Emerson Process Management ROSEMOUNT 5300 - Manual (Page 259)

Reference Manual
00809-0100-4530, Rev BA
July 2009
C-11
Rosemount 5300 Series
Probe End Projection is used to :
• Use the probe end echo as reference, in case the surface echo is lost,
to calculate the surface echo position
• Use the probe end echo as reference when the surface echo is close to
the probe end to enhance accuracy of the surface echo position
NOTE!
This function is only available for Liquid/solid product level measurement
modes (i.e. not available for interface or fully submersed interface
measurement modes) and a well defined probe end echo (i.e. ensure that the
probe end/centering disc/weight is either always in contact with the tank wall
or never in contact with the tank wall).
NOTE!
Assure that the Tank settings; Mounting Type, Probe Type, and Probe Length
have been assigned correct values before continuing.
Probe End Projection can be configured using a guide. When the tank is
empty, the guided setup will be able to accurately calibrate probe end offset
and probe end pulse polarity. You will be asked to insert an initial value for the
Product DC. This is the value for the product dielectric constant that the
device uses as a start point for estimation. This value must be as accurate to
the actual value of the dielectric constant as possible.
When the tank is filled, the guided setup will be able to estimate the Product
DC. This value is used as an initial value for future estimation of the Product
DC.
For best performance, complete the guided setup with an empty tank and
then a second time with a filled tank, but do not overwrite the empty tank
calibration.
Probe End Projection can be configured in RRM. This function can be
reached from the Device Specific Configuration in the Guided Setup (if the
configuration is recommended) or from the Advanced Configuration
window, Probe End Projection tab. Click Guided Probe End Projection
Setup to start the configuration.
Figure C-9. Probe End
Projection setup.
In 375 Field Communicator, the Device Specific Configuration is reached with
sequence [2, 1, 7, 2] (if the configuration is recommended) or from the
sequence: [2, 7, 2].
Optional configurations:
DC Estimation Limit: This is a limit for the product dielectric constant
estimation. The limit is a percentage, saying how much the estimated product
DC is allowed to differ from the initial product DC value. If the estimation goes
outside this limit, a warning will be generated.
Used Product DC: This is the estimated product dielectric constant that the
device will use for Probe End Projection.