SWT03335 Flow Sensor

Code: SWT03335
Trane Thermal Flow Sensor, Switch SWT03335

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Trane SWT03335 Switch; Flow Sensor Thermal (X13790871040)

Thermal Flow Sensor SWT03335 details;

  • Trane Chiller Thermal Flow Sensor, Switch Disp. 24V AC/DC 60 CM/S.
  • Original Trane OEM Components
  • Trane Part Number: SWT03335
  • Model Number: X13790871040
  • Commonly Used on Trane CGAM and CXAM Air-Cooled Scroll Chiller Models
  • Replaces / Supersedes: SWT-3335

Chiller documentation can be downloaded from below links;

Thermal Flow Switch

There are many applications where knowing whether there is flow or no-flow conditions of a fluid in a pipe is important.  A thermal flow switch is an option to consider to provide such positive indication of flow or no-flow conditions.  Detecting flow conditions also can be accomplished using a electromechanical paddle type flow switch.  However, a thermal flow switch operates without any moving parts and therefore is more reliable.

A thermal flow switch, also known as a thermal dispersion flow switch,  is a precise flow sensing device.  The principle sensing method is that of heat diffusion.  According to Wikipedia, “The operation of thermal dispersion flow sensing is attributed to L.V. King who, in 1914, published his famous King’s Law revealing how a heated wire immersed in a fluid flow measures the mass velocity at a point in the flow. King called his instrument a “hot-wire anemometer”. However, it was not until the 1960s and 1970s that industrial-grade thermal dispersion devices finally emerged.”

A typical thermal flow switch consists of two temperature sensors.  One sensor measures the temperature of the fluid when the sensor probe is immersed in the liquid.  The other temperature sensor is heated by a constant power.  This creates a temperature difference between the two sensors.  Temperature difference is an inverse ratio to the flow velocity.  Advantages of the thermal flow switch over the electromechanical paddle style flow switch includes:

  • Higher sensitivity,
  • Less installation restrictions,
  • No moving parts or wear and tear.

In addition, with a therm flow switch:

  • Different materials can be used for a wide range of fluids,
  • Probe length is easily made to a specific application,
  • Multiple types of output signals are available.

Application and use of the thermal flow switch can be found in water power plants, steel production, marine use, food processing, pharmaceutical manufacturing, semiconductor manufacturing and many industries where flow sensing in pipes is required.

Additional information

Weight 0.8 kg
Dimensions 15 × 15 × 10 cm
Unit Brand


Ünite Modelleri
Product Group

Flow Switch, Temperature Sensor


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