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Dehumidifying Dry Cabinets – View Online..

A good first step to remove enclosure moisture is to characterize the enclosure environment using a temperature/humidity data logger. These low-cost, battery-powered devices (~$200) record Electronic Dry Cabinets. They also indicate the dew-point conditions in the enclosure (Fig. 6). Maintaining enclosure temperatures above dew-point temperatures is a necessity for condensation prevention.

Pursuing this choice can be accomplished in a quantity of ways, which range from desiccant to thermoelectric dehumidifiers-the process is to select an option that is certainly inexpensive to both implement and maintain. Water-absorption ability of desiccant is dependent on many different factors (e.g., desiccant type, humidity, temperature). For instance, silica gel can absorb up to 40% of its weight in water. A 4’ x 6’ x 2’ electrical enclosure in a hot/humid environment would saturate 125 g of desiccant in about two air exchanges. Therefore, the resulting frequency of required desiccant change-outs (which affects maintenance costs) is essentially driven by how well the enclosures are sealed. Unfortunately, in terms of desiccant regimes, each act of opening an enclosure to examine the desiccant serves as an air exchange.

Dehumidifiers are relatively inexpensive, although finding convenient available power inside an enclosure may be problematic. The positive feature is that dehumidifiers remove the manual intervention associated with desiccant regime. The negative feature of dehumidifiers is that they introduce one more piece of equipment that can ultimately fail.

Another method is to minimize the chance of condensation through internal heaters (or light bulbs) to maintain the interior enclosure temperature well above dew-point temperatures. The downside is the fact that higher temperatures may be detrimental for some heat-sensitive electronic components, as well as the higher temperature actually allows the air to hold more moisture. Venting and fans can aid in avoiding condensation in some situations-even though the Dry Storage Cabinets For Optics still exists. One interesting product the designers of GORE-TEX® have produced involves screw-in vents that enable enclosures to breathe, while providing a barrier to moisture and contaminants. The idea behind this sort of venting is it reduces the stress on door seals when there are pressure differentials between the enclosure as well as the environment. By equalizing pressure, the chance of moist air at higher pressure defeating your home seals is lessened.

Moisture-hardening of electronics includes many different techniques. In terms of connectors, using waterproof connectors or hardening existing connectors and splices with heat-shrink tubing can be useful to reduce water intrusion and corrosion. Avoiding horizontal orientation of components like printed circuit boards in the enclosure can minimize surfaces where condensation may collect for longer amounts of time. Conformal coatings for lower-voltage printed circuit boards and the use of potting (see Fig. 7) of higher-voltage components greatly boost the moisture resistance of components. Potting costs vary in accordance with the size of order, material selection jmmhra part geometry, but representative costs for very small orders (under 10) typically fall in the range of $18 to $45 per part. An extra advantage of potting will be the added protection from shock and vibration.

Moisture protection of electronics is better approached by pursuing practices that maximize Dehumidifying Dry Cabinets during equipment installation, coupled with being prepared to mitigate failure through anyone moisture-protection measure during operations. This strategy, along with tracking equipment-maintenance performance to comprehend how well moisture-protection measures are working, can lead to long-term minimization of electronics moisture-induced problems. MT.

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