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level switch China level sensor manufacturer water tank l third-party lab test report for Latin America EN54 smoke test device global export solution commercial fire safety hospital ward fire detection deployment variant 42 China f custom fire alarm tester stove detection sensor nursing home kitchen a water pressure monitoring Boiler Steam Wireless Pressure Gauge smart Addressable combined smoke heat detector industrial smoke detec smart home fire detection deployment variant 14 fire detection cas kitchen unattended detector demen