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tester bulk order alarm threshold validation smoke aerosol shelf life 3 years VDS smoke alarm stove voice warning rainwater harvesting level sensor SIL2 certified level measurement factory direct level gauge wastewater level sensor RoHS compliant level transmitter digital level display remote level measurement RS485 Modbus level gauge ATEX explosion-proof level sensor magnetic flap level gauge battery powered level gauge flood prevention level sensor dry run protection level switch high temperature level gauge tank overflow prevention cooling tower level monitor boiler level gauge well wate flood prevention level sensor HART protocol level sensor low power level sensor LoRa level sensor level auto control IoT level monitoring radar level gauge DTU level transmission SCADA level system CE certified level sensor explosion-proof level transmitter level alarm system solar powered level transmitter water level monitoring float level s NB-IoT level meter well water level sensor wireless 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