Micro-venturi Flue Gas Velocity CEM


Flue gas flowmeter for continuous measurement of gas velocity, temperature and pressure in exhaust gas ducts (chimneys or flue pipes). Micro-Venturi technology.

The StackFlow 100 is a compact flowmeter for continuous measurement of velocity, temperature and static pressure in exhaust gas ducts ( stacks or flue gas ducts) using the Micro-Venturi technology. From these measurements, StackFlow 100 allows to determine the flue gas volume flow rate via an additional calculation element which is either performed by an ENVEA controller or directly by the CEMS cabinet’s data acquisition station. This data is used to calculate the mass flows of the pollutants released (dust, SO2, NOx…).

Flow range : 3 – 30 m/s

  • A single connection port integrated into the NFX flange of the gas sampling ENVEA LCPD box
  • Highly accurate and continuous measurement of gas velocity, temperature and pressure (DTP measurement)
  • Robust construction, resistant to harsh industrial environments
  • Clogging with no effect on the measurement, no need for backflushing
  • Compact solution with integrated pressure and temperature sensors
  • Measuring range: 3-30m/s with an accuracy of less than 10% above 5m/s
  • Combustion plants
  • Urban heating
  • Industrial chimneys (before or after treatment)
  • Process measurements in metallurgy, chemistry, mineral industry
  • Chemicals (eg Refinery / Rubber)
  • Power Generation Plants (eg Coal/Biomass)
Technical Specifications
Measured parameters Flue-gas velocity
Technology Micro-venturi
Measurement/Monitoring capability 3 – 30 m/s*
Stack/Duct diameter suitability 300mm up to 1,5m
Flue gas temperature  up to 400°C
Baghouse YES
Cartridge Filter YES
Ceramic Filter YES
Coalescent Filter YES
Cyclone YES
Electrostatic Precipitator (ESP) YES
Wet Electrostatic Precipitator (WESP) YES
Wet Scrubber YES
Sensor variants Stainless Steel
QA checks NO

*Application dependant

Technical data
Measurement capability 3 – 30 m/s
Resolution 0.2 m/s
Sensor Variants 316 Stainless Steel
Stack Temperature Ranges 400°C max
Functionality and QA Checks Manual reference checks
Data Output 3 outputs 4-20 mA not isolated
RS485 (Modbus) output to Controller
Mounting flange NFX 44-052
Enclosure Protection Rating IP65
  • Compliance with the MCP directive

Cases Studies