mass flow meter / thermal / for gas / for air
MultiTrak™ 670S



  • Technology:

    mass, thermal

  • Fluid:

    for gas, for air

  • Other characteristics:

    with display, 4-20 mA, multi-point, stainless steel, clamp-on

  • Process temperature:

    Max.: 400 °C (752 °F)

    Min.: -40 °C (-40 °F)


Sierra's MultiTrak™ 670S is an advanced state-of-the-art thermal mass flow meter system for measuring mass flow rates in very large ducts or stacks that have:

Non-uniform velocity profiles
High turn-down requirements
Dirty gas streams
Wide temperature ranges
Fast velocity and temperature changes
Product Benefits

Excellent choice for acurately measuring mass flow rate in large pipes or ducts
State-of-the-art ISO 9001 calibration facility to assure best system accuracy
670S system consists of:
Up to four sensing points linked via Modbus
One control box with touch-screen HMI
4 to 20 mA output module with the associated cables (power, 4 to 20 mA output cable for daisy-chaining all sensing points)
Features our patented no-drift DrySense velocity sensor: Watch video...
Lifetime warranty on sensor
Greenhouse Gas (GHG) certified to meet EPA (40 CFR Part 98)
User-friendly microprocessor-based Human Machine Interface (HMI) controls all functions of system
Touch screen HMI used to collect, visualize and store flow data, as well as set up the individual sensor points
Entire system to be easily configured in the field
HMI integrates the following functions:
Mass flow rate and totalized flow
Flow-range adjustment
Field validation and diagnostics
Configuration and setup
HMI offers advances over industry-standard collector boxes allows users to:
Average the flow of 4 meters
Convert flow units
Set up the density of the gas for mass flow measurement
Configure the individual sensor points
Set up alarms