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Four-Sensor Design Innovation 640i/780i

Advancements to traditional thermal sensor technology for greatly improved accuracy

qTherm Technology

Learn about the revolutionary “brain” inside the instrument as well as Dial-A-Gas, Dial-A-Pipe and the qTherm Gas Library

User Interface

Push-button display & user software manages changes to the meter as well as diagnostics and tuning

Electronics & Inputs/Outputs

Information about options, configuration, output signals and digital communications

Four-Sensor Design Innovation 640i/780i

Beyond Traditional Thermal

Innovative new QuadraTherm™ Four-Sensor thermal technology provides critical sensor inputs to a propriatary qTherm heat transfer algorithm set to instantly calculate gas mass flow rate at very high accuracies.  The innovative new sensor mechanical design coupled with qTherm provides accuracy-never before possible with thermal technology.  Watch video of the inventor.

  • Accuracy: +/- 0.5% of Reading*

  • Three Temperature Sensors

  • No-Drift Velocity Sensor

  • Isolates Forced Convection (Mass Flow)

  • Neutralizes Unwanted Heat Transfer (False Flow)

  • Multivariable: T, P and Mass Flow Velocity

  • Eliminates Probe Downdraft (False Flow)

  • Lifetime Sensor Warranty

*Verified by an independent NIST & NVLAP accredited metrology lab. See 780i inline for 0.5% of reading accuracy; See 640i insertion for 0.75% of reading accuracy.

QuadraTherm Sensor

QuadraTherm Sensor

The patented four-sensor design is required to fully isolate forced convection (gas mass flow rate) and calculate out the nearly 25% of unwanted heat transfer components. By doing this, we solve the First Law of Thermodynamics for the greatest accuracy potential.

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DrySense Technology

DrySense Technology

Patented "dry" velocity sensor with zero "wet" cements or epoxy potting compounds that crack and shift over time, all backed by a lifetime warranty.

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AeroMax

AeroMax

The aerodynamic contouring design of the sensor head eliminates probe flow downdraft effects that cause false flow readings.
Multivariable

Multivariable

An optional pressure sensor port makes the meter fully multivariable. Temperature and mass flow velocity are standard with every meter.

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