ThomasNet News Logo
Sign Up | Log In | ThomasNet Home | Promote Your Business

Thermal Mass Flowmeter delivers accuracy for thermal dispersion.

Print | 
Email |  Comment   Share  
Thermal Mass Flowmeter delivers accuracy for thermal dispersion.
Thermal Mass Flowmeter delivers accuracy for thermal dispersion.
Click Here to Enlarge Picture
November 13, 2012 - Featuring multivariable output for mass flow, temperature, and pressure (optional), QuadraTherm™ 640i (insertion) and 780i (inline) employ 3 precision platinum temperature sensors and one no-drift DrySense™ mass velocity sensor as well as iTherm™ algorithm set. Inline version achieves gas mass flow rate measurement accuracy of ±0.5% of reading above 50% FS (air). Repeatability for mass flow rate is ±0.15%, and gas accuracy is ±1.8°F.

Sierra Announces Never Before Possible Accuracy for Thermal Dispersion Technology

(Archive News Story - Products mentioned in this Archive News Story may or may not be available from the manufacturer.)

Sierra Instruments
5 Harris Ct.
Monterey, CA, 93940

Press release date: November 8, 2012

Sierra Instruments today introduces their new QuadraTherm™ 640i / 780i Thermal Mass Flow Meter Series, marking a disruptive breakthrough in thermal dispersion technology. With its sensor design advancements, coupled with a proprietary iTherm “Brain”, the 780i inline version achieves gas mass flow rate measurement accuracy of +/- 0.5% of reading above 50% of the full scale (Air) making it the most accurate thermal meter in the industry. Before today, this level of accuracy was never thought possible with thermal dispersion mass flow meters.

At the heart of the 640i / 780i is its revolutionary patented QuadraTherm sensor and proprietary iTherm™ algorithm set. Traditional thermal sensors have two sensors–one temperature sensor and one velocity sensor, each in a separate probe. QuadraTherm introduces four sensors—three precision platinum temperature sensors and one patented no-drift DrySense™ mass velocity sensor, which is backed by a lifetime warranty and uses a proprietary manufacturing process to greatly improve accuracy and long-term stability.

Performance improvements never before possible are gained as the QuadraTherm sensor isolates forced convection (the critical variable for measuring gas mass flow rate) by calculating and then eliminating unwanted heat-transfer components, like sensor stem conduction, one of the major causes of false flow readings. This provides customers a true flow rate reading for their application and unprecedented accuracy in the market.

QuadraTherm and iTherm solve the First Law of Thermodynamics (for thermal dispersion technology) in a fraction of a second for each mass flow data point. They calculate stem conduction and all other unwanted heat loss components, subtract them out, and then compute the mass flow rate from the remaining forced convection component.

The result is a proprietary, fundamentally different gas mass flow rate calculation using all pertinent variables for the most precise, stable and accurate thermal mass flow measurement possible.

“We are extremely proud of this product which will dramatically change the thermal mass flow market. Using current thermal dispersion technology, mass flow meters have never been able to achieve accuracies of +/- 0.5% of reading. By harnessing over 40 years of hardnosed dedication to excellence in innovation and expertise in thermal dispersion measurement, the advancement of the 640i / 780i mark a disruptive change in thermal mass flow measurement technology.” says Matthew Olin, President of Sierra.

And, with Dial-A-Pipe™, customers can relocate the probe to different pipe sizes and types in the field. With Dial-A-Gas®, iTherm provides gas change capability.

Sierra has developed an iTherm Gas Library which stores proprietary Gas Packets. A Gas Packet is analogous to the DNA of a specific gas. It stores all the parameters needed to instantly calculate the thermodynamic and transport properties of every gas or gas mixture versus temperature and pressure.

Currently, the library has mapped 18 gases and mixtures. And it continues to grow and improve by the day. Furthermore, the millions of data points collected over time in Sierra’s metrology laboratories are used to tune the instrument for better performance and accuracy. Customers can expect hundreds of data sets and gas and gas mixture combinations in the future that can be downloaded to their QuadraTherm meter via the internet to upgrade and improve their meter over its lifetime.

For customers who enjoy the many benefits of thermal technology—wide turndown ratios, nominal pressure drop, no moving parts, installation flexibility, and a direct gas mass flow rate measurement—now you get percent of reading accuracy is part of the QuadraTherm total package.

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).

Go to to learn more.
Print | 
Email |  Comment   Share  
Contacts: View detailed contact information.


Post a comment about this story

(your e-mail address will not be posted)
Comment title:
To submit comment, enter the security code shown below and press 'Post Comment'.

 See related product stories
More .....
 See more product news in:
Test and Measuring Instruments
 More New Product News from this company:
Transient Partial Flow Dilution System complies with Part 1065.
Thermal Dispersion Mass Flow Meter features ±0.5% accuracy.
Mass Flow Meter includes direct-acting control valve.
Cryogenic Mass Vortex Flow Meters measure fluids down to -328°F.
More ....
| Featured Manufacturing Jobs
 Other News from this company:
New Animated Video Shows Principle of Operation of Thermal Mass Flow Meters
Sierra Expands Primary Standard Gas Flow Calibration Systems & Online Store
QuadraTherm® 640i/780i Now With Full Suite of Global Agency Approvals-cFMus, ATEX and IECEx
Sierra Announces New Meter for Continuous Fuel Consumption Measurement
Sierra Instruments Announces QuadraTherm® Thermal Mass Flow Meters Now Have Full Device Description Foundation Fieldbus
More ....
 Tools for you
Watch Company 
View Company Profile
Company web site
More news from this company
E-mail this story to a friend
Save Story
Search for suppliers of
Mass Flowmeters
Thermal Flowmeters
Join the forum discussion at:
Tools of the Trade

Home  |  My ThomasNet News®  |  Industry Market Trends®  |  Submit Release  |  Advertise  |  Contact News  |  About Us
Brought to you by        Browse ThomasNet Directory

Copyright © 2014 Thomas Publishing Company. All Rights Reserved.
Terms of Use - Privacy Policy

Error close

Please enter a valid email address