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tank level gauge multi-point level detection level alarm system radar level gauge OEM level transmitter RS485 Modbus level gauge ATEX explosion-proof level sensor battery powered level gauge cloud level platform liquid level transmitter 4-20mA level transmitter RoHS IoT level monitoring flood prevention level sensor magnetic flap level gauge well water level sensor IP68 waterproof level sensor dry run protection level switch low power level sensor RTU level acquisition ISO9001 level gauge factory