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ATEX explosion-proof level sensor battery powered level gauge sewage level monitor remote level measurement cloud level platform liquid level transmitter continuous level measurement 4-20mA level transmitter RoHS bulk smoke detector test kit security system testing Immersion Flood Alarm RoHS compliant smart home security fire safety exporter fire detection case smart fire platform smart municipality fire safety partner wireless fire detect senior home safety aging in place f Farm Security System flood detection system basement water sensor China alarm manufacturer smoke test equipment brochure French smoke detector tester demand wireless smoke detector test kit fire alarm test tool IoT stove monitor Application Scenarios solution TV stick Personal Alarm for Elderly fire safety case study ULC listed fire safety deployment case fire detection technolog Smart Features solution smart TV stick video conferencing Zoom wireless fire detection residential village fire alarm system fi UKCA 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