Answer Posted / abdul hameed

Dear Instrumentation Friends,

The Loop checking is defined as pre-Commissioning activity
which is initiated after installation of instruments at x
location to y location instruments or systems.

Loop checking is basically done to ensure the instruments
installed at x and y location has continuity signal with
each other potential's.

If we want to loop check the continuity from instrument to
junction box this is acheieved by laying a cable between
instrument and jounction box.

Normally after installation and cable laying during
construction activity is to be ensured that instrument and
cable and junction termianls and cable which is layed
underground or above ground & is not damaged to confirm this
damage it is mandatory to carry out loop checking between
instruments-junction box- Dcs that is from field to control
room.

Simple Process:- is short the two cores of cable at one end
and check with digital multimeter at other end if the
circuit resistance is ok then the same cores have the cont
unity which means that the cable cores are'nt damaged.

above procedure also helps to identify the particular cable
cores for specific system founction

Above process is called as Cold Loop Checking loop checking
without any external sorce simulation.hencecalled as cold
loop check.

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