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level gauge dry run protection level switch IP68 waterproof level sensor deep well level gauge solar powered level transmitter DTU level transmission river water level monitoring boiler level gauge export level measurement AS 1670 smoke detector test Australia South African smoke tester SABS East Asia distributor shower pull cord alarm flood prevention system elderly care devices medical alert system for seniors senior safety OEM elderly heat test for linear heat detector smoke test for furniture warehouse SIL2 certified level measurement 4G level sensor wastewater level sensor China level sensor manufacturer submersible level transmitter industrial level control wir door sensor alarm senior safety export bed exit alarm IoT elder care bedside emergency button photoelectric smoke detector aging population safety aged care supplier wholesale water leak detectors smoke test for rack storage smoke test for ceiling void ba CE approved fire safety automotive plant fire safety solution f low 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