View Selection Chart

Subscribe to our mailing list to get news about new products, application stories, & more!

QuadraTherm® Thermal Mass Flow Meters Obtain HART and Profibus DP Certification

Opening Up Wastewater and Heavy-Industrial Gas Measurement Markets

Monterey, CA- July 10, 2014 – Sierra Instruments, a leading global mass flow meter manufacturer, announces its QuadraTherm® 640i and 780i air/gas flow meters are now available with HART and Profibus DP certifications. The new certifications are indications of full compliance with both the HART Communication Protocol and Profibus DP Protocol. These new Hart and Profibus DP digital communication protocols give customers flexible application solutions in wastewater and heavy-industrial applications.

“Adding the HART and Profibus DP protocols make our QuadraTherm an ideal fit for the wastewater treatment and heavy industrial plant management industries. Now customers who demand the highest accuracy flow measurement and also need these protocols will have a perfect application solution. Our goal has always been to offer our customers the most comprehensive solutions for their flow applications,” says Scott Rouse Product Line Director.

HART and Profibus are industry-proven global standards of digital communication protocols. Both HART and Profibus are easy-to-use communication protocols that allow for faster and more flexible production and plant management. Both Profibus and HART bring efficiency to the plant facility with their easy migration, giving transparency to plant operation information down to air flow meter activity.

Sierra’s QuadraTherm 640i/780i equipped with HART and Profibus digital communication protocals is yet another way that the QuadraTherm is bringing increased flexibility and precise flow measurement to its users. With either HART or Profibus, or both, end users will have easy access to all relevant data available in their flow meter, allowing them to see where they need to make improvements in their process. 

QuadraTherm provides the best accuracy +/- 0.5% of reading above 50% of full scale for flow meter air measurement and other gases; built-in flow conditioning (inline version); multivariable outputs; flow ranges up to 60,000 sfpm (305 smps); qTherm® Dial-A-Gas®, Dial-A-Pipe™, and Hazardous Area approvals. The QuadraTherm is available in two models: the 640i insertion and 780i inline. The QuadraTherm family has a no-drift sensor with lifetime warranty; has multivariable output: mass flow, temperature, pressure (optional); measures all inert and all non-condensing clean gases; flammable gases (methane, propane, hydrogen, and digester gas); repeatability for mass flow rate is +/- 0.15% ; ValidCal™ Diagnostics  to validate calibration in the field; and gas accuracy is +/- 1°C (1.8°F).

Sierra’s digital communications solutions across our product line include HART, Profibus DP, Modbus RTU, Foundation Fieldbus, and BACnet (DeviceNet pending). Sierra’s goal is to make it as easy as possible for end users to find the information they need to integrate our flow instruments into their digital communications network.

View our full digital communications solutions offering today. Sierra offers comprehensive engineering services to support all available communications protocols for seamless integration.



A global leader in flow measurement and control for over 40 years, Sierra instruments designs and manufactures high performance flow instrumentation for gas, liquid and steam applications commonly found in the pharmaceutical, scientific research, health, energy and semi-conductor industries. With over 150 offices in 50 countries, Sierra is uniquely positioned to provide their innovative products and lifetime support for the leading companies of today and the growth enterprises of tomorrow.


  • Related Product

    QuadraTherm 640i

    QuadraTherm 640i

    Request Quote
    Product Info
    Family Info

  • Media Resources