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

Equipment failure due to moisture damage has major cost implications for OEMS machine builders and end-users but is easily avoided.

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

Developed by a leading global manufacturer, Rosahl micro-dehumidifiers use a compact solid polymer electrolyte (SPE) membrane for long-term maintenance-free drying.

Micro-dehumidifiers are suitable for a enclosure volumes from 250 ml up to 8m³ (140 cu ft).

Waterless process
No noise or vibration
Ultra compact
Maintenance free
Small energy footprint
Operates from -20° C to +50° C
For enclosures from 250ml to 8m³
To find out about our range of moisture beating products and humidity control, please get in touch.


QC tested


Warranty failures

Customers worldwide


  • Compact size
  • No moving parts
  • Solid-state membrane
  • Long operating life
  • Robust performance
  • Reduces humidity by electrolysis
  • Lower total cost of ownership


  • Fits enclosures sizes from 250ml to 8m³
  • Vibration free, silent operation
  • High reliability with low energy footprint
  • Suitable for hard to access equipment
  • Operates from -20° C to +50° C
  • No liquid water involved
  • No maintenance, draining or cleaning

Rosahl from Westside

  • Tens years’  specialist application support
  • Consultancy service
  • Complementary products
  • Proven reliability
  • 100% QC tested

Rosahl works using electrolysis

Rosahl uses a specialised ionic membrane like that found in fuel cells, chemical engineering, water improvement and similar industrial processes. It works as an ionic pump to move humidity into or out of a sealed enclosure. When a 3 Volt D.C. charge is applied to the solid-state membrane, the moisture dissociates into hydrogen ions (H+) and oxygen. The hydrogen ions (not hydrogen gas) migrate through the membrane to be discharged outside the enclosure where they react with oxygen in the air to form water vapour.

Typical applications

  • Laser processing systems
  • LED lighting
  • Instrumentation
  • FLIR
  • Medical and x-ray equipment
  • Precision equipment storage cabinets
  • Museum displays and exhibition cabinets
  • Protecting sensitive opto and electronic devices
  • Storage of hygroscopic materials
  • Infrared spectrographs
  • CCTV
  • Control panels

Get in touch

Here are a few ways to get in touch with us:

Call: +44 (0)203 286 8189

email: steve.jones@westside-int.com

or simply fill in the form and we will get back to you shortly.


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Westside International Ltd

Registered in England

Registration No. 4018025

VAT No. 768327395

EIN 98-1234498