Air Products & Controls SM-501-P


Photoelectric Conventional Duct Detector

Availability: Estimated 6 Weeks

  • Factory New
Brand: Air Products & Controls Part #: 9660 Categories: , Manufacturer Part #: SM-501-P 


The SM-501 Series Duct Smoke Detector provides early detection of smoke and products of combustion present in air moving through HVAC ducts in Commercial, Industrial, and Residential applications. The unit is designed to prevent the re-circulation or spread of smoke by air handling systems, fans, and blowers. Complete systems may be shut down in the event of smoke detection.

The SM-501 model will operate on any one of four input voltages (230VAC, 115VAC, 24VAC, or 24VDC). The SM-501 allows up to 30 detectors to be interconnected for many common functions.


Weight 3.4 lbs
Dimensions 9.125 × 7.25 × 2.25 in

Apollo Fire Detectors


Air Products & Controls



Production Status



  • Operating voltages: 230VAC, 115VAC, 24VAC, 24VDC
  • Both models listed for high temperature applications
  • Interconnect up to 30 units for common functions
  • UL, CUL, CSFM, and MEA Listed
  • Compact Size
  • Two sets of 10A form “C” alarm contacts
  • One set of 10A form “C” trouble contacts
  • Rugged steel back box with clear cover
  • Compatible with the WP-1 weatherproof enclosure
  • Easy retro-fit/upgrade of existing RW Series detectors ❖ Clear cover fitted with 4 captive screws
  • Large terminal connection screws
  • Interchangeable “Plug-In” photoelectric or ionization heads
  • Easy mounting without cover removal
  • Advanced detector head design yields internal dust filtering with no additional screens or filters to clean
  • Over 15 remote accessories available

SM-501 Series: Duct Smoke Detectors

Air Products And Controls - Data Sheet

Installation and Maintenance Instructions for SM-501 Series Duct Smoke Detectors

Air Products And Controls - Instructions Installation

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