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SM-501 Series
Product Datapage Data Sheet (pdf) Installation Guide Installation Guide (pdf)

CSFM File CSFM Listing (pdf)

MEA File Vol. 26 (pdf) UL Listing UL UROX-S2829    (pdf)  
UL Listing UL UROX7-S2829

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.

Continuing our history of building innovative and reliable products, the SM-501 is housed in our popular traditional compact housing. The unit provides two sets of 10 Amp form “C” alarm contacts, along with one set of 10 Amp form “C” trouble contacts for monitoring head removal and supply voltage failure. The green pilot and red alarm visual indicators provided on the front of the SM-501 signal the operating status of the device. The green pilot LED will be extinguished when the detector head is removed or power is lost. A manual test/reset switch is located next to the visual indicators. The SM-501 has been specially designed to allow linkage of common detector functions for up to 30 detectors. The units may be wired to use a common test/reset function, and to alarm when a single unit alarms. Also, up to 15 units with signaling devices may be interconnected to operate with a single alarm. The SM-501 is designed and built to meet all local code requirements, as well as the NFPA and ICC standards regarding HVAC supply and return duct smoke detectors. Output terminals are provided for remote accessories such as horns, strobes, remote status indicators, and test/reset key switches or push buttons. The SM-501 is available with either ionization or photoelectric detector heads, which are interchangeable. Air sampling is accomplished via two rear loading tubes which protrude into the duct. An exhaust tube of one standard length (7.0”) is supplied in the installation kit with the duct smoke unit. Once the duct width has been determined, the air intake sampling tube must be ordered. Sampling tubes are supplied in standard lengths (1.0’, 2.5’, 5.0’, and 10.0’), and are cut to size to fit the duct. Mounting the duct smoke detector is accomplished by the use of a template and four sheet metal screws, as provided. Mounting can be achieved without the removal of the clear cover, which is secured by four captive screws.

  • 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


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