... threshold or blocked sent out the acousto-optic alarm, timely remind workers pay attention to safety. Instrument ... light ALARM 5s, have "ALARM" display. Dose rate p 25 muon Sv/h, sound-light ALARM about 6s, ALARM "display". Jam ALARM when ... counting tube counting blocked, continuous ALARM kept, "ALARM" display. Alarm sound intensity: 30cm ...