is a UK-based specialist in solid-state humidity control systems for OEM and infrastructure applications. We have over fifteen years’ experience  integrating Rosahl ionic membrane dehumidifiers Recently introduce products include  passive humidity buffering to stop condensation in powered and unpowered enclosures Our intelligent digital controllers enable the accurate humidification and/or dehumidification of sealed enclosure enclosures worldwide.

Rosahl is a unique family of electric micro-dehumidity controllers for enclosures where maintenance-free drying is an key factor.

The Mitsubishi Electric Corporation in Japan developed Rosahl. It was in response to demand for compact and maintenance free air-drying solutions to protect sensitive equipment from moisture damage. It has since found its way into a wide range of other uses. These include for protecting museum display cabinets, telecoms. equipment, LED lighting, lasers, instrumentation, and electrical cabinets and more.

Rosahl membranes are suitanle for a  wide variety of enclpsure applications and environments from -20° to +50° C

Enclosure dehumidification has many differing needs. At micro-dehumidifier.com, we have the answers. Rosahl  – Active Moisture  Removal and Intelligent Digital controllers and sensors.

For powered and unpowered application there are our the  Drykeepers – Condenstation stopping  Passive Buffers

To support these we have a comprehensive range of enclosuress, power suplied and accessoories.

Benefits of Rosahl dehumidifiers

Equipment failure due to moisture has major cost implications for OEMS, machine builders and end-users, but is simple to avoid.

Rosahl solid-state electric dehumidifiers also protect sensitive electronic and optical equipment from long-term moisture damage.

From by a leading global manufacturer, Rosahl uses a compact solid polymer electrolyte (SPE) membrane for long-term maintenance-free drying.

Rosahl is a unique family of electric micro-dehumidity controllers for enclosures where maintenance-free drying is an key factor. The Mitsubishi Electric Corporation in Japan developed Rosahl. It was in response to demand for compact and maintenance free air-drying solutions to protect sensitive equipment from moisture damage. It has since found its way into a wide range of other uses. These include for protecting museum display cabinets, telecoms. equipment, LED lighting, lasers, instrumentation, and electrical cabinets and more.

Sealing alone does not prevent condensation. When air trapped inside an enclosure cools below its dew point, water vapour condenses on the coldest surfaces. Night-time temperature drops, solar loading cycles, and environmental fluctuations repeatedly drive this process in outdoor installations.

The result is corrosion, leakage currents, optical fogging, sensor drift, and intermittent electrical faults.

Solid-state membrane dehumidifiers prevent condensation by continuously removing water vapour from enclosed volumes before saturation occurs.

A solid-state dehumidifier removes water vapour without compressors, refrigerants, or replaceable desiccants. Ionic membrane technology transfers moisture across a selective membrane using controlled electrical potential, enabling continuous vapour removal in sealed environments.

Unlike heater-based drying or silica gel systems, membrane dehumidifiers are designed for long-term operation in closed cabinets where moisture must be actively controlled rather than periodically absorbed.

Rosahl membrane dehumidifiers, manufactured in Japan, are widely used in sealed outdoor cabinets, CCTV systems, telecom enclosures, photonics instruments, and industrial automation equipment.

Westside International Ltd specialises in the technical integration and application of Rosahl dehumidifiers within OEM and infrastructure systems.

Key characteristics:

• Continuous vapour transfer

• No refrigerant or compressor

• No moving parts

• Long operational service life

• Suitable for 24/7 operation

• Optimised for sealed enclosures

CTA: Technical Overview of Rosahl Dehumidifiers

Beyond individual membrane devices, we design integrated humidity control architectures tailored to application requirements.

Active Vapour Removal

Rosahl ionic membrane dehumidifiers provide continuous moisture extraction.

Passive Humidity Buffering

Drykeeper humidity control sheets absorb and release moisture to moderate humidity fluctuations, particularly in low-power or hybrid systems.

Intelligent Optimisation

Digital humidity controller modules enable dew-point-based activation, energy optimisation, and system-level control.

Together, these technologies form a solid-state humidity control system designed to reduce maintenance, improve reliability, and extend equipment life.

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Compared to traditional methods, solid-state systems provide:

• Continuous vapour removal rather than intermittent drying

• No desiccant replacement cycles

• No refrigerant compressors

• Lower power consumption than heater-based evaporation

• Long lifecycle operation

• Reduced total cost of ownership

For sealed enclosures operating in demanding outdoor or industrial environments, membrane-based humidity control offers predictable, engineering-led reliability.

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Westside International Ltd is a UK-based specialist in membrane dehumidifier integration for OEM and infrastructure applications worldwide. We support customers with application analysis, system architecture guidance, and long-term reliability strategies for sealed enclosure environments.

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