The Sierra Instruments Flat-Trak™ Model 780S Inline Mass Flow Meter with Flow Conditioning is an inline thermal mass flow meter used for industrial gas mass flow measurement where piping layouts may not allow long straight-run installations.
Its built-in flow conditioning helps address distorted velocity profiles, swirl, and temperature stratification in the gas stream.
This meter supports gas flow monitoring for applications such as boilers and burners, air volume flow metering, compressed air flow, combustion air flow, natural gas fuel flow, custody transfer, and stack gas emissions flow monitoring.

Key Characteristics
- Inline thermal mass flow meter with built-in flow conditioning
- Designed to reduce upstream straight-run requirements
- Thermal dispersion technology for direct mass flow measurement
- No moving parts
- Low pressure drop
- Flow totalizer and alarms
- Digital communications: Modbus RTU
Ideal Applications
- Gas flow measurement where long straight pipe runs are limited
- Gas to boilers and burners
- Air volume flow metering
- Compressed air flow
- Combustion air flow
- Natural gas fuel flow
- Stack gas emissions flow monitoring
Product Family Includes
- FlatTrak™ 780S
- Inline Thermal Mass Flow Meters with Flow Conditioning
- Related insertion version: Model 640S for pipes/ducts up to 72″
Industries Served
- Process Control & Manufacturing
- Environmental
- Oil & Gas
- Digester & Landfill Gas
- Petrochemical
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