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<strong>What is a dry cabinet?</strong>
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A <a href="http://www.gms-industrial.com/dry-cabinet/" target="_self">dry
cabinet</a>, also called dehumidifying cabinet or dry box, is a storage solution
used to protect sensitive items from excess humidity. These devices are used
across many industries, but they are particularly popular for sensitive camera
equipment storage. The main issue dry cabinets serve to fight is fungal growth.
Cameras and camera lenses are susceptible to fungus given the right conditions –
darkness and excess humidity.
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Dry cabinets come in various shapes and sizes and there are different
technollogies available. For example, there are <a href="http://www.gms-
industrial.com/dry-cabinet/standard-dry-cabinet/" target="_self">Standard Dry
Cabinet</a>, <a href="http://www.gms-industrial.com/dry-cabinet/dry-nitrogen-
cabinet/" target="_self">Dry Nitrogen Cabinet</a>, <a href="http://www.gms-
industrial.com/dry-cabinet/baking-dry-cabinet/" target="_self">Baking Dry
Cabinet</a>, <a href="http://www.gms-industrial.com/dry-cabinet/optional-
configuration/" target="_self">Optional Configuration</a> or even <a
href="http://www.gms-industrial.com/dry-cabinet-custom-made-solutions/"
target="_self">Dry Cabinet Custom-made Solutions</a>. As opposed to it's name,
a dry cabinet's purpose is not to provide an environment devoid of any
humidiy, as this might actually be detrimental to the equipment encased within.
Much like a cigar humidor, the dry cabinet’s job is to maintain an optimal
relative humidity. Most dry boxes are equipped with a hygrometer to allow you to
check the humidity level inside.
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<strong>How does a dry cabinet work?</strong>
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Dry boxes can be broadly divided into two categories: active and passive. A
passive model utilizes a dessicant inside an airtight sealed box, and typically
offers limited control over the humidity level. These boxes require no electricity
to operate, but need regular dessicant changes (or reactivation for multiple-use
dessicant), especially when activelly used. Therefore, a passive dry box is a good
solution when power consumption is an issue, for example in an off-the-grid
application. For regular home use, an active dry cabinet is generally a simpler
and more effective solution.
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The typical active dehumidifying cabinet is an enclosure with electronic
humidity control that automatically maintains a stable relative humidity (RH) at a
preset level. Simpler models usually feature a small Peltier element to condense
and remove the air-bourne moisture. More advanced models operate using multi-
porous molecular sieve desiccants with automatic regeneration mechanisms. <a
href="http://www.gms-industrial.com/dry-cabinet/electronic-dry-cabinet/"
target="_self">Electronic Dry Cabinet</a> is much more precise and reliable than
passive models, but do require a constant power source.
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<strong>Do you need a dry cabinet?</strong>
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Whether or not you need a dry cabinet depends on your location, climate, gear
and use patterns. Climate is generall the number one factor determining the need
of such a device. If you live in a warm, humid climate like Southeast Asia or
equatorial states, chances are a dehumidifying cabinet would be a wise purchase.
Even the cooler temperate climate can provide enough moisture to cause trouble in
the right conditions, especially in seaside areas.
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Usage patterns are the second most important factor when you consider a dry
cabinet for your equipment. If you constantly use your gear, day in and day out,
the chances of it developing moisture related issues is minimal even in a
moderately humid climate. Having the cameras out in the open, in sunlight and air,
would usually suffice to prevent fungal growth in all but the most extreme cases.
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On the other hand, if you find yourself storing your equipment for several
months at a time, you might find a nasty surprise under a lens cap one day. The
risk of fungus issues increases if you often work in wet, dewey conditions. In a
humid environment, gear will accumulate moisture even if kept out of the rain.
Putting away equipment in a dark, warm cabinet after such a shoot is a great way
to grow some fungi.
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<strong>What is the optimum humidity for camera storage?</strong>
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Using a dry cabinet for camera storage is a straighforward process. The amount
of work you have to do depends on the type of enclosure you are using. With an
active dry box, the only thing you need to do is to set the desired humidity level
and let the electronics do their work. Best humidiy level for camera storage is
around 40-45%. If you are using a passive dry box, you need to add enough
dessicant to keep the humidity close to these numbers.
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Too dry can be almost as bad as too humid, which is why using a dry box
without means of controlling the actual relative humidity inside is a bad idea.
Storing your gear in an enclosure with extremely low humidity will affect rubber
parts, leatherette, certain plastics, lubricants and some electronic components.
Electrostatic build up is also a danger when humidity is kept too low.
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