Siemens sitrans LU01 - Manual (Page 109)

7ML19985BE02 SITRANS LU01 – INSTRUCTION MANUAL Page 103
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Increase the Confidence Threshold (small amounts at a time) while observing the results.
If performance is not improved return the Confidence Threshold to the preset value.
Connect an oscilloscope to the SITRANS LU01, (see Enhancement Parameters Scope
Displays, P810). While monitoring the Echo Marker, select the Algorithm (P820) best
suited to the material/conditions.
If the Area algorithm is used and narrow noise spikes are evident on the (long shot) Echo
Profile, turn the Spike Filter (P821) on and/or widen the Narrow Echo Filter (P822). Also, if
the true echo has jagged peaks, use Reform Echo (P823).
If multiple echoes appear on the Echo Profile, typical of a flat material profile (especially if
the vessel top is domed), use the first Algorithm.
If the Echo Profile repeatedly switches from short to long, adjust the Short Shot Range
(P852) to stabilize the shot mode used for the echo evaluation. Also, adjust the Short Shot
Bias to increase (or decrease) the amount of preference given to short shot echoes over
long shot echoes.
Should a stable measurement still not be attainable, contact Siemens Milltronics or your
local distributor.