high-performance thermal mass flow controllers, immersible thermal mass flowmeters, vortex flow meters, and transit-time ultrasonic flow meters for nearly every gas, liquid, or steam application.

Sierra's flow meter devices are available in both standard and customized versions for applications in laboratory, industrial, and hazardous environments. Sierra's flow meter instruments precisely measure or control very low flows down to less than 1 sccm full scale, as well as extremely high flows of gas, liquid, and steam. With rugged product design, cutting-edge innovation, and a team of flow experts, Sierra Instruments comprises over 150 locations worldwide.

Providing cost-effective, robust, turnkey flow metering solutions for:

• Gas
• Air Monitoring
• Emissions
• Oxygen
• Water
• Diesel
• Displacement
• Particulate
• Analyzer Measurement
• And many more…

Sierra holds over 20 patents on its various sensor technologies and innovations. 

• Thermal Mass Flow Meters & Mass Flow Controllers - We are a manufacturer of premium quality and performance mass flowmeters and controllers for use in semiconductor, pharmaceutical, and research industries. Machine builders and systems integrators are large users and specifiers of our MFCs.

• Vortex Shedding Flow Meters, Thermal Mass Flowmeters Inline and Insertion Probe Type, and Transit-Time Ultrasonic Flow Meters are our core industrial flow measurement technologies. We provide natural gas, mass air flow, water flow, and oxygen flow meters for industrial applications. Sierra also carries pipe, ultrasonic, digital, and other meters to measure liquids and steam.

Flow Meters for Liquid Measurement

InnovaMass 240i Inline

Sierra Instruments

Maximise your productivity and savings with the iSeries InnovaMass 240i Inline Vortex Flow Meter for Liquid Measurement.

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InnovaMass 241i Insertion

Sierra Instruments

Maximise your productivity and savings with the iSeries InnovaMass 241i Inline Vortex Flow Meter for Liquid Measurement.

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InnovaMass 240S Inline

Sierra Instruments

The InnovaMass 240S is a reliable flow meter with no moving parts and is flexible with multivariable options available.

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InnovaMass 241S Insertion

Sierra Instruments

The InnovaMass 241S is a reliable, rugged, long lasting vortex flow meter for industrial applications with no moving parts.

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InnovaSwitch - Flow

Sierra Instruments

The InnovaSwitch 615 insertion-type flow switch is a high-performance, industrial-grade mass flow switch for liquids and gases.

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InnovaMass Switch - Level

Sierra Instruments

The InnovaSwitch 615 insertion-type level switch is a high-performance, industrial-grade liquid level indicator for tanks and process vessels.

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Flow Meters for Gas Measurement

FastFlo 620S

Sierra Instruments

The 620S is an insertion thermal mass air flow sensor that has been designed to give you a highly reliable, responsive and affordable mass flow measurement .

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BoilerTrak 620S-BT

Sierra Instruments

The 620S-BT has been designed to provide an economical, easy-to-install solution for precise natural gas measurement for heaters and boilers.


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SmartTrak 100

Sierra Instruments

The SmartTrak 100 is a range of digital mass flow meters and controllers. Suited for Industry and Research with thermal technology and a small footprint.

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SmartTrak 50

Sierra Instruments

The SmartTrak 50 is a low cost range of digital mass flow meters and controllers. Featuring a large display, small footprint. Suited for Industry and Research.

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SmartTrak 140

Sierra Instruments

The SmartTrak 140 is an Ultra Low Pressure Drop Mass Flow Controller, user friendly it has been designed for stable, accurate and repeatable gas mass flow control.

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ChlorineTrak 760S

Sierra Instruments

The 760S has been designed for accuracy and a cost-effective mass flow measurement solution for chlorine injection processes found in typical waste-water treatment.

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MaxTrak 180

Sierra Instruments

The MaxTrak 180 is an Industrial Digital Mass Flow Controller that is suited for dirty industrial processes and available with 316 stainless steel flanges.

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SmartTrak 100 HP

Sierra Instruments

The SmartTrak 100 HP is a range of Ultra High Pressure Gas Mass Flow Meters and Controllers that are field adjustable, measure and control up to 5000 psig.

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MassTrak 810

Sierra Instruments

The 810 is an economical Digital Mass Flow Controller with a large LCD screen that has been designed to control the flow of air and all inert gases and mixtures.

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TopTrak 820

Sierra Instruments

The TopTrak 820 is part of the economical 800 range of Mass Flow Meters with proven direct gas flow measurement. Ideal for general Industry applications.

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QuadraTherm 780i

Sierra Instruments

The 780i is the most accurate inline thermal mass flow meter for air/gas flow rate measurement on the market today. Part of Sierra's Big 3 iSeries.


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qMix Software

Sierra Instruments

The qMix™ software from Sierra Instruments is a powerful, user-customisable gas mix feature included with every QuadraTherm® thermal mass flow.

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Flow Meters for Steam Measurement

InnovaMass 240i

Sierra Instruments

Maximise your productivity and savings with the iSeries InnovaMass 240i Inline Vortex Flow Meter for Liquid Measurement.

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InnovaMass 241i

Sierra Instruments

Maximise your productivity and savings with the iSeries InnovaMass 241i Inline Vortex Flow Meter for Liquid Measurement.

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InnovaMass 240S

Sierra Instruments

The InnovaMass 240S is a reliable flow meter with no moving parts and is flexible with multivariable options available.

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InnovaMass 241S

Sierra Instruments

The InnovaMass 241S is a reliable, rugged, long lasting vortex flow meter for industrial applications with no moving parts.

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