Wide-temperature selection often only depends on the temperature. What actually causes premature equipment failure is moisture: condensation, creepage, metal corrosion and end surface contamination. This article gives a general checking sequence for environmental reliability design, which does not depend on the specific cabinet type.

Two paths of damage caused by moisture

One is water vapor migration. Moisture enters through openings, cable entrances and aging sealing strips, and accumulates on the surface of metal parts and solder joints, forming long-term corrosion and leakage channels. The other is condensation. The temperature inside the cabinet drops below the dew point, and water vapor forms a film on the circuit board and terminals, which can range from parameter drift to ignition at the moment of power-on. Two paths coexist along the coast, in underground pipe galleries, and in outdoor cabinets with large temperature differences between day and night. Simply improving the sealing level of the shell cannot solve internal condensation.

Protection level and heat dissipation should be weighed together

The higher the IP level, the better the airtightness, and the worse the heat dissipation. The internal temperature of an outdoor fully enclosed cabinet will rise significantly at high temperatures, which eventually becomes a temperature problem. The general approach is to first estimate the heat dissipation needs based on internal power consumption, and then decide on the level: cabinets with smaller power consumption can choose high sealing levels with anti-condensation heating or semiconductor dehumidification; cabinets with larger power consumption are more suitable for ventilation solutions with filters, and control the air inlet position to avoid the air inlet facing direct sunlight. Sealing strips and filter cotton are consumables and should be included in the inspection cycle rather than left alone after installation.

Five details of on-site inspection

  • Whether the inlet and outlet holes are blocked, and unused knock-out holes must be closed;
  • Whether there are drainage and ventilation channels at the bottom of the cabinet, and whether condensed water will accumulate on the bottom plate;
  • The amount of compression of the sealing strip and the condition of aging and cracking, corners are the easiest to detach;
  • Is there a replacement cycle record for the desiccant or dehumidification device?
  • Check whether the connector is clean and dry before putting it on the machine. Contamination on the end face in a humid environment will directly increase the insertion loss. If necessary, useLC-LC single mode dual core jumperThis type of finished jumper can be replaced as a whole.

Moisture vapor and static electricity belong to the same set of environmental management: if the humidity is too low, static electricity will be active, and if the humidity is too high, the risk of condensation will increase. The outdoor introduction section of the park and the building can be combinedCampus network and FTTH integrated cabling solutionCheck the sealing process. If you need confirmation, contact Wolflight at 0755-83179002.