Emerson Rosemount 5408 Reference Manual page 111

Reference Manual
00809-0100-4408
Table 7-6: Incorrect Level Readings
(1)
Symptom
Incorrect level when using still pipe.
Measured level is correct at 0% (4 mA) but
incorrect at 100% (20 mA).
Incorrect level when the product surface is
above the 50% level.
Measured value drops to zero level.
Rosemount 5408 and 5408:SIS Level Transmitters
(continued)
Possible causes
Device is not configured for
still pipe measurement.
Incorrect Pipe Inner Diameter
configuration.
Ghost echo problems below
the product surface.
Time
Upper Range Value is not set
correctly.
Time
Strong double bounce echo
that is interpreted as the
product surface.
Time
Transmitter has locked on a
strong tank bottom echo.
Time
Service and troubleshooting
Recommended actions
Enable pipe measurement, see
type.
Verify the configured Pipe Inner Diameter
matches the physical inner diameter.
Enable the Track First Echo function, see
Handling ghost echoes in still
Check that the Upper Range Value
matches the 100% (20 mA) level in the
tank.
Enable the Double Bounce Handling
function, see Handling strong double
bounce echoes.
• Verify the Reference Height is
configured correctly.
• Enable the Tank Bottom Projection
function, see Use tank bottom
projection.
• Enable the Bottom echo visible when
tank is empty parameter, see
bottom echo visible when tank is
empty.
February 2020
Mounting
pipes.
Enable
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