NS-AH/A1S

Inspect optical chamber visibility and sensor cleanliness; check for dust, debris, or discoloration on lens surfaces; verify LED light transmission through optical window; perform visual cleanliness assessment per EN54-7 maintenance procedures

Verify temperature sensing element operation via control panel diagnostics; check for slow response times; test thermal elements using heat gun at specified setpoints (54°C for A1R, 84°C for CS class); confirm rate-of-rise functionality within 0.8°C/min tolerance

Verify unobstructed line-of-sight between flame detector and protected area; check for window/lens blockage on UV and IR detectors; inspect for dirt accumulation on sapphire glass filters (AC-IR-3Fq); confirm 100-degree field of view clearance for UV detectors

Inspect all connections for corrosion or green patina; verify waterproof seals on IP67-rated detectors (HC100 A2-IP67, CS-MCP WP); check for loose terminal pins; test continuity of detector loops; ensure proper strain relief on cables in high-vibration areas

Verify DIP-switch settings match commissioning documentation (NS-AOS N11111, NS-AOHS N11250, NS-AH detectors); perform address conflict scan via control panel; test loop communication at each detector node; confirm alarm signal generation and LED indication (red LED on alarm)