Mircom MIX-2251BR Intelligent Photoelectric Smoke Detector

The Mircom MIX-2251BR Intelligent Photoelectric Smoke Detector is a low-profile addressable smoke detector designed for compatible Mircom intelligent fire alarm systems. It uses an optical sensing chamber to detect smoke from a broad range of combustion sources.

The MIX-2251BR is the remote-test-capable version of the MIX-2251B. Mircom specifically identifies it for use with DNR and DNRW duct detector housings, allowing remote detector testing in HVAC duct smoke detection applications.

Product Functions

• Provides intelligent addressable smoke detection
• Uses photoelectric optical sensing technology
• Provides remote test capability
• Designed for DNR duct detector housings
• Compatible with DNRW watertight duct housings
• Provides individual detector identification
• Uses rotary addressing
• Continuously communicates detector status
• Supports sensitivity monitoring
• Provides LED status indication
• Low-profile plug-in design
• Supports compatible detector bases
• Suitable for duct air velocities up to 4,000 ft/min

Photoelectric Smoke Detection

The MIX-2251BR uses photoelectric sensing technology to detect airborne smoke particles.

Its optical sensing chamber monitors changes caused by smoke entering the detector. This information is processed and communicated to the compatible Mircom fire alarm control panel for alarm and status evaluation.

Photoelectric detection is particularly effective at detecting visible smoke associated with slow, smoldering fires.

Remote Test Capability

The primary feature distinguishing the MIX-2251BR from the standard MIX-2251B is:

Remote Test Capability

Mircom specifically describes the MIX-2251BR as an intelligent photoelectric detector that is remote-test capable for use with DNR(W) duct detectors.

This allows the detector to be tested remotely when installed inside an HVAC duct detector housing.

DNR / DNRW Compatibility

The MIX-2251BR is compatible with:

DNR — InnovairFlex Duct Detector Housing

DNRW — Watertight InnovairFlex Duct Detector Housing

Mircom’s compatibility documentation specifically lists both housings for use with MIX-2251B and MIX-2251BR detector heads.

Addressable Operation

The MIX-2251BR operates as an individually identifiable device on a compatible Mircom signaling line circuit.

The fire alarm control panel can identify the specific detector reporting an alarm, trouble, or maintenance condition rather than identifying only a conventional detection zone.

Rotary Addressing

The detector uses rotary address switches for device configuration.

This provides straightforward field addressing and simplifies detector identification during commissioning, troubleshooting, and replacement.

Airflow Capability

The photoelectric detector platform supports air velocities from:

0–4,000 ft/min

or approximately:

0–20 m/s

This airflow capability supports the MIX-2251BR’s use in compatible HVAC duct detector housings.

Compatible Detector Bases

Compatible bases within the MIX-200 Series include:

B501 — Flangeless Mounting Base

B210LP — Flanged Mounting Base

B224RB — Relay Base

B224BI — Isolator Base

B200SR — Sounder Base.

Electrical & Detection Information

Model: MIX-2251BR

Device Type: Intelligent Photoelectric Smoke Detector

Sensing Technology: Photoelectric / Optical

Operating Voltage: 15–32 VDC

Standby Current: 300 µA at 24 VDC

Maximum LED Current: 6.5 mA at 24 VDC

Air Velocity: 0–4,000 ft/min

Relative Humidity: 10–93%, non-condensing

Remote Test: Yes

Duct Compatibility: DNR / DNRW

Detector Base: Separately ordered.

MIX-2251BR Datasheet