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New QuadraTherm 640i / 780i: Accuracy Never Before Possible!


Nov 08, 2012

View of QuadraTherm Sensor Looking Up the Probe Shaft


Innovative QuadraTherm Four-Sensor Design

Traditional thermal sensors have two sensors—one temperature sensor and one velocity sensor, each in a separate probe sheath. QuadraTherm (the term “Quad” meaning “four”) introduces four sensors—three precision platinum temperature sensors and one patented DrySense mass velocity sensor. Performance improvements never before possible are gained as the QuadraTherm Technology 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.

iTherm, the Brains Behind it

iTherm is the true “Brain” of the instrument and a revolutionary, living, learning algorithm set made possible by today’s hyper-fast microprocessors and QuadraTherm sensor inputs. iTherm manages changes in gas flow, gas temperature and gas pressure, as well as outside temperature, via a comprehensive heat-transfer model. The result of iTherm 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.

I am proud to say the never before possible, is Now Possible with  QuadraTherm 0.5% of reading accuracy.  Learn more…

Matthew Olin, President & CEO
Written By:
Matthew Olin, President & CEO
Sierra Instruments

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