Removing water vapour and avoiding condensation damage in electrical cabinets

Removing water vapour and avoiding condensation damage in electrical cabinets

Found water in the bottom of your electrical cabinet or traces of rust and corrosion on terminals and devices? Your first thought maybe to check for a water leak, but condensation may well be the cause.  Even small amounts of water can reduce the performance life of equipment and cause extensive and expensive damage.  Even without the presence of water, water vapour can cause rusting/oxidation on exposed surfaces leading to increased resistance of joints, local heating and even short circuits.

The air’s capacity to hold water vapour increases as air temperature increases.  For example, air at a temperature of 30°C can hold more than three times as much water vapour as air at 10°C.  In this situation a 1m3 cabinet at 30°C can hold <30g of water as vapour: as the air cools the dew point is reached and some of the water vapour condenses to a liquid.

humidity graph3 Removing water vapour and avoiding condensation damage in electrical cabinets

Water vapour held by air

 

There are several recognised methods of reducing problems caused by internal condensation.  These include: desiccants, anti-condensation heaters and drainage system.  The most innovative and effective solution is by using a ROSAHL ionic dehumidifying membrane.  ROSAHL is compact and silent, requires low power, and is maintenance free throughout its long operational life.

When a a low voltage electrical charge is applied to a ROSAHL membrane mounted on the side of the enclosure it uses electrolysis to decompose the water vapour and expel to to the outside keeping moisture levels inside the enclosure to safe levels