640i Mass Flow Meter (Insertion Version)

Accuracy Never Before Possible.

The QuadraTherm innovation introduces four sensors—three precision platinum temperature sensors and one patented DrySense mass velocity sensor.  For the first time, the result is gas mass flow rate measurement performance rivaling Coriolis, but with 100:1 turndown, low pressure drop, and a much lower price point.  Explore the menu to your right to learn more…

  • Accuracy of +/- 0.75% of Reading*

  • Flow range up to 60,000 sfpm (305 smps)

  • Insertion probe up to 72″ (2m) long

  • QuadraTherm™  Four-Input Sensor

  • DrySense™ No-Drift Velocity Sensor

  • qTherm® Gas Database

  • Change Gases: Dial-A-Gas™

  • Change Pipe: Dial-A-Pipe™

  • Multivariable: T, P, Mass Flow 

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

Explore Versions

Interactive descriptions, images, and video of unique features and core technologies

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