Mircom MIX-2251B Intelligent Photoelectric Smoke Detector

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

The MIX-2251B provides intelligent communications, individual point identification, sensitivity monitoring, rotary addressing, and dual LED indication. It is a plug-in detector that requires a compatible MIX-200 Series detector base.

Product Functions

• Provides intelligent addressable smoke detection
• Uses photoelectric optical sensing
• Low-profile detector design
• Provides individual Point ID identification
• Uses rotary decade addressing
• Provides continuous sensitivity monitoring
• Supports programmable detector sensitivity
• Provides dual LED status indication
• Supports magnetic testing
• Provides low standby current
• Supports compatible relay and isolator bases
• Supports compatible sounder bases
• Suitable for open-area applications
• Suitable for applicable duct applications

Photoelectric Smoke Detection

The MIX-2251B uses a specialized optical sensing chamber designed to detect smoke produced by a wide variety of combustion sources.

Photoelectric technology provides effective detection of visible smoke particles, including those commonly associated with slow, smoldering fires.

Intelligent Addressable Operation

The detector incorporates an integral communications module that continuously communicates its condition to the compatible Mircom fire alarm control panel.

Individual Point ID capability allows the system to identify the exact detector reporting an alarm or maintenance condition.

Rotary Addressing

The MIX-2251B uses rotary decade address switches.

The detector address is selected directly at the device, providing straightforward identification during commissioning, servicing, and replacement.

Sensitivity Monitoring

Detector sensitivity is continuously monitored and reported to the compatible fire alarm control panel.

The control system can identify when contamination within the sensing chamber reaches an unacceptable level, helping maintenance personnel identify detectors requiring cleaning or service.

LED Status Indication

The MIX-2251B incorporates dual status LEDs.

The LEDs provide local indication of detector communication and alarm conditions, allowing technicians to quickly verify detector operation during system testing and troubleshooting.

Compatible Detector Bases

Compatible bases include:

B501 — Intelligent Flangeless Mounting Base

B210LP — Intelligent Flanged Mounting Base

B224RB — Intelligent Relay Base

B224BI — Intelligent Isolator Base

B200SR — Intelligent Sounder Base.

Electrical & Detection Information

Model: MIX-2251B

Device Type: Intelligent Photoelectric Smoke Detector

Sensing Technology: Photoelectric / Optical

Operating Voltage: 15–32 VDC

Maximum Standby Current: 360 µA at 24 VDC

Maximum LED Current: 6.5 mA at 24 VDC

Air Velocity: 0–4,000 ft/min

Operating Temperature: 32°F to 120°F / 0°C to 49°C

Relative Humidity: 10–93%, non-condensing

Addressing: Rotary Decade Switches

Base: Separately ordered.

Product Status

The MIX-2251B is a legacy CLIP-protocol detector. Mircom states that it is limited to PRO-2000 and marine applications and recommends the MIX-2251AP for other projects.

MIX-2251B Datasheet