Emerson Rosemount 5408, Reference Manual

Page: 111 / 274

Table 7-6: Incorrect Level Readings
(continued)
Symptom
(1)
Possible causes Recommended actions
Incorrect level when using still pipe.
Level
Time
Device is not configured for
still pipe measurement. Enable pipe measurement, see Mounting
type .
Incorrect Pipe Inner Diameter
configuration. Verify the configured Pipe Inner Diameter
matches the physical inner diameter.
Ghost echo problems below
the product surface. Enable the Track First Echo function, see
Handling ghost echoes in still pipes .
Measured level is correct at 0% (4 mA) but
incorrect at 100% (20 mA).
Level
Time
Upper Range Value is not set
correctly. Check that the Upper Range Value
matches the 100% (20 mA) level in the
tank.
Incorrect level when the product surface is
above the 50% level.
Level
Time
Strong double bounce echo
that is interpreted as the
product surface. Enable the Double Bounce Handling
function, see
Handling strong double
bounce echoes .
Measured value drops to zero level.
Level
Time
Transmitter has locked on a
strong tank bottom echo. • 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
Enable
bottom echo visible when tank is
empty
.
Reference Manual Service and troubleshooting
00809-0100-4408 February 2020
Rosemount 5408 and 5408:SIS Level Transmitters 111