How should this sentence be understood? Please discuss.
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For the selection of field instruments with analog signals in the main equipment area, intrinsically safe types should be preferred; however, instruments connected to combustible gas and toxic gas detection systems (GDS) should be designed to be explosion-proof. Hello, experts. How should I understand this sentence? Is the flameproof rating higher than the intrinsically safe safety level?
Flammable and toxic gas detectors cannot be designed as intrinsically safe types; they all operate on a three-wire system with external power supply, and explosion-proof versions are required. Additionally, flow meters with high power consumption, as well as electromagnetic ones, are generally manufactured in explosion-proof versions
Don’t pay attention to the nonsense from upstairs; many electromagnetic and mass-related components are connected to intrinsically safe circuits, and the flow meter itself is of intrinsically safe, explosion-proof type.
A bit confused – intrinsically safe, explosion-proof. Please continue the discussion. Thank you
It has been clearly explained on the second floor.
The second floor is supported; an intrinsically safe circuit must consist of components from the measuring instrument to the safety barrier, and some cables as well – all of which need to be of the intrinsically safe type in order for it to be considered an intrinsically safe circuit. At present, some types of instruments can only be made intrinsically safe, so it is not practical to force them to be intrinsically flameproof. Based solely on this statement, my understanding is that the GDS system does not require the installation of safety barriers; therefore, it can be inferred that the field instruments can use explosion-proof designs. Additionally, the explosion-proof type is suitable for areas: it can only be installed in hazardous areas classified as Zone 1 or Zone 2. Intrinsic safety application areas: (1) E*a: Devices that can maintain their explosion-proof properties even in the presence of failures in two components or other types of faults. Intrinsic safety devices can be installed in Zone 0, Zone 1, and Zone 2 hazardous areas. E*a intrinsically safe equipment is the only explosion-proof electrical equipment that can be installed in Zone 0. (2) E*b: Devices that can maintain their explosion-proof properties even in the event of a failure in a component or some other type of fault. Intrinsic safety equipment can be installed in Zone 1 and Zone 2 hazardous areas. It clearly shows who is taller and who is shorter
I think both the toxicity and flammability detectors come equipped with large display panels as well as audible and visual alarms, and their power consumption is so high that it exceeds what an intrinsically safe circuit can handle
Most two-wire instruments can be made intrinsically safe. For gas detection, LEL catalytic combustion types cannot be designed as two-wire intrinsically safe types; therefore, most of them are three-wire flameproof types. Gas detectors operate on electrochemical principles, and it is possible to make them intrinsically safe in a two-wire configuration. For consistency, the design specifies the gas as flameproof to facilitate wiring and management.
The people upstairs have all given very good suggestions; I now understand. Thank you all for your guidance
One is the instrument, and the other is the system