The Notifier FSP-951 smoke detector is one of the most widely requested replacements for Notifier addressable fire alarm systems. Whether you are upgrading from the FSP-851 or replacing a failed unit in an existing Notifier installation, this guide covers everything you need to know: specifications, base compatibility, panel compatibility, and ordering considerations.
FSP-951 Overview and Key Specifications
The FSP-951 is a photoelectric intelligent smoke detector designed for use on Notifier’s FlashScan and CLIP addressable loops. It represents a newer generation than the FSP-851, with improved sensitivity algorithms and updated aesthetics. Key specifications include:
- Detection method: Photoelectric (light-scattering principle)
- Operating voltage: 15–32V DC (loop powered)
- Standby current: Approximately 300 microamps
- Alarm current: 6.5 mA average
- Operating temperature: 32°F to 100°F (0°C to 38°C)
- Humidity range: 10%–93% relative humidity, non-condensing
- Protocol compatibility: FlashScan and CLIP
The FSP-951 features Notifier’s signature low-profile design and a tri-color LED indicator (red for alarm, yellow for trouble/drift, green for normal operation in certain configurations).
FSP-951 vs FSP-851: What Changed?
The Notifier FSP-851 was the previous generation of Notifier intelligent photoelectric detectors and remains in widespread use. Here are the key differences between the two models:
- Sensitivity range: The FSP-951 offers a slightly wider sensitivity adjustment range, allowing for better tuning in challenging environments.
- Aesthetics: The FSP-951 has an updated, slimmer profile that blends better in modern commercial spaces.
- Drift compensation: Both detectors include automatic drift compensation, but the FSP-951’s algorithms are more refined.
- Base compatibility: Both models are compatible with the same Notifier detector bases, including the B710LP and B210LP — making direct field replacement straightforward.
In most cases, the FSP-951 is a direct drop-in replacement for FSP-851 installations. Always verify loop loading and panel software revision before swapping detectors on a large addressable system.
Compatible Detector Bases
The FSP-951 is compatible with several Notifier detector bases. The two most common in the field are:
- B710LP: The standard low-profile base for Notifier intelligent detectors. Compatible with FSP-851, FSP-951, and other Notifier detector heads.
- B210LP: A low-profile base with an additional sounder/isolator option, used in systems requiring base-level sounders or short-circuit isolation on the SLC loop.
If you are replacing a detector in an existing installation, the base typically does not need to be replaced — simply remove the old detector head and install the FSP-951 on the existing base. Confirm the base model is compatible before proceeding.
Panel Compatibility
The FSP-951 is compatible with the full range of Notifier FlashScan addressable panels, including:
- NFS2-3030: Notifier’s flagship large-capacity panel, supporting up to 3,030 addressable devices. The FSP-951 is fully compatible in both FlashScan and CLIP modes.
- NFS-320: A mid-range single-loop panel commonly installed in smaller commercial buildings. FSP-951 compatibility requires NFS-320 firmware version 3.0 or later — verify before ordering.
- NFS2-640 / AFP-200 series: Earlier generation Notifier panels also support the FSP-951 in CLIP mode.
For legacy Notifier panels running older firmware, CLIP mode is the safest compatibility path. FlashScan mode unlocks additional features like drift compensation reporting and detailed status information at the panel.
Where to Order the FSP-951
The Notifier FSP-951 smoke detector is available from Life Safety Consultants. We stock both the FSP-951 and FSP-851 along with compatible bases and accessories for Notifier addressable systems. Browse our complete Notifier parts catalog for detectors, modules, pull stations, and more.
When ordering, specify the quantity and whether you need bases. If you are doing a large-scale replacement project, contact us for volume pricing.
Summary
The Notifier FSP-951 is a capable, current-generation photoelectric smoke detector that directly replaces the FSP-851 in most applications. It is compatible with FlashScan and CLIP panels including the NFS2-3030 and NFS-320, and works with existing B710LP and B210LP bases. For replacement projects large or small, Life Safety Consultants is your source for genuine Notifier parts.
