Gas Data GFM600, Руководство пользователя

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G F M 6 0 0 U S E R M A N U A L
Appendix
C
Understanding
instruments for use in
flammable atmospheres
Hazardous areas classified by zones
There are three zones defined to guide users as to the necessary precautions, which
should be taken when working in potentially flammable atmospheres:
1. Zone 0 - An area in which an explosive gas/air mixture is continuously
present, or present for long periods.
2. Zone 1 - An area in which an explosive gas/air mixture is likely to occur in
normal operation.
3. Zone 2 - An area in which an explosive gas/air mixture is not likely to
occur in normal operation and if it does occur will exist only for a short time.
Make certain that the area in which you intend to work can be described by one of
the zones above.
THE GFM600
SERIES
IS SUITABLE FOR USE IN
ZONE 1 AND ZONE 2.
Different gas types.
Different gases are grouped according to how easily they are ignited. Some
examples
are given below. (For other gases please contact Gas Data).
GFM600 - 13 - GFM600 Velocity Monitor User Manual
Gas Relative Ignition Group
Hydrogen/Acetylene Most easily ignited IIC
Ethylene IIB
Carbon monoxide IIB
Hydrogen sulphide IIB
Ammonia IIA
Propane IIA