Functionality / Efficiency
Depending on the field of application, our adsorbers are provided with different fillings: Activated carbon adsorbs non-polar substances immiscible with water and is suitable for adsorption of odors, oil mists, vapors and other pollutants. Molecular sieves are excellent for selective separation of gases and for very strong drying of air in the ventilation of optical equipment. Silica gels have become the standard in aeration dryers because their absorption capacity is about 40%, the color indicator is highly visible, and easy regeneration is possible. Silica gel filters dry the air to an average of 10% RH.
Hydrophobic membranes can also be used for adsorption. However, it should be noted that these are not capable of separating water molecules from the air and only separate mist and water droplets. If humidity is to be separated, a desiccant is always required.
The use of nitrogen also protects containers from contact with humid air, but requires considerably more effort. Combined use is also not recommended, as the expensive nitrogen would continuously escape through the adsorber.
After mounting an adsorber, moisture from the ambient air should not normally enter the system. If there is nevertheless water in the system after a certain time, check whether there are other air openings, such as cylinder seals or damage.
If water is already dissolved in a hydraulic oil, it can no longer be absorbed by the adsorber. In this case, active drying is recommended.
When aerating plastic containers (e.g. IBC), an adsorber without valves should be used, contrary to the general recommendation. These containers react to negative pressure, so that adsorbers with a minimum pressure build-up are more suitable.
If a plant is operated at permanently low humidity, the use of a respiratory dryer is not necessary. Adsorbers are used when plants contain hygroscopic liquids, air humidities from 70% rH and ambient temperatures from 25°C prevail or the plants are exposed to temperature fluctuations of +/- 10°C.
In addition, air displacement volume and air flow rate play an important role in determining a suitable adsorber.
Adsorbers are usually mounted vertically, with the connection at the bottom. This type of mounting ensures that the desiccant is evenly distributed and the air inlet openings are protected from the weather, which increases the IP protection.
When mounted horizontally, adsorbers, series 3 and above, can create an air pocket that affects drying efficiency. In addition, a greater leverage force acts on the connection here, and damage cannot be ruled out. From series 3 (diameter 110mm), a different type of mounting (e.g. by means of a wall bracket) is therefore recommended.
If the adsorber is mounted from top to bottom, it is important to prevent the ingress of dirt or water through the openings. If the adsorber is installed outdoors, a specially manufactured adsorber of the TB or TM series should be used.