The present invention relates to dehumidification equipment and more particularly, to a dehumidification system and method for use in hazardous locations. Patterned ohmic contact metal regions are formed on the barrier layer and annealed to provide first and second ohmic contacts. The first biasing circuit includes a first resistance, and the second biasing circuit includes a second resistance. The device includes a carrying medium which may be a film or opposed substrates that are sealed. A flash and voltage controller chip on the SD card has a controller core that operates at the reduced voltage.