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FCO-951A Fire/CO Detector
(Replaces FCO-851A) Advanced Multi-Criteria Fire/CO Detector Addressable

The IntelliQuad® PLUS FCO-951/-IV and FCO-951A/-IV advanced
multi-criteria fire/CO detector is a plug-in, addressable device that
provides both fire and carbon monoxide (CO) detection. The detector
combines four separate sensing elements in one unit to sense
multiple components of a fire: smoke, CO, light/flame, and heat. This
approach enables enhanced sensitivity to real fire with heightened
immunity to nuisance particulates. For CO, the detector’s electrochemical
sensing cell creates a separate signal for life safety CO

Multiple sensors and communication can greatly reduce nuisance
alarms compared to single sensing methods. Sophisticated algorithms
maximize the advantages of the sensor types creating our
best detection strategy offering heightened immunity to nuisance
particulate and enhanced sensitivity to real fire.• Photoelectric sensors detect airborne particles associated with

• Thermal sensors detect heat and rate-of-rise (135°F fixed temperature
• Carbon Monoxide sensors detect this by-product of fire for accurate
fire detection.
• Infrared sensors discern light patterns in the environment as an
additional data point for alarm determination.
This ability to reject certain nuisance alarm triggers, such as theater
smoke, supports the use of the IntelliQuad PLUS Series detector in
applications where moderate to heavy nuisance conditions exist that
might cause single sensing detectors to false alarm.
The IntelliQuad PLUS Series detector meets both UL 268 7th edition
and UL 521 listing requirements for fire detection as well as the UL
2075 standard for system-connected life safety carbon monoxide
detection. Canadian models meet listing requirements of CAN/ULC
S529, CAN/ULC S530 and CSA 6.19-01.

Released through the incomplete burning of various fuels, CO is a
colorless, odorless and deadly gas that is virtually impossible to
detect with the human senses. Because the potential exists for dangerous
levels of CO to accumulate in almost any building, legislation
mandating the use of CO detection in commercial spaces continues
to grow.

B200S series intelligent sounder bases (B200SCOA series in Canada)
are recommended for use with FCO-951 Series IntelliQuad
PLUS. These bases can generate either a Temp 3 pattern for fire or
a Temp 4 pattern for CO alarm indication. The B200S/B200SCOA
series bases recognize the System Sensor synchronization protocol,
for use as a component of the general evacuation signal —
along with other System Sensor horns, horn strobes, and chimes —
when connected to a power supply or Fire Alarm Control Panel
(FACP) output capable of generating the System Sensor synchronization

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