Endress+Hauser micropilot FMR 231 E Sicherheitshinweise Seite 8

en
XA 016F-A
–
HART electronics
+
5
9
Tank
Hazardous area
Zone 0
Fig. 1
Installation with overvoltage protection
e.g. armoured hose
Transmitter
*
Metal housing
Potential
bond
Potential bonding
(≤ 4 mm² Cu
Tank
Hazardous area
Zone 0
Fig. 2
2
Explosion hazardous area
HART electronics –
+
5
Tank
Hazardous area
Zone 1
Plant grounding system (here German practice)
Explosion hazardous area
Separate housing with
overvoltage protector
*
≤ 1000 mm
e.g.. HAW 262 Z
*
2 1
2
1
Potential
bond
*
)
Plant grounding system (here German practice)
*
Metal housing
Cable with screening or
metal sheath
Micropilot FMR 231E
Non-hazardous area
Certified
associated
apparatus
Non-hazardous area
Power supply or
evaluation unit
*
Must satisfy the requirements of EN 60079-14
for intrinsically safe circuits in Zone 0,
if the risk of dangerously high potential
differences within Zone 0 exists, e.g. by the
occurance of atmospheric electrical discharge.
Endress+Hauser