PAD300-PHD Photoelectric Smoke and Heat Detector

The Potter PAD300-PHD is a reliable analog addressable fire alarm detector that combines photoelectric smoke detection with an integrated heat sensor providing both rate-of-rise and fixed temperature response. It communicates via the Potter PAD (Potter Addressable Device) SLC loop and transmits its analog sensitivity values directly to the fire alarm control panel for real-time monitoring. The low-profile, off-white housing blends discreetly into commercial ceilings, while built-in drift compensation and a dirty detector indicator reduce nuisance fire alarm signalling from gradual dust accumulation over the detector's service life.

The combination of photoelectric smoke detection with heat sensing in a single addressable device makes the PAD300-PHD one of the most versatile commercial smoke detectors in the Potter PAD300 series. It is ideal for commercial buildings, light industrial facilities, and mixed-use spaces where a single detector type must address the broadest range of fire scenarios. The heat element's rate-of-rise detection responds rapidly to fast-flaming fires, while the fixed temperature element provides a fail-safe backup regardless of the rate of rise — giving the PAD300-PHD detection capability across both fast-flaming and slow-smoldering fire types that the smoke-only PAD300-PD cannot cover alone.

For fire alarm parts suppliers and fire alarm equipment supplies contractors, the PAD300-PHD is a premium specification option providing the capabilities of both a commercial smoke detector and a commercial fire detector in a single addressable head. Like all PAD300-series detectors it mounts on the PAD300-4DB (4-inch) or PAD300-6DB (6-inch) smoke detector mounting base sold separately, maintaining a consistent installation platform with the PAD300-PD across mixed detector installations. Annual testing using a listed smoke detector tester spray for the photoelectric chamber and a fire detector tester for the heat element is required per NFPA 72. Fire alarm inspection and test records must document both test results and fire alarm inspection stickers updated after each cycle.

Placement for Commercial Buildings

Install the PAD300-PHD per NFPA 72 spacing requirements for combination smoke and heat detectors in commercial buildings. The more restrictive of smoke detector or heat detector spacing criteria applies — consult the NFPA 72 design tables for your specific ceiling height and occupancy. For smoke detectors for commercial buildings with high airflow or variable temperatures, the heat element's rate-of-rise function may require special placement consideration to avoid nuisance fire alarm signalling from HVAC-driven temperature swings.

Annual Smoke and Heat Testing

Both detection functions must be tested annually per NFPA 72. Use a listed smoke detector tester spray or smoke detector test smoke for the photoelectric chamber, and a listed fire detector tester for the heat element. Never use open flame for heat detector testing — use only smoke detector testers and fire detector tester tools. Verify alarm response at the fire alarm control panel for both functions independently. Document all results in the fire alarm inspection and test records. Update fire alarm inspection stickers and fire alarm tags after each test cycle. A smoke detector checker is appropriate only for the photoelectric chamber — verify the heat element with a separate listed heat detector tester.

What is the difference between PAD300-PD and PAD300-PHD?

The PAD300-PD is a photoelectric smoke-only commercial smoke detector. The PAD300-PHD adds an integrated heat sensor for combined smoke and heat detection. Both are commercial fire detector options in the PAD300 series — specify the PHD for locations where both detection types are required. Both mount on the same PAD300-4DB or 6DB smoke detector mounting base.

How does drift compensation reduce nuisance alarms?

The PAD300-PHD's drift compensation automatically adjusts its alarm threshold as environmental contamination (dust, aerosols) gradually accumulates in the sensing chamber. Without this feature, commercial smoke detectors for commercial buildings in dusty environments would generate increasing numbers of nuisance fire alarm signalling events over time as the chamber becomes dirty. Drift compensation maintains stable alarm thresholds between annual smoke detector test cycles while still alerting maintenance personnel via the dirty detector indicator when cleaning is needed.

Is a smoke alarm tester the same as a smoke detector tester spray?

A smoke alarm tester is typically used for residential units. For commercial smoke detectors like the PAD300-PHD, use a listed smoke detector tester spray or smoke detector tester can specifically rated for commercial addressable photoelectric detectors. The smoke detector spray tester near me should be a listed product per NFPA 72 testing requirements — consult your fire alarm supply store for the appropriate tester for PAD300-series detectors.