Main performance and features:  

① Bus signal transmission (+24V, GND, S+, S-) (SD8003)  

② 4-20mA split signal transmission (+24V, GND, SI) (SD8003F)  

③ LCD display  

④ Resistant to RF/EMI interference  

⑤ Two-level alarms: low-limit alarm and high-limit alarm  

⑥ Automatic fault monitoring  

When any of the following conditions occur, the controller emits a distinct sound and light fault signal:  

When there is a short circuit or disconnection fault in the connection line between the controller and the detector;  

When there is a detector fault;  

When there is a main power supply or backup power supply fault.  

⑦ Linked output with configurable linkage output methods and logic  

Three-way linkage output can control three external devices (fans or solenoid valves).  

⑧ Power conversion function  

Main and backup power supply with seamless switching and indicators for the working status of each power supply.  

⑨ Ability to save 999 alarm records and 999 fault records separately  

Query the last 999 alarm and fault records, with information retained even in power failure.  

⑩ Battery protection function  

When only the backup power is working and the battery voltage is low, the system automatically shuts down to protect the battery.  

⑪ RS485 bus interface for communication with the host computer.