Interface Measurements With Fully Submerged Probes - Emerson Rosemount 3308A Reference Manual

Reference Manual
00809-0100-4308, Rev CA
6.5.3

Interface measurements with fully submerged probes

The Measurement Mode Interface Level with Submerged Probe is used to handle interface
measurements when the product level is not visible, for example in a full chamber pipe as illustrated in
Figure 6-17. In this case the probe is fully submerged into the upper product, 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. If the product level drops, the air filled region in the upper part of the pipe will slightly
reduce the measurement accuracy of the interface level. To achieve high accuracy in this Measurement
Mode the probe must be fully submerged.
To set the Measurement Mode to Interface Level with Submerged Probe:
1. Select Configure > Manual Setup > Level Setup > Environment.
2. Under Measurement Mode, select Interface Level with Submerged Probe (Interface Only in Field
Communicator), and then select Send.
Note
Do not set Measurement Mode to Interface Level with Submerged Probe in "standard" applications
when both Product Level and Interface Level are measured.
Figure 6-17. Interface Level Measurements in a Full Chamber
A. Interface distance
B. Interface level
C. Product level is ignored
D. Interface level is measured
Note
Adjust Interface Threshold if the interface level pulse is not detected.
Service and Troubleshooting
PRELIMINARY
A
B
Service and Troubleshooting
C
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