Can an explosion-proof valve positioner replace an intrinsically safe one?

It depends on the application scenario: 1. If it is in Zone 0, flameproof types cannot be used. 2. If not in Zone 0, flameproof types can be used; a safety barrier cannot be added. It’s not a simple replacement.

Why can’t a safety barrier be added? Reason?

It depends on which area it is; personally, I think it’s still necessary to communicate with the customer

Strictly speaking, it’s absolutely not allowed! Explosion protection and intrinsically safe are two different concepts, and many people often confuse them or compare them. By \"flameproof type,\" it generally refers to the enclosure – for example, the enclosure of a locator. In chemical hazard areas, electrical signals and sparks can occur in the wiring circuits, which may lead to explosions; at such times, the flameproof enclosure of the locator plays a crucial role by providing isolation. In contrast, intrinsically safe refers to an intrinsically safe circuit, fundamentally speaking. I recommend communicating with the client personally; they are well-versed in the chemical industry. If it’s an emergency, they can act as a temporary replacement based on the on-site requirements, and then switch to the regular product once it’s available in stock.

I think it’s fine; using intrinsically safe cables for the wiring and connecting them to the safety barrier will work. Comments and criticism are welcome.

Intrinsic safety devices have higher requirements and cannot be replaced

This cannot be replaced; the explosion protection principles for intrinsically safe instruments and flameproof instruments are different. The Ex d explosion protection technology involves enclosing electrical components within a housing; the high-temperature, high-pressure gases generated by a spark that could cause an explosion are allowed to escape through gaps in the housing (explosion protection gaps), where they are cooled and depressurized. The gases that emerge after this process no longer have enough energy to cause an explosion outside the housing. Therefore, explosion protection means containing the energy of an explosion inside the enclosure, rather than preventing explosive gases from reaching the outside of the enclosure – sealing is what actually prevents external explosive gases from entering. The E*a/ib intrinsically safe technology is generally used in instruments; it works by limiting the energy in electrical circuits and, combined with the structural design of the electrical equipment, ensures that no conditions arise under normal or abnormal operating conditions that could create a spark. This technology is typically used as part of a complete system, with safety barriers installed in the safe zone, and all devices located behind these barriers being intrinsically safe devices. The connectors, terminals, cables, and plastic components of intrinsically safe circuits must be marked in light blue.

It’s not possible directly; when working on something, don’t replace A with B – being strict will prevent mistakes.

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