Do clear polycarbonate covers affect night vision or IR performance?
High-quality UV-stabilized covers transmit >95% of visible and IR light; cheaper alternatives scatter IR and reduce effective range by 30–50%. Always verify transmittance spec (not just 'clear') before ordering—label says nothing; datasheet does.
Can I use the same cover on cameras from different brands?
Rarely. Axis, ACTi, and Hanwha domes have different optical seat geometries, thread pitches, and thermal profiles. OEM part numbers exist for a reason—field-fitting 'universal' covers often results in vignetting, condensation traps, and misalignment.
How do I calculate thermal load for heated enclosures in winter?
Add the camera's power draw (e.g., 15 W) to the heater wattage (e.g., 50 W) and confirm total against PoE budget. Budget 90 W per camera in arctic climates—undersizing triggers brownouts across multiple sites.
What's the difference between IP66 and IP67 covers for outdoor mounting?
IP66 = high-pressure jet resistance (wash-down safe); IP67 = temporary submersion (1 meter, 30 minutes). Choose IP67 for flood-prone or below-grade mounting; IP66 is fine for elevated rooftop or wall mount. Oversizing adds cost and weight; undersizing invites field failures.
Should I use active cooling or passive vents for a camera in direct sunlight?
Passive vents are cheaper but unreliable above 40°C ambient; thermal stratification still stagnates internal air. Active cooling (24 V DC fan) is worth the power supply cost for desert, high-altitude, or equipment-dense mounting. Test in worst-case seasonal conditions before bulk deploy.
How often do protective covers need replacement or cleaning?
Clean every 3–6 months (quarterly in salt spray or dust zones); inspect for UV yellowing and micro-cracks annually. Polycarbonate typically survives 4–5 years in temperate climates; 2–3 years in harsh coastal or industrial environments. Budget replacement cycles into long-term maintenance plans.