Siemens OP921 Photoelectric Smoke Detector

The Siemens OP921 uses state-of-the-art microcontroller circuitry as well as surface-mount technology for maximum reliability. Also, model OP921 incorporates an optical sensor using a light-scattering detection principle. Furthermore, the device utilizes advanced software algorithms to analyze the signals providing highly stable and accurate smoke detection.

Model Siemens OP921 is a wide-spectrum, photoelectric smoke detector that incorporates an infrared light-emitting diode (IRLED), as well as a light-sensing photodiode. Besides, under normal conditions, light transmitted by the LED is directed away from the photodiode and scattered through the smoke chamber in a controlled pattern.

In fact, each detector fits into one (1) wall-or-ceiling footprint, and only occupies one (1) address on the signal-line circuit (SLC). Each device utilizes a dust-resistant photoelectric smoke chamber and microprocessor-based electronics with a low-profile plastic housing. In addition, every Model OP921 fire detector is shipped with a protective dust cover.

Features / Specifications

• Built-in ISOtechnology™
• 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 application sensitivity profiles
• Remote sensitivity measurement capability
• Utilizes advanced, microprocessor-based signal processing
• Extended temperature-and-humidity operating range
• Automatic environment compensation
• Operating Temperature: +32° – +120°F (0° – +49°C)
• Relative Humidity: 0 – 95% (non-condensing)