Eclipse 705 Installation And Operating Manual page 22

PACTw re™ – Configuration and Troubleshooting
Echo Curve patterns
Below screens are examples of the most typical echo curves that occur in normal operation / error condition.
Normal oil/water interface
Normal signal pulses from oil over water
Dry Probe
Signal pulse from an empty vessel/ cage – displayed mes-
sage on the unit is «DryProbe» Dry Probe
Weak Signal
Signal pulse of a weak signal. Displayed message is
«WeakSgnl». Solve this by either to:
- change dielectric setting to a lower range or
- increase the sensitivity
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Level with Blocking Distance correction
Signal pulse from level. Unit suffered from build up on top
of the probe. The introduced blocking distance (see area in
frame) solves the problem.
EOP High or Low
Signal pulse from an empty vessel or cage but with wrong-
ly entered probe length – displayed message is «EOP
High» or «EOP Low» (as shown in graph). Correct the
probe length in either case.
Threshold Fixed or CFD
Signal pulse of oil over water level. Always select
«Threshld Fixed» (as shown in the graph). «Threshld
CFD» will track the stronger reflection pulse. In case of level
measurement, the unit will not compensate for the signal
velocity in the upper oil layer and show an erroneous level
reading.