TB-RV series

The GIEBEL adsorbers of the TB-RV series are used for the aeration of transformers. They have a stable valve part made of glass fiber reinforced polyamide and are designed with a refillable adsorber cartridge. This ensures long maintenance intervals and favorable maintenance costs.

Thanks to the valve part, the adsorbers are optimally suited for extreme, dusty ambient conditions. The large valve cross-section ensures minimal pressure build-up – even at high air flows. In addition, the series contains an activated carbon layer to separate escaping oil mist. This ensures cyclic self-regeneration and thus very long maintenance intervals. The hanging version is available with all standard connections for transformers.

Structure and added value

1DIN connections:
Available with all DIN connections

Refillable version ensures favorable operating costs

Clean supply air due to integrated 2μm fibre glass filter

4Self regeneration:
Increase in utilization times through the use of activated carbon

Efficient desiccant with harmless color indicator from orange – green

Protection against unnecessary loading. Valves ensure long service life

Method of operation

Adsorber – supply air filtration

  • 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


Product flyer
Food Conformity Sample
Customs information
EAC Template
REACH Compliant
IP Protection Class IP66
RoHS Compliant
Corosivity Class C4
CE Conformity

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