Thermatel® Thermal Mass Flow Meter Product Line


THERMATEL Model TA2 Thermal Mass Flow Transmitter provides reliable mass measurement for air and gas flow applications. The powerful, yet easy to use, electronics are contained in a compact explosion proof enclosure. The TA2 is available with both insertion probes as well as flow body design for smaller pipe sizes. The TA2 offers excellent performance at an exceptional value.


  • Direct mass flow measurement of air and gas
  • Strong signal at low flow rates with high turndown
  • Process temperatures to +400°F (+200°C)
  • Rotatable housing and display for viewing from all angles


  • Built-in totalizers and optional second mA and pulse outputs
  • Field calibration verification


THERMATEL Model TD1/TD2 flow/level/interface switches provide a new level of performance and reliability not found in previous switches. Continuous diagnostics with fault indication, temperature compensation, narrow hysteresis and fast response time make the TD1/TD2 the latest in thermal dispersion switch technology.


  • Temperature compensated to provide repeatable alarm under varying process temperatures
  • Continuous diagnostics detect sensor fault
  • Non-linear mA output signal can be used for trending, diagnostics and repeatable flow/level indication


  • Detects minimum flow or
    presence /
    absence of flow
  • Easy / fast calibration
  • Excellent low flow sensitivity


THERMATEL TG1 provides a two-wire, intrinsically safe circuit between the probe and remote din rail enclosure. The switch is suitable for liquid or gas flow, level, or interface detection using the proven thermal dispersion technology.


  • LEDs provide visual flow indication
  • 24 VDC input power
  • mA output signal for diagnostics and repeatable flow/level indication
  • Adjustable set point and time delay
  • SPDT Alarm relay

THERMATEL Model TD2 Hygienic

Designed for use specifically in the clean or hygienic process industry, the THERMATEL TD2 is an outstanding flow/level switch where easy external wipedown and a sensor free of cracks and crevices are required. 

The TD2 Thermal Dispersion Flow/Level switch provides continuous diagnostics, temperature compensation, narrow hysteresis, and fast response time for superior performance.

The TD2 switch uses either AC or DC input power, provides a DPDT relay output with a visual LED indication of status through the glass window in the cover. Other features include ability to electronically measure the set point, a mA output signal for trending and diagnostics and time delay.