A system for data transmission for an explosive environment comprises an ultrasonic transmitter coupled to a Class 1 device disposed inside an explosive risk zone and adapted to generate an electric signal in response to a predetermined condition, the ultrasonic transmitter being configured to generate and transmit an ultrasonic signal in response to receiving the electric signal, an ultrasonic receiver disposed outside the explosive risk zone configured to receive the ultrasonic signal, and an uplink communication device adapted to communicate an alert to a remote operator in response to the ultrasonic receiver receiving the ultrasonic signal.