System Sensor 2D51 Low-Profile Photoelectric Plug-In Sensor, InnovairFlex Duct

System Sensor 2D51 Photoelectronic Low-Profile Plug-In Detector

System Sensor 2D51 is a low-profile photoelectric plug-in smoke sensor head for InnovairFlex duct detector housings.

The 2D51 is the sensing head alone, not a complete duct detector. It twists into the base inside a System Sensor InnovairFlex 4-wire duct housing and reads air drawn off the duct through the sampling tubes, so fans and dampers can be shut down when smoke enters the air-handling system. It can also be pendant mounted on a B210LP or B501 base wired to a D4P120 power board.

Features

• Photoelectric optical sensing chamber, not ionization
• Rated for air velocities up to 4,000 ft per minute
• UL 268A certified for air-handling systems when used with the B210LP base
• Two LEDs blink every five seconds in standby and latch on in alarm

Specifications Model 2D51 Type Low-profile photoelectric plug-in sensor head Height 2.0 in Diameter 4.1 in Weight 3.1 oz Operating temperature –4°F to 158°F (–20°C to 70°C) Air velocity Up to 4,000 ft/min Compatibility

The 2D51 is a replacement or spare sensing head for System Sensor InnovairFlex 4-wire duct housings. For a complete duct detector rather than a replacement head, order the InnovairFlex D4120 or D4120W (see the System Sensor D4120W 4-wire duct smoke detector).

For pendant mounting, the 2D51 needs the B210LP or B501 base plus the D4P120 power board, to which the RA100Z annunciator and RTS151 test station connect.

Questions

Is the 2D51 a complete duct detector? No. It is the sensing head only and needs an InnovairFlex housing or a pendant-mount base with a D4P120 power board.

Is it photoelectric or ionization? Photoelectric.

Brand new in original packaging. Ships same business day from Atlanta, GA when ordered by 3 PM ET. 30-day returns. 1-year warranty.