Answer Posted / rizwan afzal

Suppression.If transmitter is installed in such
configuration that positive pressure is acting on the HP
side even when level in tank is zero. Such as Tx is
installed below datum point then head pressure of impulse
line is always acting on the HP side of the Tx even if tank
is empty, to componsate that head pressure a -ve biasing is
applied which is equal to the head pressure.
IN OTHER WORDS the LRV of Tx is kept at +ve pressure(equal
to head pressure causing error), so that Tx should give 4mA
at that head pressure.


Elevation.If transmitter is installed in such configuration
that positive pressure is acting on the LP side(DP is in -
ve value when level in tank is zero). Such as Tx is
installed in wet leg configuration then head pressure of
wet leg is always acting on the LP side of the Tx (even if
tank is empty), to componsate that head pressure a +ve
biasing is applied.
IN OTHER WORDS the LRV of Tx is kept at -ve pressure(equal
to head pressure causing error), so that Tx should give 4mA
at that head pressure.
Or to keep range in +ve, Tx can be installed in such manner
that LP side is connected with datum point and HP side with
Wet leg.

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