I am trying to get some traction with finding rules and regulations when it comes to intrinsically safe barriers. I have 2 types of sensors: Thermocouples and a 0-5V signal. I know thermocouples themselves do not have to be rated intrinsically safe, but does the 0-5V sensor have to be rated intrinsically safe? The power supply for the 0-5V sensor consumes >50mA, but I believe this is still high to use with an intrinsic barrier.
Does my 0-5V sensor have to be rated as intrinsically safe before I can use it with an ISB? Or does the ISB make the sensor intrinsically safe?
Does my 0-5V sensor have to be rated as intrinsically safe before I can use it with an ISB? Or does the ISB make the sensor intrinsically safe?