The true core advantages of intrinsically safe instruments over non-intrinsically safe instruments (including flameproof types), along with the most practical aspects from an engineering perspective；

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Advantages of intrinsically safe instruments over non-intrinsically safe instruments: 1. Higher safety level – Intrinsically safe (ia) is the only explosion-proof type permitted for Use Zone 0. - Non-intrinsic safety types (such as flameproof) cannot be used in Zone 0; they can only be used in Zones 1 and 2. 2. Can be opened while energized, allows for online debugging, and maintenance without shutting down production – Operation on the intrinsically safe circuit while it is energized poses no risk of ignition; wiring, calibration, and connection/disconnection can be carried out directly at the site. - It is strictly prohibited to open non-intrinsic safety/explosion-proof instruments while they are powered on; the power must be turned off, which can disrupt production. 3. Installation and wiring are simpler and cheaper – intrinsically safe systems do not require explosion-proof steel pipes, complex seals, or isolated wiring. - The cable can be installed in the same conduit as ordinary wires, allowing for faster construction and reduced material usage. 4. Small size, light weight, and easy to install – Intrinsic safety instruments lack heavy explosion-proof enclosures, making them suitable for tight spaces and areas with numerous mounts. - The enclosures of non-intrinsic safety explosion-proof instruments are bulky and difficult to install. 5. Higher system reliability and lower failure rate – Intrinsic safety involves circuits with limited power; low voltage and current mean that it is less likely for the cards or modules to get damaged. - It provides natural protection against surges and overcurrents, offering greater safety for DCS/PLC systems. 6. The circuit structure is simple, facilitating unified design – safety barriers are provided uniformly in the control room, and the signal circuits across the entire plant are standardized. - For non-intrinsic safety applications, wiring must be arranged in explosion-proof/non-explosion-proof zones, resulting in complex design. 7. Easier maintenance and replacement – Intrinsic safety instruments can be replaced directly online, without the need for approval, power shutdown, pressure release, or firework operations. - The replacement process for non-intrinsic safety flameproof devices is complicated and involves many risk factors. In short, intrinsically safe instruments are safer, suitable for Zone 0, allow maintenance while energized, are easy to install, lightweight and reliable, and result in a more standardized system ； Non-intrinsic safety (explosion-proof) is only suitable for high-power equipment and applications where no on-line maintenance is required.