Be sure to fully tighten the lock nut after mating (hear the "click" sound or turn back half a circle after tightening to avoid thread slipping), ensure the sealing ring is compressed in place to exert the original protective performance.
Add special dust caps to both plug and socket in non-use state, physically isolate the exposed port from the external environment, and block the direct entry of dust and water vapor.
Route cables with connector ports facing down or horizontal to avoid rainwater/dust accumulation; an additional waterproof sheath can be installed for outdoor use to further upgrade the protection level.
Technical Note: Tightening the lock nut is the basis for ensuring the original protection of the connector; the combination of dust cap and reasonable layout is the key to improving on-site protection, which is especially important for M9 connectors used in outdoor or dusty industrial environments.
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