Do intrinsically safe instruments necessarily need to be used with a safety barrier?
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Intrinsic safety instruments are suitable for all hazardous locations and all explosive gas and vapor mixtures, and can be serviced and adjusted while powered on. However, it cannot be used alone; it must form an intrinsically safe circuit together with intrinsically safe associated devices (safety barriers) and external wiring in order to exert its explosion-proof function. Now I have a question: I’ve seen a portable combustible gas alarm that emits audible and visual alerts when the concentration of combustible gases exceeds the safe level. But he doesn’t need a safety barrier. Is this intrinsically safe device explosion-proof?
There is another issue: the so-called safety barrier is an intrinsically safe associated device, right? Does that mean every intrinsically safe associated device is a safety barrier? Are there any other intrinsically safe associated devices? For example, the “intrinsically safe power supply” I’ve heard of – don’t the portable devices using it need to be connected to other devices?
Portable combustible gas detectors do not have signal transmission; in other words, there are no cables connecting them to electrical equipment. A safety barrier is used to isolate field signals, enabling the safe use of field devices.
Intrinsic safety instruments require a safety barrier, while flameproof instruments do not.
\"Intrinsic safety\" is a term that refers to the property where, in the event of a failure in any component or circuit, the energy generated as a result is not sufficient to cause an explosion. It is therefore merely an adjective. The use of a safety barrier with intrinsic safety instruments is done for safety reasons only; it is not a mandatory requirement. Only instruments with explosion protection need safety barriers, as these barriers can limit the level of energy in case of an explosion occurring on site. Therefore, intrinsically safe instruments can be understood as instruments that come equipped with a safety barrier, ensuring that no explosion will occur even in case of arcing.
“Intrinsic safety is a type of explosion protection; an intrinsic safety circuit consists of intrinsic safety equipment located in hazardous areas, associated equipment in safe areas (safety barriers), and the cables connecting the two. Safety barriers are essential, and intrinsic safety instruments can be opened for maintenance while still powered on. Explosion-proof devices do not require a safety barrier, but it is stipulated that they must not be opened for maintenance while powered on.
Portable combustible gas detectors are flameproof, right? No signal transmission was carried out. . . :)
Of course, because only by forming an intrinsically safe system can the intrinsically safe effect be achieved
For portable instruments, where should the safety barrier be installed? If it is necessary to meet the intrinsically safe requirements, when going to the site, in addition to bringing the portable instrument, one can also carry a safety barrier in their pocket; in case of an inspection, they can show it to prove that the safety barrier is in place.
What the original poster means is, what to do if a portable alarm device malfunctions!