9 Electronic safety devices and apparatus to be used in environments with explosion hazard, namely, current-voltage-temperature transmitters, isolating electronic converters, interfaces for magnetic pickups, interfaces for proximity electronic switches, interfaces for vibration electronic sensors, interfaces for electronic load cells, interfaces for electronic strain gauges, interfaces for electrovalves in the nature of electric valve actuators, interfaces for serial communication protocols, interfaces for LEDs, resistance temperature detector and thermocouple temperature sensors, intrinsic safety multiplexers for analog and digital inputs, power supplies with and without hot swapping, remote input output electronic modules, digital loop level indicators, electric safety relays, surge protectors; Apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity, namely, current-voltage-temperature transmitters, isolating electronic converters, interfaces for magnetic pickups, interfaces for proximity electronic switches, interfaces for vibration electronic sensors, interfaces for electronic load cells, interfaces for electronic strain gauges, interfaces for electrovalves in the nature of electric valve actuators, interfaces for serial communication protocols, interfaces for LEDs, resistance temperature detector and thermocouple temperature sensors, intrinsic safety multiplexers for analog and digital inputs, power supplies with and without hot swapping, remote input output electronic modules, digital loop level indicators, electric safety relays, surge protectors