Most conventional instruments are installed either inside a vessel or in a bridle.Due to the maintenance issues, i.e. a vessel would need to be isolated to access an internal
instrument, generally instruments are installed in a bridle. Bridles are designed to
duplicate conditions inside the vessel, but this is virtually impossible – there are usually
only two tapping points, therefore fluids only at the density of the tapping points can enter
the bridle and the temperature of the bridle is unlikely to be the same as the vessel.
"Almost" Good Answers: