Emerson Process Management ROSEMOUNT 5300 - Manual (Page 145)

Reference Manual
00809-0100-4530, Rev BA
July 2009
7-15
Rosemount 5300 Series
INTERFACE
MEASUREMENTS WITH
FULLY SUBMERGED
PROBES The Rosemount 5300 series has a measurement option which makes it
possible to handle interface measurements when the probe is fully
submerged into the upper product, see Figure 7-11, and only the interface
level is detected by the transmitter. Even if the upper product level drops, it is
ignored by the transmitter which continues to measure only the interface level,
but the measurement accuracy is reduced since the transmitter does not take
into account the influence of the air gap above the product surface. To
achieve high accuracy in this measurement mode, the probe must be fully
submerged, or a 5302 for Level and Interface measurements should be used.
The Measurement Mode parameter is available via the
HART command [2, 3, 3].
F OUNDATION Fieldbus parameter: TRANSDUCER 1100>MEAS_MODE
Choose the Interface Level with Submerged Probe option.
Measurement mode Interface Level with Submerged Probe can also be
activated in the RRM software:
1. In the RRM workspace, click the Tank icon.
2. Select the Environment tab.
3. Select the Measurement Mode Interface Level with Submerged Probe
option.
4. Click the OK button.
NOTE!
Do not use Measurement Mode Interface Level with Submerged Probe in
applications when both Interface Level and Product Level are available.
Figure 7-11. Interface Level
measurements in a full chamber.
NOTE!
Adjust Surface Threshold if the interface level pulse is not detected. Note that
in Submerged Mode the interface is picked up by the Surface Threshold. See
also “Using the Echo Curve Analyzer” on page 7-10.
Interface Distance
Interface Level
Product Level
is ignored
Interface Level is
measured