Demystifying Hazardous Area Classifications
Under IS/IEC 60079 and Petroleum Rules in India, hazardous areas are classified according to the likelihood and duration of the occurrence of an explosive atmosphere:
- Zone 0: An area in which an explosive atmosphere is present continuously or for long periods (e.g., inside fuel tanks).
- Zone 1: An area in which an explosive atmosphere is likely to occur in normal operation (e.g., around pump seals, sampling points). Equipment must be certified Flameproof (Ex d) or Intrinsically Safe (Ex ia/ib).
- Zone 2: An area in which an explosive atmosphere is not likely to occur in normal operation, and if it occurs, will exist only for a short time.
Gas Group Classification: IIA, IIB, and IIC
Gases are categorized by the energy required to ignite them and the maximum experimental safe gap (MESG):
- Gas Group IIA: Propane, Methane, Acetone (Least hazardous industrial gases).
- Gas Group IIB: Ethylene, Town Gas, Ethyl Ether.
- Gas Group IIC: Hydrogen, Acetylene, Carbon Disulfide (Most easily ignited gases requiring the tightest flamepath tolerances).
All Flameproof Instrumentation products are engineered to comply with the highest standard, Gas Group IIC, making them universally safe for IIA, IIB, and IIC applications.
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Speak directly with Aditya / Technical Sales Desk for pricing and PESO certificates.
Frequently Asked Questions
Q: Can a Gas Group IIC fixture be used in a Gas Group IIA or IIB zone?
Yes! Gas Group IIC is the most stringent standard. Any equipment certified for IIC is automatically approved and safe for Gas Groups IIA and IIB.
Q: What does Temperature Class T6 signify?
T6 means the maximum exterior surface temperature of the equipment will never exceed 85°C even during continuous full-load operation.