Describe based on the image -- Intrinsically safe solenoid valve
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Hello everyone, I have a few questions: 1. Can an intrinsically safe solenoid valve be used as a substitute for an explosion-proof solenoid valve? 2. As shown in the figure, it is a intrinsically safe solenoid valve, but the cable used is not intrinsically safe. In the face of such a problem, do we need to make corrections? How to make corrections? Thank you for the reply and discussion.
It must be emphasized first that intrinsic safety requires that all components making up the circuit be intrinsically safe, in order to form an intrinsically safe circuit. The intrinsically safe solenoid valve uses a non-intrinsically safe cable, which does not form an intrinsically safe circuit, and therefore cannot achieve intrinsic safety. The intrinsically safe solenoid valve can be replaced by an explosion-proof solenoid valve, depending on the driving power of the solenoid valve. Generally, intrinsically safe solenoid valves require less driving power. If the entire circuit is designed as an intrinsically safe circuit (even though non-intrinsically safe cables are used and a safety barrier is employed for isolation, the power of such a circuit is still limited), it may not be sufficient to drive explosion-proof solenoid valves.
As the expert said, if intrinsically safe technology is used as a substitute for explosion-proof technology, could there be potential risks? Maintenance personnel, seeing that it is an intrinsically safe device, might simply open the cover to carry out repairs. Of course, this situation is relatively rare.
As the expert said, if intrinsically safe technology is used as a substitute for explosion-proof technology, could there be potential risks? Maintenance personnel, seeing that it is an intrinsically safe device, might simply open the cover to carry out repairs. Of course, this situation is relatively rare.
Intrinsic safety applies to cables, field devices, safety barriers, power supply, etc.; all of these must meet intrinsic safety requirements. If a cable is not intrinsically safe, it means that circuit does not meet these requirements
Since it does not meet the requirements of an intrinsically safe circuit, can intrinsically safe instruments be used if it is treated as a flameproof circuit?
No, safety barriers are not suitable for non-intrinsic safety circuits, as this can lead to the generation of dangerous electric sparks during instrument production. Moreover, field instruments are of intrinsic safety type and lack a robust casing, making them prone to explosion. Intrinsic safety instruments must be used in intrinsic safety circuit systems. The elements that make up such a circuit include safety barriers, cables, and field instruments; all of these components need to be intrinsically safe, as the absence of any one of them prevents the formation of an intrinsic safety circuit
There are intrinsically safe solenoid valves too; I learned something new. The switch valves we commonly use are flameproof solenoid valves equipped with intrinsically safe NAMEUR switches. I’ve really never seen a intrinsically safe proximity switch paired with an intrinsically safe solenoid valve.
It’s better to use a intrinsically safe cable; the multiple pairs of conductors in such a cable must each have their own shielding layer, which reduces the inductance of the cable. I searched online; it’s a blue cable