Troubleshooting guide

79
Reference Manual
00809-0100-4308, Rev BA
Section 6: Service and Troubleshooting
December 2014
Service and Troubleshooting
Level stuck in full.
 The tank is full. Check the product level.
 Check Thresholds, see “Adjusting
thresholds” on page 84.
 The transmitter has locked on disturbing
obstacles at top of the tank. See “Handling
disturbances at the top of the tank” on
page 92 for recommended actions.
 The transmitter is configured with wrong
Probe Type, refer to “Probe Type” on
page 161.
 The reference peak is not detected since it is
weaker than the Reference Threshold. Adjust
Reference Threshold to an appropriate value
so that reference peak is not filtered out.
Refer to “Adjusting thresholds” on page 84.
Level stuck in measuring range.
 May be caused by a disturbing object in the
tank. Read the Echo Curve and adjust
Thresholds, see “Adjusting thresholds” on
page 84.
 Check if the probe is bent and in contact with
the tank wall. This contact causes a false
echo reading.
 Heavy coating or contamination on the
probe. Clean the probe.
Level stuck in empty.
 Thresholds may be too high, see “Adjusting
thresholds” on page 84.
Level fluctuations (a couple of inches).
 There is too much disturbing noise in the
tank (from foam, splashing etc.). Set the
Performance Mode to High to get a stable
measurement signal, refer to “Noise or weak
surface echoes” on page 97.
 There are rapid level changes in the tank.
Select a faster Update Rate, refer to
“Configure Update Rate” on page 51.
 Thin oil layer on top of water that is
sometimes detected, sometimes not. Set
the Peak Detection Method to Threshold
Intersection to improve the stability of level
measurements in such applications. Refer to
“Resolving thin oil layers” on page 91.
Symptom Possible cause and recommended actions