a replacement for the obsolete Bacharach HI FLOW


For over 50 years, Sensors, Inc. has built a reputation for gas and particulate measurement products under the SEMTECH® brand in the automotive industry. Our fugitive methane analyzer is the latest entry in Sensors Emissions Measurement Technology (SEMTECH®) family. Sensors’ fugitive methane analyzer brings to bear our emission measurement experience into the oil and gas industry with a focus on leak detection and repair (LDAR).

Sensors, Inc. is proud to present the latest in direct quantification of leaks in the 0.01 to 20 CFM range with accuracy better than 5%. This device uses state-of-the-art flow and gas sensing technologies that are integrated into a handheld unit for accurate measurement during established LDAR programs.

The SEMTECH® HI-FLOW 2 is a robust, portable, battery powered, high volume sampler for the accurate quantification of fugitive methane emissions, comprising:

Fugitive Methane Test in Progress using HI-FLOW 2
  • Sampler - Handheld device with a high-volume vacuum sampling fan and total flowrate monitor
  • Analyzer - Portable control module (which can be carried, placed on the floor, or mounted to a backpack) housing the gas sensor technologies, control electronics, and battery pack

The combination of these two components (with a variety of sampling adapters) allows the entire fugitive methane emission to be captured, diluted, and quantified accurately.

By utilizing Tunable Laser Absorption Spectroscopy (TDLAS) for the accurate measurement of the fugitive methane, the dynamic range for concentrations can accurately span 4 to 5 orders of magnitude and moreover without any cross-interference from other gases present in the captured leak. Coupled with an accurate measurement of the extracted flow (methane leak and ambient air) the volume- and mass-based leak rate of the fugitive methane can be determined with high accuracy over a wide range (for example 0.001 to 25 CFM).

For more detailed information download our flyer.