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Topic: Moisture issues

User: rrr_usty, Location: Colorado

Asked on: Wednesday, March 16, 2011 at 8:40 pm EDT
Answered on: Tuesday, May 14, 2024 at 2:54 am EDT

Question: My application is unique, Equipment that has 4X enclosures with cord grips to feed motors, etc. are designed to keep water out, The issue becomes how to keep condensation out of the enclosure.The equipment gets washed down with warm water and then gets after a chemical agent is used very hot water (from steam) whenever we have to get into the enclosure, all of the components have condensation on them, I am trying to come up with a method in which we can keep the inside free from moisture.I have thought of a positive pressure inside the cabinet, by use of a very small compressor inside the cabinet, but for that to work, we need some supplemental air.Any ideas ?

Moisture Control Methods1. Positive Pressure Ventilation

Install a small, low-power compressor inside the enclosure to maintain a positive pressure. Introduce supplemental air through a filter to prevent dust and moisture ingress.

2. Desiccant or Silica Gel

Place desiccant bags or silica gel packets inside the enclosure to absorb moisture. Regularly replace or regenerate the desiccant to maintain effectiveness.

3. Thermoelectric Cooler

Install a compact thermoelectric cooler inside the enclosure to create a cold spot. Condensation will form on the cold spot, removing moisture from the air. Ensure proper heat dissipation for the cooler to avoid overheating.

4. Ventilated Enclosure

Modify the enclosure design to include ventilation holes or louvers. Install mesh or filters over the vents to prevent moisture ingress. Ensure adequate airflow through the enclosure to prevent condensation.

5. Sealed Containers

Store sensitive components inside sealed containers or bags. Include packets of desiccant or silica gel inside the containers to absorb any residual moisture.

6. Heat Trace

Install a heat trace around the circumference of the enclosure to maintain a slightly elevated temperature. Warm air will prevent condensation from forming on the inside surfaces.

7. Anti-Condensation Coatings

Apply anti-condensation coatings to the interior surfaces of the enclosure. These coatings repel moisture, preventing condensation from adhering.

Supplemental Air Sources
Filtered Air Line

Connect the compressor to a filtered air line to provide a continuous supply of clean, dry air.


Purged Enclosure

Install a purge valve at the bottom of the enclosure. Introduce filtered air into the enclosure at a low flow rate to create a positive pressure and prevent moisture ingress.*

Breathing Valve:
Install a breathing valve on the enclosure that allows air to enter or exit as pressure changes. This can help prevent moisture from entering when the enclosure is under vacuum. Flag for review

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