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a. BATTERY ALARM - If battery voltage is low, the BATTERY segment flashes on the display. Ten operation hours are remaining. b. DETECTOR ALARM - In case of defective or disconnected detector, the DETECTOR segment flashes on the display. c. OVERFLOW - In case of detector overflow, the OFLO LCDs is displayed (instead of digits). d. THRESHOLD ALARM - When reading exceeds threshold value the ALARM segment flashes on the display. RAM DA-2000/ Operating & Maintenance Manual Page 19