Rosahl solid-state micro dehumidifiers will be exhibited in the UK for the first time at the Photonex 2013, 16-17 October, Ricoh Arena, Coventry (Coventry City’s football stadium). They can be seen on the Westside International stand, no F21 in the EPIC pavilion.
The Rosahl PD3 solid state micro-dehumidifier, suitable for enclosures up to 2 litres.
Rosahl dehumidifiers have been developed specifically to protect enclosure based opto-electronic equipment from moisture damage in enclosures from 250ml to 2m³.
They are designed for industrial and commercial applications, and meet the demand for compact, maintenance-free, air drying solutions to protect sensitive devices from moisture damage. They are particularly popular in the photonics and other industries due to their ultra-compact design and long service life.
Rosahl’s solid-state polymer membrane dehumidifiers use electrolysis to remove water vapour from the enclosure when a 3V dc current is applied. There are no moving parts, so Rosahl dehumidifiers are silent and vibration-free. The process is also maintenance-free and these ionic membranes have a low running cost.
Electrolysis
When a voltage is applied to the porous electrode attached to the membrane the moisture on the anode side (dehumidifying side) dissociates into hydrogen ions (H+) and oxygen: the hydrogen ions migrate through the membrane to be discharged on the cathode (moisture discharging) side where they react with oxygen in the air, resulting in water vapour being discharged.
By reversing the membrane a humidifying effect is achieved: using two membranes and a suitable controller it is also possible to achieve a balanced environment. Rosahl technology is effective at temperatures down to -20º C and can reduce humidity to below 10%.
Rosahl is the world’s smallest electric dehumidifier, and the two litre enclosure version is 75% smaller than an AA dry cell. For enclosures over 2m³, multiple units may be installed.