Gas (Mass) Flow Meters

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Gas Flow ( All Products)
Browse all of Sierra's gas mass flow meters, mass flow controllers and flow switches.

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Premium Digital Gas Mass Flow Meters & Controllers
Today's Most Advanced Mass Air Flow Sensors, Controllers and Flow Meters

Smart-Trak® 2 Model 100 Mass Flow Meters & Controllers
Digital high performance, stainless steel with Dial-A-Gas® Technology & computer control. Flow ranges from 0 to 15 sccm to 0 to 1000 slpm.

Micro-Trak™ Model 101 Ultra Low Flow Mass Flow Meters & Controllers
Specifically designed for flow ranges under 4 sccm (smlm) with a minimum controllable mass flow rate of 0.1 sccm (smlm). Also get digital high performance, stainless steel construction with Dial-A-Gas® Technology & computer control.

Max-Trak® Model 180 Industrial Mass Flow Meters & Controllers
Industry’s only NEMA 6/IP67 truly industrial MFC; Available as heavy industrial flanged version; Accuracy of +/- 1% of Full Scale and flow ranges from 0 to 10 SLPM to 0 to 1000 SLPM

Compod™ Programmable Control Module
Add Compod to any 100 Series model to get multi-drop RS-485/MODBUS RTU. With MODBUS, multiple instruments can be daisy-chained over a single network.

Economical/OEM Gas Mass Flow Meters and Controllers
Digital & Analog, All Gases, +/- 1.5% FS Accuracy, 316 SS or Aluminum

Digital: Smart-Trak 50 Series Mass Flow Meters & Controllers
Rapid off-the-shelf delivery lead-times; Constructed from your choice of 316SS or aluminum; Accuracy of +/- 1.5% of full scale and flow ranges from 0-10 sccm to 0-50 slpm, RS-232, RS-485, small footprint, CE approved.

Mass-Trak® Model 810C Mass Flow Controllers with display
Inexpensive nylon MFC with available large tiltable LCD readout for use with ALL inert gases. Accuracy of +/- 1.5% of full scale and flow ranges from 0-10 sccm to 0-50 slpm.

Top-Trak® Model 822/824 Mass Flow Meters
Inexpensive nylon MFM’s with available large tiltable LCD readout for use with ALL inert gases. Accuracy of +/- 1.5% of full scale and flow ranges from 0-10 sccm to 0-50 slpm.

Top-Trak® Model 826/827 High Flow Mass Flow Meters
Inexpensive aluminum MFM for higher flows of ALL inert gases with available large tiltable LCD readout. Accuracy of +/- 1.5% of full scale and flow ranges from 0-75 slpm to 0-175 slpm.

Analog Mass Flow Meters & Controllers
Traditional Analog Mass Air Flow Sensors, Controllers and Flow Meters

Side-Trak® Model 840 Traditional Analog Stainless Steel Mass Flow Controllers
An accurate and reliable stainless steel MFC with a wide flow range. Accuracy of +/- 1% of full scale and flow ranges from 0-10 sccm to 0-5600 slpm.

Side-Trak® Model 830 Traditional Analog Stainless Steel Mass Flow Meters
An accurate and reliable stainless steel MFM with a wide flow range. Accuracy of +/- 1% of full scale and flow ranges from 0-10 sccm to 0-5600 slpm.

Fast-Trak™ Model In-line Mass Flow Meter
A solution for applications requiring fast-response measurement and low-flow sensitivity. Product accuracy is ± 1% of full scale and the flow ranges from 0-200 scfm (air) with standard accuracy.

Top-Trak® Model 822S & Model 824S Econimical Analog Stainless Steel Mass Flow Meters
A value-priced, stainless steel MFM with available large tiltable LCD readout. Accuracy of +/- 1.5% of full scale (+/-1% of FS optional) and flow ranges from 0-10 sccm to 0-500 slpm.

Flo-Box™ Model 951 & 954 Digital Control/Readout and Power Supply Systems
The 950 Series includes a compact, single channel device and a deluxe, multi-channel device for operation of up to four mass flow instruments. The 950 Series is designed for use with the Sierra Model 830L, 830M, 840L and 840M instruments, but can be used on any brand of MFM or MFC.

Light-Industrial Thermal Mass Flow Meters
Thermal Air Flow Meters for Light-Industrial Products

Boiler-Trak™ Smart Insertion Gas Flow Meter
Boiler-Trak™ is designed to provide an economical and easy to install solution for natural gas or propane measurement to heaters and boilers and is optimized for greenhouse gas measurement. Product accuracy is ± 1% of full scale and the flow range is 80 to 1600 SCFM (natural gas) with standard accuracy.

Fast-Flo™ Model 620S NEMA 4X (IP65) Insertion Mass Flow Meter
A 200 msec fast time-response microprocessor-based transmitter in a NEMA 4X (IP65) enclosure. Product accuracy is ± 1% of full scale and the flow range is up to 20,000 sfpm (air) with standard accuracy.

Fast-Trak™ Model 730 In-line Mass Flow Meter
A solution for applications requiring fast-response measurement and low-flow sensitivity. Product accuracy is ± 1% of full scale and the flow ranges from 0-200 scfm (air) with standard accuracy.

Heavy Industry Thermal Mass Flow Meters
#1 Selling Thermal Mass Flow Meter in North America

Steel-Mass™ Model 640S Insertion Mass Flow Meter
Accurate and repeatable, this product is a rugged and reliable mass flow measurement workhorse in heavy industrial applications. Product accuracy is ± 1% of reading +0.5% full scale, and the flow range is up to 20,000 sfpm (air) with standard accuracy. It inserts easily into ducts and pipes to monitor total gas mass flow rate and is optimized for greenhouse gas measurement.

Multi-Trak™ Model 670S High-Performance Multi-Point Flow Meter for Large Ducts and Stacks
Sierra's Multi-Trak™ Model 670S is an advanced state-of-the-art instrument for measuring mass flow rates in very large ducts or stacks that have non-uniform velocity profiles, high turn-down requirements, dirty gas streams, wide temperature ranges and fast velocity and temperature changes.

Flat-Trak™ Model 780S In-line Mass Flow Meter with Flow Conditioning
Like its cousin the Model 640S, the Flat-Trak Model 780S provides repeatable, rugged, and reliable performance. Additionally, the product features Sierra’s flow conditioning elements. Product accuracy is ± 1% of reading +0.5% full scale, and the flow range is up to 20,000 sfpm (air) with standard accuracy. The Model 780S is also optimized for greenhouse gase measurement.

Ultra High Purity Model 780S UHP In-line Mass Flow Meter with Flow Conditioning
This model is the industry choice for gas distribution in ultra-clean processes. This product features 316L electropolished tubing with 7-10 Ra or 20-25 Ra interior finishes.

Flow-Trak™ Dual-Plate Flow Conditioning Element
As used in our Model 780S products, flow conditioning elements represent an economical solution to problems associated with monitoring flow installations where long, straight runs of piping are not available.

Heavy Industry Flow & Level Switch
Today's Most Advanced Flow and Level Instruments

Flow Switch for Gases & Liquids
Switches on a flow/no flow condition in both gases and liquids. Flow Switch range of 0.01 to 5 fps in liquids and 0.1 to 500 fps gases. Response Time of 0.5 to 10 seconds (media dependent) Wide operating temperature range of -100F to +390F (-70C to 200C) CE, CENELEC and CSA approvals.

Level Switch for Liquids
Indicates liquid level in tanks and process vessels. Switches on level change of 0.03 inch (dry to wet and wet to dry) Response Time: 0.1 to 1 second (media dependent). Wide operating temperature range of -100F to +390F (-70C to 200C). CE, CENELEC and CSA approvals.

High Temperature Flow Switch; Up to 850F
Designed for medium and high temperature applications. Medium Temperature to 300C (572F) ; High temperature to 485C (850F). Optional remote electronics for use in medium and Hi T environments. Switches on a flow/no flow condition in both gases and liquids. Flow Switch range of 0.01 to 5 fps in liquids and 0.1 to 500 fps gases. Response Time of 0.5 to 10 seconds (media dependent). CE, CENELEC and CSA approvals.

Sanitary Flow Switch
Designed for use in sanitary applications including food, beverage and pharmaceutical applications. 3-A Authorization No. 950 issued by the 3-A Sanitary Standards symbol Administrative Council. Switches on a flow/no flow condition in both gases and liquids. Flow Switch range of 0.01 to 5 fps in liquids and 0.1 to 500 fps gases. Response Time of 0.5 to 10 seconds (media dependent) Wide operating temperature range of -100F to +390F (-70C to 200C) 3A approval.

Live-Tap (Hot-Tap) Flow Switch
The Livetap (LT) allows for the safe insertion and removal of Innova-switches without interrupting the flow in your pipelines. With a pressure rating to 300 psig and a temperature rating of 390F, the Livetap can be used in the most demanding applications. An External extraction gauge lets you know when the switch is clear of the valve and dual safety restraints aid in the prevention of accidents.

Multivariable Mass Vortex
Gas, Liquid and Steam (Saturated & Superheated)

	Innova-Mass® Model 240 In-line Multivariable Mass Vortex Flow Meter Provides a direct reading of FIVE process parameters at the same time. Low maintenance, easy installation, and great configuration flexibility. Product mass flow measurement accuracy is ± 1% of rate for liquids and 1.5% of rate for gases and steam over a 30:1 range.
	Innova-Mass® Model 241 Immersible Multivariable Mass Vortex Flow Meter Provides a direct reading of FIVE process parameters at the same time in process pipe sizes up to 72 inches. Low maintenance, easy installation, and great configuration flexibility. Product mass flow measurement accuracy is ± 1.5% of rate for liquids and 2% of rate for gases and steam over a 30:1 range.

Volumetric Vortex Flow Meters
Gas, Liquid and Steam (Saturated & Superheated)

	Innova-Flo® Model 240V In-line Vortex Flow Meter Sierra's Model 240V Innova-Flo provides a direct reading of volumetric flow for liquids, steam or constant density gases. Product accuracy is ± 1% of rate for liquids and 0.7% of rate for gases and steam over a 30:1 range.
	Innova-Flo® Model 241V Immersible Vortex Flow Meter Model 241V Innova-Flo provides a direct reading of volumetric flow for liquids, steam or constant density gases. The unique insertion design may be used in process piping from 2-inches up to 72-inches. Product accuracy is ± 1.2% of rate for liquids and 1.5% of rate for gases and steam over a 30:1 range.