Hazardous
Substance
Present for Long
Periods (1000 hours
above per year)
Present in Normal
Operation (10–1000 hours
per year)
Present in Abnormal
Operation (10 hours below
per year)
Gases
Zone 0
Zone 1
Zone 2
Dusts
Zone 20
Zone 21
Zone 22
z
Zone 0: a place in which an explosive atmosphere consisting of a mixture with air of dangerous
substances in the form of gas, vapor or mist is present continuously or for long periods or frequently.
z
Zone 1: a place in which an explosive atmosphere consisting of a mixture with air of dangerous
substances in the form of gas, vapor or mist is likely to occur in normal operation occasionally.
z
Zone 2: a place in which an explosive atmosphere consisting of a mixture with air of dangerous
substances in the form of gas, vapor or mist is not likely to occur in normal operation but, if it does
occur, will persist for a short period only.
z
Zone 20: a place in which an explosive atmosphere in the form of a cloud of combustible dust in air is
present continuously or for long periods or frequently.
z
Zone 21: a place in which an explosive atmosphere in the form of a cloud of combustible dust in air is
likely to occur in normal operation occasionally.
z
Zone 22: a place in which an explosive atmosphere in the form of a cloud of combustible dust in air is
not likely to occur in normal operation but, if it does occur, will persist for a short period only.
1.4
No Misoperations
Stop operating the product and leave the blasting area immediately when the intrinsic safety or integrity
of the product is endangered, and deliver it to your local dealer for examination.
The safety or reliability of the product may be endangered when:
z
The product is stored improperly.
z
The product is faulty.
z
The product works with overload.
z
The product operates beyond the tolerance or threshold.
z
The product is damaged during transportation.
z
The product's housing is obviously damaged or cracked.
z
The logo or characters on the product are hard to be recognized.
