Troubleshooting Guide - Emerson Rosemount 5408 Reference Manual

Table 7-5: Status - Maintenance Required
LCD display Host diagnostic mes-
message sage
VAR OUTRNG Linearized Variable Out
of Range
DC DEGRAD Dielectric Constant Esti-
mation Degraded
7.3

Troubleshooting guide

If there is a malfunction despite the absence of alerts,
information on possible causes and recommended actions.
The troubleshooting guide contains the following symptoms:
•
•
Table 7-6: Incorrect Level Readings
(1)
Symptom
Reported level is too high or low.
Level is stuck in measuring range.
Rosemount 5408 and 5408:SIS Level Transmitters
(continued)
Description
The level measurement is outside
the configured range for volume or
scaled variable, or both.
Accuracy of volume/scaled variable
measurement may be degraded.
The dielectric constant estimation is
degraded.
Accuracy of level measurement
may be degraded.
Incorrect level readings (see
Troubleshooting the 4-20 mA/HART output (see
Possible causes
Incorrect tank geometry con-
figuration.
Time
Incorrect alignment of the
transmitter.
Recommended actions
1. If volume strapping table is
2. If scaled variable table is used,
1. Check configuration of Bottom
2. Check configuration of Refer-
3. If not needed, disable Tank Bot-
Table 7-6
Table 7-6)
Table
Recommended actions
• Verify the tank geometry parameters
are configured correctly (especially the
Reference Height).
• Run Verify Level to adjust level meas-
urement, see
• Analyze the echo curve and check am-
plitude thresholds, see
Amplitude
• Restore default settings and reconfig-
ure the device.
• Verify the transmitter head is correctly
aligned, see
Service and Troubleshooting
used, make sure level values
within operating range are in-
cluded.
make sure input variable values
within operating range are in-
cluded.
Product Dielectric Constant.
ence Height and Bottom Offset.
tom Projection.
see and Table 7-7 for
7-7)
Section 5.7.
thresholds.
Section 3.5.7.
91