Data Sheet for Product

ManualsBrandsSiemens ManualsFire - Detectors & PeripheralsFDOOT441 Multi-Criteria Fire Detector [with ASAtechnology], Data Sheet

Siemens Data Sheet 9900

Smart Infrastructure – Building Products usa.siemens.com/fire

Product Overview

The

Photoelectric | Thermal (Heat) Detector (Model OH921) is an intelligent,

addressable multi

-criteria detector that incorporates optical and thermal sensors,

and uses signals in a neural network to create an

intelligent multi-criteria detector.

The encompassing result is a detector that provides enhanced detection to a wide

range of products of combustion.

Model OH921 is UL 268 7th Ed. listed and incorporates

advanced built-in

ISO

technology™ - True Class-X SLC operation (use is optional) greatly improves

reliability, circuit integrity and provides advanced addressable fault finding.

The multi

-criteria detector also has state-of-the-art microprocessor circuitry (with

error check), as well as detector self

-diagnostics and supervision programs that is

used on Cerberus PRO Modular

| FireFinder XLS/V and on Model FC/FV9-series

Cerberus PRO

fire-alarm control panels (FACPs).

Additionally, Model OH921 is a plug

-in and addressable two-wire multi-criteria

detector (with both photoelectric and thermal sensors)

whose value is

increased with built

-in ISOtechnology feature, that is compatible with all

current

Siemens intelligent, addressable systems.

Operation

Model OH921 utilizes an infrared light emitting diode (IRLED),and infrared light

sensing photodiode. Under normal conditions, light transmitted by the LED is

directed away from the

photodiode and scattered through the smoke chamber in a

controlled pattern.

The smoke chamber is designed to manage light dissipation and extraneous

reflections from dust particles or other non

-smoke, airborne contaminants in such a

way as to maintain stab

le, consistent detector operation. When smoke enters the

detector chamber, light emitted from the IRLED is scattered by the smoke particles,

and is received by the photodiode.

Model OH921 also utilizes a modern, accurate and shock

-resistant thermistor to

sense temperature changes.

The signal processing with detection algorithms

allows the detector to first gather smoke and thermal

data, and then analyze this information in the

detector’s `neural network.’

By comparing data

received with the common chara

cteristics of fires or

fire signatures, Model OH921 can compare these

signals to those of deceptive phenomena that cause

other detectors to trigger a false alarm.

Each Model OH921 detector provides three (3) pre

-programmed parameter sets

that can be sele

cted by the FACP.

Cerberus® PRO

Detectors and Peripherals

Multi-Criteria Fire Detector

Model OH921

Multi-Criteria Fire Detector

Architect & Engineer Specifications

 UL 268 7th Edition Listed

 Built-in ISOtechnology™

 252 Isolation devices per SLC

 Each detector is self-testing:

- complete diagnostics performed every 10

seconds

- self-monitored for sensitivity within UL

Listed limits

 Listed, approved as a heat detector:

- Rate-of-Rise Detection: 15

F / min. (8.3

/ min.)

- Fixed: 135

F (57

 Superior electromagnetic interference (EMI)

and radio-frequency interference (RFI)

immunity

 Field programmable as rate-of-rise or fixed

temperature, per `Alarm Source 2’ | Standard

parameter

 Tri-color detector-status light-emitting diode

(LED) with 360° view

 Compatible with Model 8720 | DPU (device

programmer / loop tester)

 Polarity insensitive via SureWire™

technology (in non-isolator mode)

 Functions with Model DB-11–series mounting

bases

 Restriction of Hazardous Substances (RoHS

compliant)

 Automatic environment compensation

 UL Listed | FM, CSFM Approved

- UL 268: `Open Area Smoke Detection’

- UL 268A (Duct) - `Direct-in-Duct’ use

- UL 521: `Open Area Heat Detection’

- ULC-S529: `System Smoke Detector’

- ULC-S530: ‘Heat Actuated Fire Detection’

- FM 3230: `Open Area Smoke Detection’

- FM 3210: `Open Area Heat Detection’

- CSFM | File: 7272-0067:0258

Model OH921

Multi-Criteria Fire Detector

Summary of content (5 pages)

PAGE 1
Cerberus® PRO Detectors and Peripherals Multi-Criteria Fire Detector Model OH921 Architect & Engineer Specifications  UL 268 7th Edition Listed  Built-in ISOtechnology™ 252 Isolation devices per SLC    Each detector is self-testing: - complete diagnostics performed every 10 seconds - self-monitored for sensitivity within UL Listed limits Listed, approved as a heat detector: - Rate-of-Rise Detection: 15°F / min. (8.3°C / min.
PAGE 2
1 1. Dust cover 1. Labyrinth 2. Multi-criteria detector 2. Optical transmitter NOTE: Each detector consists of a dust-resistant photoelectric chamber; a solid state, non-mechanical thermal sensor, and microprocessor-based electronics with a low-profile plastic housing. Every Model OH921 fire detector is shipped with a protective dust cover. 3. Optical receiver 4.
PAGE 3
Installation All Model OH921 detectors use a surface-mounting base, Model DB-11 or Model DB-11E, which mounts on a 4-inch (10.2 cm.) octagonal, square or single-gang electrical box. The base utilizes screw-clamp contacts for electrical connections and self-wiping contacts for increased reliability.
PAGE 4
Field-Device Programmer / Test Unit Model OH921 is compatible with the Siemens field-device programmer / test unit (Model 8720 | DPU), which is a compact, portable and menu-driven accessory for electronically programming and testing these addressable detectors promptly and reliably. For instance, the field technician selects the accessory’s program mode, and enters the desired address. Model DPU eliminates the need for cumbersome, unreliable mechanical programming methods (e.g.
PAGE 5
NOTICE – The information contained in this data-sheet document is intended only as a summary, and is subject to change without notice. The product(s) described here has/have a specific instruction sheet(s) that cover various technical, limitation and liability information. Copies of install-type, instruction sheets – as well as the General Product Warning and Limitations document, which also contains important data, are provided with the product, and are available from the Manufacturer.