System Sensor 2D51 Sensor

The 2D51 photo electronic detector uses a state-of-the-art optical sensing chamber. This detector is designed to provide protection in duct applications when installed with an Innovair Flex 4-wire duct smoke detector housing and to be used with compatible UL listed control panels only. Two LEDs on each detector provide local visible alarm indication. They flash every five seconds indicating that power is applied and the detector is working properly. The LEDs latch on in alarm. LEDs will be off when a trouble condition exists indicating that the detector sensitivity is outside the listed limit. The alarm can be reset by a momentary power interruption test/reset button or remote test accessory with reset function. This detector may be tested by activating the internal reed switch with a magnet test/reset button or remote test accessory.

• Photoelectronic Low-Profile Plug-In Detector for Special Applications. For replacement purposes with 4-wire InnovairFlex duct smoke detectors.
• Note: The 2D51 needs to be used with the D4P120 and B210LP for pendant mount applications.
• The 2D51 can be used as a pendant mount detector in no-flow/low-flow air-handling systems 0-4000 FPM. The pendant /plenum mounted 2D51 is to b.