In order to permanently ensure the function of technical systems and to avoid failures due to contaminated fluid, the overall ventilation is optimised by means of an aeration dryer. While dirt particles from a size of 3µm are separated, the effect of complete air drying is added. For example, a GIEBEL Adsorber® of the VARIO PA series is mounted on hydraulic tanks. Designed for the tank volume, the incoming air is initially dehumidified to 2%rh (average 10%rh). In addition, these adsorbers protect a hydraulic tank without large oscillating movements (e.g. oil circulation lubrication) against unnecessary contact with the ambient air and thus considerably extend the maintenance intervals.
No matter what insulation or temperature control the building will have in the future. For example, to contaminate synthetic esters with water from the air, the room temperature must drop by approx. 25°C when using an aeration dryer. However, this difference is rare and the water content in the system due to the previous drying is very low.
To extract the water from the air, a highly hydrophilic substance is used in the aeration dryer. In most cases silica gel is used. This synthetically produced fine-pored solid consists of 99% amorphous silicon dioxide. It attracts polar substances very strongly and binds them.Due to its low price, silica gel is one of the most frequently used drying agents in the field of air drying. It can absorb up to 40% by weight of water. Chemical additives such as iron salt can indicate the degree of saturation of the water by a change in colour.
Further information on ventilation dryers from GIEBEL can be found at ...