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Supports compatible two-wire smoke detectors
the panel CPU stops the group poll and concentrates on single points
— BH501BHA Sounder base
pull stations
Siemens OP121 Conventional Photoelectric Smoke Detector M500SF Supports compatible two-wire smoke detectorsThe 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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