Siemens LC 500 사용자 설명서
Page 28
SITRANS LC 500 – INSTRUCTION MANUAL
7ML19985GE01
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Int
er
connect
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Grounding Examples: SITRANS LC 500
Grounding is important for two reasons:
1.
To prevent interference to the signal: system grounding
2.
For safety purposes: safety grounding
Several common applications are illustrated. They are separated into two groups: the first
group illustrates System Grounding and the second illustrates Safety Grounding.
group illustrates System Grounding and the second illustrates Safety Grounding.
System Grounding (referencing)
For the measuring system to function correctly, the reference electrode must be properly
grounded. Make sure that there is a reliable connection from the instrument housing to
the reference electrode (usually a metal tank). Some common applications involving
system grounding include:
grounded. Make sure that there is a reliable connection from the instrument housing to
the reference electrode (usually a metal tank). Some common applications involving
system grounding include:
• metal tanks
• metal tanks, cathodically protected
• non-conductive tanks
• metal tanks, cathodically protected
• non-conductive tanks
Metal Tanks
If the metal tank is reliably
grounded, connect the ground lug
on the SITRANS LC 500 to the
earth ground on the tank as
shown.
(See page 26 for connection
diagram.)
ground lug
metal