Siemens OP921 Addressable Photoelectric Smoke Detector c/w.Base

Product Overview
The Photoelectric Smoke Detector (Model OP921) uses state-of-the-art microcontroller
circuitry and surface-mount technology for maximum reliability. Model OP921
incorporates an optical sensor using a light-scattering detection principle. The device
utilizes advanced software algorithms to analyze the signals, and provides highly stable
and accurate smoke detection.
Model OP921 also uses state-of-the-art microprocessor circuitry with error check;
detector self-diagnostics, and supervision programs.
Each detector fits into one (1) wall-or-ceiling footprint, and only occupies one (1)
address on the signal-line circuit (SLC)
Model OP921 is a plug-in, two-wire and addressable photoelectric smoke detector.
Model OH921 is Underwriters’ Laboratories Listed [UL268A Listed for direct in-air
duct usage].
Each detector consists of a dust-resistant photoelectric chamber and microprocessorbased electronics with a low-profile plastic housing. Every Model OP921 fire detector
is shipped with a protective dust cover.

Architect & Engineer Specifications
 Compatible with Siemens Model
`H’-series devices on the same
loop (with Cerberus PRO Modular
| FireFinder XLS | FC/FV9–series
fire-alarm control panels
 Compatible with Model 8720 | DPU
(device programmer / loop tester)
 Each detector is self-testing:
- self monitored for sensitivity
with UL Listed limits
- complete diagnostics performed
every 10 seconds
 Polarity insensitive via
SureWire technology
 Functions with Model DB-11–series
mounting bases
 Tri-color detector-status light-emitting
diode (LED) with 360 ° view
 Field-selectable applicationsensitivity profiles
 Remote sensitivitymeasurement capability
 Utilizes advanced, microprocessorbased signal processing
 Extended temperature-and-humidity
operating range
 Automatic environment compensation
 Superior electromagnetic interference
(EMI) and radio-frequency interference
(RFI) immunity