Bosch (D7050) Photoelectric Smoke Detector Head

The Bosch D7050 is an addressable photoelectric smoke detector head. It connects to the multiplex bus of compatible Bosch fire alarm control panels. Specifically, it uses light-scattering technology to spot the large smoke particles produced by smoldering fires.

A pulsed infrared source and high-speed photodiode sit inside the optical chamber. As a result, the detector responds quickly to smoke yet rejects external light interference. In addition, the chamber’s symmetry allows 360° smoke entry from any direction.

How the Bosch D7050 Detects Smoke

First, smoke particles enter the optical chamber through screened openings. Then, the infrared beam scatters off those particles toward the photodiode. As a result, the detector head signals the panel over its two-wire multiplex bus connection.

The D7050 also runs Bosch’s Chamber Check self-diagnostic continuously. Specifically, if calibration drifts out of range, the LED double-flashes every 3 to 8 seconds. Furthermore, the head sends a dirty-chamber report to the FACP. As a result, maintenance crews know exactly when service is due.

Field-Replaceable Head Design

The D7050 is a detector head only. It mounts on the D7050-B6 two-wire base, which holds all the wiring. To install, align the head with the base and twist clockwise. No tools are required, except the hex key for the tamper screw.

This split design simplifies maintenance. When a head needs replacement, the base and field wiring stay in place. Therefore, swaps take minutes rather than hours on large systems.

Key Features

• Photoelectric (light-scattering) smoke detection — pulsed infrared source with gated photodiode
• 360° symmetric optical chamber for uniform smoke entry
• Chamber Check self-diagnostics — automatic sensitivity reporting
• Magnetic test feature using the SMK-TM test magnet
• Field-replaceable head — base and wiring remain in place during service
• LED flashes every 3–8 seconds in normal operation; once per second or faster in alarm
• Superior dust immunity through the gated infrared design
• UL 268 (UROX) and CAN/ULC-S529 (UROX7) listed; FM, CSFM, and FDNY approved

Specifications

• Sensing technology: Photoelectric — pulsed infrared, gated photodiode
• Operating voltage: 8 VDC peak (minimum) from the multiplex bus
• Standby current: 0.55 mA nominal
• Alarm current: 0.55 mA maximum
• Power-up time: 22 seconds maximum
• Operating temperature: 32°F to 100°F (0°C to 38°C)
• RFI immunity: No false alarm at 26 MHz–950 MHz, field strengths under 50 V/m
• Dimensions: 4″ diameter × 1.3″ depth (10.2 cm × 3.3 cm)
• Material: High-impact, fire-retardant ABS plastic, off-white
• Required base: Bosch D7050-B6 (sold separately)

Compatible Panels

The Bosch D7050 works with the following Bosch FACPs over their multiplex bus:

• Bosch FPD-7024 Addressable FACP
• Bosch D7024 and D7024-EXP Addressable FACPs
• Bosch DS7400Xi Control Panel
• G Series — D9412G, D7412G, and D7212G1 (with the D8125MUX interface module; note: D7212G is not UL Listed for commercial fire)

Order the Bosch D7050

Life Safety Consultants stocks the Bosch D7050 along with the matching D7050-B6 base and the DT-2 detector removal tool. To order or confirm compatibility for your panel, call 1-888-557-0558. Alternatively, email sales@lifesafetycom.com.

For more information, contact the Life Safety Consultants team at (888) 557-0558, or email us at: sales@lifesafetycom.com