Emerson Process Management 5300 manual Interface Measurements with Fully Submerged Probes

Reference Manual

00809-0100-4530, Rev BA July 2009

Rosemount 5300 Series

INTERFACE MEASUREMENTS WITH FULLY SUBMERGED PROBES

Figure 7-11. Interface Level measurements in a full chamber.

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].

FOUNDATION 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.

Interface Distance

Interface Level

Product Level is ignored

Interface Level is measured

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.

7-15