Release 1 34-ST-25-19 RMA 3000 Remote Meter Assemblies User Manual 35
6/04
Methods of Protection
The following table summarizes available methods of protection for use in given
locations.
Protection Concept Designation Permitted Use Principle
Explosion-proof XP Division 1 & 2 Contains explosion and quenches
flame.
Intrinsic Safety IS Division 1 & 2 Limit energy of sparks under normal
and fault conditions.
Pressurized Type X and Y Division 1 Keeps flammable gas out.
Pressurized Type Z Division 2 Keeps flammable gas out.
Non-incendive NI Division 2 No arcs, sparks or hot surfaces
under normal conditions
Temperature
Classification
Equipment intended for installation directly within the hazardous location
classification must also be classified for the maximum surface temperature that can be
generated under normal or fault conditions as referenced to either 40°C (104°F) or the
maximum operating ambient of the equipment (whichever is greater). The maximum
surface temperature must be less than the minimum auto-ignition temperature of the
hazardous atmosphere present. The temperature shall be indicated in identification
numbers as listed in the following table.
Maximum Temperature
Degrees C Degrees F Identification Number
450 842 T1
300 572 T2
280 536 T2A
260 500 T2B
230 446 T2C
215 419 T2D
200 392 T3
180 356 T3A
165 329 T3B
160 320 T3C
135 275 T4
120 248 T4A
100 212 T5
85 185 T6
To Next Page
Loading...
Need help?
General
