A helpful initial step to eliminate enclosure moisture is to define the enclosure environment using a temperature/humidity data logger. These low-cost, battery-powered devices (~$200) record Dry Storage Cabinets. Additionally they 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 option can be accomplished in a quantity of ways, which range from desiccant to thermoelectric dehumidifiers-the task would be to select an alternative that is certainly inexpensive to both implement and keep. The water-absorption ability of desiccant is determined by a variety of factors (e.g., desiccant type, humidity, temperature). As an example, silica gel can absorb as much as 40% of the weight in water. A 4’ x 6’ x 2’ electrical enclosure in a hot/humid environment would saturate 125 g of desiccant in approximately two air exchanges. Therefore, the resulting frequency of required desiccant change-outs (which affects maintenance costs) is largely driven by how well the enclosures are sealed. Unfortunately, when it comes to desiccant regimes, each act of opening an enclosure to examine the desiccant may serve as an air exchange.

Dehumidifiers are comparatively cheap, although finding convenient available power inside an enclosure may be problematic. The positive feature is the fact that dehumidifiers eliminate the manual intervention connected with a desiccant regime. The negative feature of dehumidifiers is they introduce an additional device that can ultimately fail.

Another strategy is to minimize the opportunity of condensation through internal heaters (or light bulbs) to maintain the inner enclosure temperature well above dew-point temperatures. The downside is the fact that higher temperatures may be detrimental to 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-although the Dry Cabinets For PCB Storage still exists. One interesting product the makers of GORE-TEX® have produced involves screw-in vents which allow enclosures to breathe, while providing a barrier to moisture and contaminants. The idea behind this type of venting is it reduces the stress on door seals when you can find pressure differentials involving the enclosure and the environment. By equalizing pressure, the possibility of moist air at higher pressure defeating your door seals is lessened.

Moisture-hardening of electronics includes a variety of techniques. With regards to connectors, using waterproof connectors or hardening existing connectors and splices with heat-shrink tubing can be of use to minimize water intrusion and corrosion. Avoiding horizontal orientation of components like printed circuit boards inside the enclosure can minimize surfaces where condensation may collect for longer periods of time. Conformal coatings for lower-voltage printed circuit boards and using potting (see Fig. 7) of higher-voltage components greatly raise the moisture resistance of components. Potting costs vary based on the size of order, material selection jmmhra part geometry, but representative costs for really small orders (less than 10) typically fall within the range of $18 to $45 per part. An additional advantage of potting will be the added defense against shock and vibration.

Moisture protection of electronics is best approached by pursuing practices that maximize Dehumidifying Dry Cabinets during equipment installation, coupled with being prepared to mitigate failure through any one moisture-protection measure during operations. This plan, along with tracking equipment-maintenance performance to know how well moisture-protection measures work, can lead to long-term minimization of electronics moisture-induced problems. MT.

Dry Cabinets For PCB Storage – Fresh Light On A Pertinent Idea..

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