Autotest Home > Products > Emissions Measurement & Analysis > Raw Exhaust Mass Flow Measurement

Exhaust Mass Flow Meter

Raw Exhaust Mass Flow Meter

ExhaustTrak

Discover the benefits of direct in-situ exhaust flow meter measurement with ExhaustTrak. With our roots in flow measurement and automotive test, Sierra has developed ExhaustTrak, an innovative spin on a centuries-old flowmeter technology that solves one of today’s greatest flow measurement challenges.

Watch product video

Key Benefits of Sierra Exhaust Flow Meters:

  • Go directly to sample zone 
  • Eliminate contamination issues with innovative pressure-averaging rings
  • Eliminate need for chemical mass balance methods
  • Resolve temporal offset & instantaneous emissions’ error contributions vs. intake mass sources
  • Reduce flowmeter straight-length requirements
  • Meet or exceed US EPA 40 CFR Part 1065 
  • Allow for molar weight compensation through fuel H/C input, direct O2 measurement capability

Exhaust Mass Flow Meter Specifications:

Venturi Size - 1-inch to 8-inch OD Standard Absolute Pressure: up to 200 kPa Standard
Tempeature: up to 950°C Standard Maximum Flow Rates (500°C, 1 atm):
50 kg/hr - 6000 kg/hr Standard

exhaust trak comparison chart

exhaust trak venturi flow body

inside exhaust trak

Challenges of Direct Exhaust Measurement

  • Hight Temperature
  • Moisture
  • Pulsations
  • Turndown 
  • Pressure Drop
  • Particle-Laden Gases

The Indirect Solution

  • Current indirect methods of exhaust flow measurement are fraught with uncertainty.
  • Most common method estimates the flow using direct engine inlet air mass flow and chemical balance derived fuel mass to time-aligned gaseous emissions concentrations. 
  • This method is complicated
  • Most importantly, it has little room for improvement in measurement accuracy and repeatability

Why Measure Exhaust Direct?

  • Exhaust flow measurement, a critical input to emissions sampling
  • Only solution to improve accuracy and repeatability
  • Lower cost, real-time
  • Legal and accurate
  • Best for transient partial flow dilution proportional sampling
  • Eliminate flow-related bias
  • No sensitivity to upstream pneumatic capacitance
  • Best option for raw transient emissions measurement
Report Bug
Submit Bug Report

Name

Email

Reproducibility (Did you try to reproduce the bug?)

Classification

Summarize the problem but be specific enough that it can be recreated.

Note: Page, browser, and OS are automatically saved