Siemens LU01 P711 Echo Lock, P712 Echo Lock Sampling, P711 value P712 preset value

P711 Echo Lock

Use this feature to select the measurement verification process.

	0		Off
Values	1		Maximum verification
	2	*	Material agitator
	3		Total lock
	• P700 Max Fill Rate
	• P701 Max Empty Rate
Related	•	P712 Echo Lock Sampling
	• P713 Echo Lock Window
	•	P820 Algorithm

If a material agitator (mixer) is used in the vessel monitored, set Echo Lock for maximum verification or material agitator to avoid agitator blade detection. Ensure the agitator is always ON while the SITRANS LU01 is monitoring the vessel to avoid stationary blade detection.

When set for max verification or material agitator, a new measurement outside of the Echo Lock Window (P713) must meet the sampling criterion (P712).

For total lock, Echo Lock Window (P713) is preset to zero 0. The SITRANS LU01 continuously searches for the best echo according to the algorithm chosen (P820). If the selected echo is within the window, the window is then centered about the echo. If not, the window widens with each successive shot until the selected echo is within the window. The window then returns to its normal width.

When Echo Lock is OFF , the SITRANS LU01 responds immediately to a new measurement as restricted by the Max Fill / Empty Rate (P700 / P701); however, measurement reliability is affected.

P712 Echo Lock Sampling

The sampling criterion sets the number of consecutive echoes appearing above or below the echo currently locked onto, that must occur before the measurements are validated as the new reading (for Echo Lock P711 values: 1 or 2).

	Range: 1:1 to 99:99
Values	Format: x:y
	x = the number of above echoes
	y = the number of below echoes
Related	•	P711 Echo Lock

P711 value	P712 preset value
1, max verification	5:5
2, material agitator	5:2

Parameters

7ML19985BE02 SITRANS LU01 – INSTRUCTION MANUAL Page 61