Page 36
Pointek CLS 500 – INSTRUCTION MANUAL
7ML19985GG03
mmmm
m
Int
e
rc
onnect
ion
Note:
Grounding Pointek CLS500 as illustrated above provides only system grounding
for referencing purposes: it does not provide safety grounding.
Cathodically
Protected Metal
Tanks
Cathodically protected metal tanks
are never directly grounded.
However, the impedance of the
supply source is so low that it will
not cause any problems. The
shielding of the loop cable should
be grounded at one end only (the
tank end) to avoid short-circuiting
the cathode protection voltage.
The ground lug on Pointek CLS 500
can be connected to the tank as
shown.
(See page 33 for further grounding
details.)
metal
ground lug
V
KP
Non-Conductive Tanks
Non-metallic tanks always require a proper
grounded conductive medium: connect the
ground lug on the Pointek CLS 500 to earth
ground.
With non-conductive contents:
• there must be a solid connection from
the instrument to a grounded object in
the environment (a metal tank wall, or
the metal frame of a non-conductive
tank).
With conductive contents:
• the vessel contents must be grounded,
for example by being in contact with a
grounded metal pipe.
ground lug
non-
metallic