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also unipolar ionization chamber
Operating Temperature Range: –10°C to 60°C (14°F to 140°F)
• Magnetic test feature
Model OP121 is UL 268
The System Sensor 2251TB is an Intelligent Addressable Photoelectric Smoke Sensor w/ Thermal (135°F / 57
Siemens OP121 Conventional Photoelectric Smoke Detector System Sensor 1451 also unipolar ionization chamberThe microprocessor controlled, self diagnostic circuitry contained in the Siemens photoelectric (conventional) smoke detector, Model OP121, eliminates an installers need of using burdensome sensitivity test equipment. The Model OP121 auto sensitivity feature originates from its internal, self monitoring circuitry, providing dynamic verification of sensitivity and or required maintenance. This detector type is commonly found on the following Siemens
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