The TB-DV series

Adsorbers of the TB-DV series are transformer dehumidifiers with an economical disposable cartridge. They have a stable valve part made of glass fiber reinforced polyamide and can be installed within a few minutes. A major advantage of the TB-DV series are the valves, which eliminate the need for an oil reservoir and the associated maintenance. In addition, the cartridges can be replaced as part of our Send & Refresh system.
The suspended version is available with all standard connections for transformers. In addition, this series contains an activated carbon layer to separate escaping oil mist. This ensures cyclic self-regeneration and thus very long maintenance intervals.

Move the mouse pointer over the blue highlighted adsorber components of the TB-DV and learn which task they perform in the adsorber.

Mode of operation

Adsorber – Drying the supply air

  • Level in transformer decreases
  • Humid air is sucked in
  • Valves open at 5 mbar
  • Uniform flow
  • Air is dried up to 2%rH
  • Silicagel changes color
  • Air is filtered up to 2μm

Dry and clean supply air

Desorption – Separation oil particles

  • Level in transformer increases
  • Dry, oily air is squeezed out
  • Activated carbon absorbs all oil particles
  • Dry, oil-free air regenerates silica gel

Self regeneration and oil-free exhaust air

Technical Data


The sucked-in air opens the valves in the lower part of the adsorber already at approx. 5 mbar. After flowing into the adsorber, the air is distributed evenly over the cross-section. A pre-filter disc removes coarse dirt particles from the air.

When the desiccant silica gel flows through, the water molecules are reliably removed from the air. The gap volume of the granulate is optimally selected with 2 to 5 mm grains and guarantees a minimum pressure build-up with simultaneous very good drying efficiency. Thus, at the beginning of the drying process, a residual air humidity of max. 2 % rH and a dew point of -40 °C are achieved. Due to the water absorption, the silica gel in the standard turns from orange to green, indicating the end of the product life cycle. 3 µm filter pad ensures that all dirt particles are separated from the ambient air and the silica gel and that the connected transformer is not contaminated.

In the case of outgoing air, the activated carbon prevents contamination of the silica gel and thus blocks the water-absorbing pores, allowing the adsorber to self-regenerate.

These adsorbers are made of aluminum, polycarbonate, polyamide, silica gel orange, FKM and can be used for the ventilation of all transformers by means of all DIN connections.

Pressure ratio

Spare part kits

Sustainability starts with using product components for as long as their life cycle allows and replacing only those components that show signs of wear. With our spare parts kits for the refillable adsorber series, we ensure that you can replace each individual component of an adsorber as needed.

For example, the desiccant in our adsorbers becomes loaded during use, increasingly loses its ability to adsorb moisture and needs to be replaced, but the adsorber housing is particularly durable. Our refillable adsorbers can therefore be easily opened and the desiccant replaced. Seals, particle filters & activated carbon discs, on the other hand, can withstand a few replacement cycles, depending on the load. However, we recommend replacing them after 4-5 replacement cycles at the latest to ensure smooth operation of the adsorbers.

Our spare parts kits include seals, particle filters, activated carbon discs and other components that match the respective adsorber series. The matching desiccants for the adsorbers are available separately and in different size classes.

Adsorber Spare part kit