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case study gl Kitchen Unoccupied Stove Alarm kitchen presence detector Zigbee kitchen gateway kitchen emergency button independent living safety AI kitchen safety gateway kitchen app notification kitchen unattended alarm senior stove monitor kitchen safety solution kitchen humidity sensor PIR kitchen sen digital pressure gauge OEM pressure transmitter NB-IoT pressure sensor China pressure gauge manufacturer water supply pressure sensor gas pressure monitoring IP68 pressure s fire safety R&D automotive plant fire safety solution fire detection Wanlin Fire Control water level monitoring hydrostatic level gauge RoHS compliant level transmitter liquid level transmitter NB-IoT level meter explosion-proof level transmitter LoRa level sensor battery powered level gauge level alarm system well water level sensor RTU level acquisition IoT level monitoring continuous level measurement cooling tower level monitor tank overflow prevention solar powered level transmitter DTU level transmission CE 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