System Sensor 5603 135F Fixed Temperature Mechanical Heat Detector
Overview
The System Sensor 5603 is a fixed temperature mechanical heat detector designed to trigger at 135°F sustained temperature — the operating threshold for most commercial and industrial fire detection installations. Unlike smoke detectors, heat detectors excel in environments prone to dust, steam, or cooking aerosols (kitchens, mechanical rooms, warehouses) where optical detection fails or generates false alarms. The 5603 uses mechanical expansion sensing: no electronics, no drift compensation needed, just reliable temperature-based response. Operating at 35VDC, it integrates into conventional fire alarm loops and networked fire control panels that support fixed-point heat monitoring.
Compatibility
The 5603 is compatible with conventional fire alarm systems and networked fire control infrastructure supporting 35VDC heat detector circuits. Confirm your fire alarm panel accepts two-wire, fixed temperature detectors rated for 135°F activation. The box-style form factor suits standard ceiling and wall mounting in any facility with conventional fire alarm backbone — verify your loop termination and addressable vs. conventional circuit configuration before installation.
Installation Notes
Mount the detector on a flat ceiling or wall surface away from direct HVAC vents, windows, and thermal dead zones. Allow minimum 4 inches clearance from walls and ceiling edges to ensure proper air circulation across the sensing element. Wire as two-conductor shielded pair where required by local fire code — most jurisdictions mandate shielded runs in conduit for electromagnetic noise immunity. Verify 35VDC loop voltage at the detector terminals before final commissioning. Test the detector after installation using a heat source (heat gun or certified detector test apparatus) — never rely on visual indicators alone for final acceptance.
What's in the Box
- 1x System Sensor 5603 heat detector
- 1x mounting bracket
- 1x installation screws (qty 2)
