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Research and Development for the GSA

A comprehensive guide of products, services and suppliers related to research and development of the GSA.

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QuadraTherm 640i/780i<br />

NEVER<br />

H I G H A C C U R A C Y : F O U R - S E N S O R : M A S S F L O W M E T E R<br />

be<strong>for</strong>e possible.<br />

®<br />

The World’s Most<br />

Accurate Thermal<br />

Mass Flow Meter.<br />

From Sierra’s beginning over <strong>for</strong>ty<br />

years ago, Founder Dr. John G. Olin<br />

was driven by his vision to design <strong>the</strong><br />

world’s most accurate <strong>the</strong>rmal mass<br />

flow meter. Two revolutionary technologies—QuadraTherm<br />

® <strong>and</strong><br />

qTherm, have made his vision<br />

a reality.<br />

QuadraTherm Sensor<br />

This revolutionary new four-sensor<br />

design isolates <strong>for</strong>ced convection<br />

(<strong>the</strong> critical variable <strong>for</strong> measuring<br />

gas mass flow rate) by neutralizing<br />

unwanted heat-transfer components,<br />

like sensor stem conduction, one of<br />

<strong>the</strong> major causes of false flow<br />

reading inaccuracies.<br />

qTherm Brain<br />

qTherm is a proprietary algorithm set<br />

that uses QuadraTherm sensor inputs<br />

to solve <strong>the</strong> First Law of Thermodynamics<br />

(Heat Energy In = Heat Energy<br />

Out) <strong>for</strong> <strong>the</strong>rmal dispersion technology.<br />

Accuracy never be<strong>for</strong>e possible<br />

is <strong>the</strong> remarkable result!<br />

Accuracy: +/- 0.5% of Reading<br />

Multivariable: Mass flow rate,<br />

temperature & pressure<br />

Revolutionary QuadraTherm ®<br />

four-sensor design<br />

DrySense no-drift sensor with<br />

lifetime warranty<br />

qTherm living, learning “Brain”<br />

manages all inputs<br />

Dial-A-Pipe: Change pipe size<br />

Dial-A-Gas: Change gas type<br />

qTherm Gas Library: 18 gases &<br />

mixtures (growing & improving)<br />

Global Agency Approvals: ATEX,<br />

IECEx, CE, cFMus<br />

Digital Communications Solutions:<br />

HART, Profibus DP, MODBUS, RTU,<br />

Foundation Fieldbus<br />

sierrainstruments.com<br />

North America / 800.866.0200<br />

Europe / +31 72 5071400<br />

Asia-Pacific / +8621 5879 8521/22

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