Emerson Rosemount 5402 Reference Manual page 202

Service and Troubleshooting
October 2018
188
Measured value is locked.
Measured value drops to
zero level.
Measured value drops to
zero level.
(You can verify Empty Tank
state by opening the Tank
Display window in RRM).
Measured level jumps to a
lower value.
Reference Manual
00809-0100-4026, Rev KC
May be caused by a disturbing object in the tank
Action:
Remove the disturbing object.

Move the transmitter to another position.

Use the Echo Tuning function in RRM to

register the false echo causing the transmitter
to lock at the wrong level, see
on page 109.
Put an inclined metal plate on top of the

disturbing object.
May be caused by strong echoes from the tank
bottom when the product is slightly
transparent.
Action:
Check the Tank Height.

Make sure that the Bottom Echo Visible

parameter is enabled, see
visible" on page 260 and
Tank Bottom Projection function if the
following conditions are met:
– T
he product is transparent
–
The tank bottom echo is visible
If the transmitter loses track of the surface
within the Empty Tank Detection Area, the tank
is considered empty. See section
detection area" on page 260
Action:
If possible, try another mounting position.

May be caused by two products layered in the
tank.
Action:
Enable the Double Surface function,

see "Surface echo tracking" on page 262.
RRM: Setup > Advanced
Service and Troubleshooting
"Echo tuning"
"Bottom echo
264. Try using the
"Empty tank
and 265.