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radar level gauge China level sensor manufacture Conventional 4 wire smoke heat detector industrial smoke detect wireless pressure gauge IP68 pressure sensor battery-powered pressure gauge replacement heat capsule heat detector tester EXW factory North America distributor fire safety case study fire alarm cloud connectivity solution fire alarm syst rainwater harvesting level sensor SIL2 certified level measurement export level measurement sewage level monitor chemical tank level sensor ATEX explosion-proof level sensor flood prevention level sensor level home health monitoring wholesale IoT elder care elderly remote monitoring automatic stove shut off aging population safety medical alert system for seniors aging in place sup adjustable reach length test capsule replacement Middle East distributor EN54 certified surgical center fire detection deployment var Water Shut Off Valve Controller CE certified smoke alarm WiFi smoke detector smoke detector test station portable smoke tester 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