Consistent Thermal Flow Meter Measurement for Increased Accuracy and Profitability

With more than 40 years of experience developing and selling inline and insertion thermal flow meter technology, Sierra has established a large and successful installed base. Our immersible thermal gas mass flow meters were also deemed North America's #1 selling immersible thermal mass flow meter (2009 Flow Research, Yoder). We offer both inline and insertion thermal mass flow meters for heavy and light industrial applications. Our thermal flow meters range from our highest-performance QuadraTherm four-sensor technology to our more traditional, but also very accurate, two-sensor technology instruments.

Sierra’s immersible thermal gas mass flow meter technology offers customers rugged and reliable industrial gas and air mass flow measurement for small pipes, as well as 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. With our new 640i QuadraTherm thermal flow meter, now you get extreme precision with percent of reading accuracy as part of the total QuadraTherm package.

All of our thermal gas flow meters feature the long-term stability of our patented no-drift DrySense swaged velocity sensor technology and are backed by a lifetime warranty. As the name implies, Sierra’s swaged velocity sensor is the only thermal sensor in the world that is truly “dry” using no organic or cement fillers that crack and shift causing drift over time. For specified heavy industrial products, we offer the following digital communications solutions: HART, Modbus RTU, and Profibus DP. View all of our digital communications solutions, offering turnkey results for industrial systems automation and control.

QuadraTherm^® 640i Air Mass Flow Meter
Worlds most accurate insertion thermal meter. Accuracy: +/- 0.75% of reading; 3/4-inch (19.1 mm) insertion probe up to 72-inch (2m) long, multivariable outputs, flow ranges up to 60,000 sfpm (305 smps). Agency approvals: CE, cFMus, ATEX, IECEx.

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SteelMass 640S
Traditional thermal insertion meter; Accuracy: ± 1.0% of reading +0.5% of full scale; Mass flow measurement workhorse in heavy industrial applications; Flow range is up to 20,000 sfpm (102 smps).

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BoilerTrak 620S BT
Optimized for boiler and heater effeciency applications; Product accuracy is ± 1% of full scale and the flow range is 80 to 1600 scfm (natural gas) with standard accuracy.

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FastFlo 620S Mass Flowmeter
Very fast 200 msec time-response; Product accuracy is ± 1% of full scale with flow range is up to 20,000 sfpm (102 smps) on air.

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QuadraTherm® 780i Inline Mass Flow Meter
Worlds most accurate inline thermal meter; Accuracy: +/- 0.5% of reading; inline version with built-in flow conditioning; multivariable outputs, flow ranges up to 60,000 sfpm (305 smps). Agency approvals: CE, cFMus, ATEX, IECEx.

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FlatTrak 780S
Traditional thermal inline meter; Accuracy: ± 1.0% of reading +0.5% full scale; Built-in flow conditioning; Flow range is up to 20,000 sfpm (102 smps).

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FlatTrak 780S-UHP
Bulk gas delivery in ultra-clean processes; 316L electropolished tubing 7-10 Ra or 20-25 Ra interior finishes.

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MultiTrak 670S
Measure mass flow rates in very large ducts or stacks; non-uniform velocity profiles, high turn-down requirements, dirty gas streams, wide temperature ranges and fast velocity and temperature changes.

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ChlorineTrak 760S Mass Flow Meter
Cost-effective mass-flow measurement solution for chlorine injection processes; Flow range is up to 300 scfm chlorine in a 4” Kynar^® flow body; No need for expensive hastalloy materials.

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