+44 203 286 8189 steve.jones@westside-int.com

Lower lifetime costs

Rosahl low-energy dehumidifiers use a solid polymer electrolyte membrane (SPE) to lower lifetime costs of dehumidifying steady state enclosures. They are suitable for enclosures from less than one litre to 4m³. Steady state enclosures are those sealed to minimise to ingress of moisture.

The drying process

Rosahl membranes use electrolysis to extract water vapour from the container by removing the hydrogen ions and passing them through the membrane to the outsides. Importantly, no liquid water is involved in the dehumidifying process. This makes it virtually maintenance-free.  Go here to see how Rosahl works

Drying curves

The table shows typical drying curves for a 50 litre container using a range of membranes. On the other hand, a larger container will take longer to dry.

Image of Rosahl drying performance for a 50 litre enclosure

Thumbnail size

Rosahl membranes use no moving parts so the process is silent and free from noise and vibration. The smallest membranes are the size of a thumbnail. To operate they require only a 3 Volt DC supply and very little power so the average annual running costs are very low. In addition to the low running costs. Consequently, the membranes have a long operating life for lower lifetime costs giving the user lower ownership costs of ownership (TCO).


Typical applications

Due to their compact size and maintenance free operation. Firstly, they are ideal for reducing lower lifetime costs. Secondly they are suitable for use in remote applications, In addition, they can be used for equipment where regular servicing is difficult or impossible applications. Finally, the absence of maintenance also offers significant cost savings for the end user.

Examples of typical applications include

Traffic control and display cabinetsExternal LED lighting
IP and CCTV cameras FTIR spectrographs
Mobile telecommunications outstationsLaser and Piezo systems
Protecting sensitive electro-optic devicesPrecision medical equipment
Museum displays and exhibition cabinetsOutdoor multimedia screens and displays


For FAQs go here

For product range go here

Advantages of Rosahl micro-dehumidifiers


Silent & vibration free

Rosahl dehumidifiers have no moving parts so, meaning is no noise or vibration when operating.


Maintenance Free

Rosahl requires no regular maintenance, meaning reducing total cost of ownership (TCO)

Long Operating Life

Rosahl uses a solid-state ionic membrane, meaning it has a long service life and low operating costs

Low Energy Footprint

Rosahl membranes operate at 3V d.c. and use a very low average operating current, meaning lower running costs


Ultra Compact

75% smaller than an AA battery, neaning Rosahl can be used in enclosures from 250ml

Operates Below Freezing

Tested to -20°C, Meaning Rosahl may be used for internal and external applications

No moving parts

Rosahl dehumidifiers have no moving parts, meaning there is no noise or vibration when operating and nothing to wear our or service

Solid-state membrane

Solid-state polymer electrolyte (SPE), meaning reliable operation with low average power consumption and a long service life

No liquid water

The process works at a molecular level, meaning no liquid water is involved, so no cleaning or drainage are needed