Description The HD203B Addressable Photoelectric Smoke & Heat Detector is an intelligent, plug-in type fire detection device designed for reliable performance in addressable fire alarm systems. It combines advanced photoelectric smoke sensing with heat detection to provide accurate and early fire detection while minimizing false alarms. This detector uses addressable analog communication, transmitting real-time analog signals that represent smoke density or temperature to the fire alarm control panel. Each detector’s unique address is securely stored in the MCU’s EEPROM and can be easily configured using a portable address-setting device. The HD203B is equipped with dual LED indicators, controlled by the fire alarm panel, to clearly display device status including normal operation, fault, and alarm conditions. Designed for dependable operation across a wide range of environmental conditions, the detector requires compatible addressable communication protocols and must be connected only to listed, compatible fire alarm control panels. The HD203B is suitable for commercial, industrial, and residential applications where reliable smoke and heat detection is required. Specifications Detector Type: Addressable Photoelectric Smoke & Heat Detector Model: HD203B Sensing Method: Photoelectric smoke sensing with heat detection Operating Voltage Range: 15 – 28 VDC Standby Current: 400 µA @ 24 VDC (One communication every 5 seconds with LED blink enabled) Maximum Alarm Current: 7 mA @ 24 VDC (LED ON) Communication Type: Addressable analog communication Addressing Method: EEPROM-stored, programmable via portable address setting device LED Indicators: Dual LEDs, panel-controlled Operating Temperature Range: 14°F to 122°F (-10°C to +50°C) Operating Humidity Range: 10% to 95% RH (Non-condensing)