7ML19985FH04 SITRANS LR 400 – INSTRUCTION MANUAL Page 46Parameters (HART)4.2.3.4: Window Tracking (F = Off)A window follows the measured value which it is forced to track. The window size iscalculated from the set filling speed. Switch off window tracking for applications wherethe SITRANS LR 400 is unable to keep up to level changes. By using SIMATIC PDM, youcan display a list of all echoes in your vessel. It provides the distance between the flangeand the measuring medium’s surface, as well as the distances of fixed targets. Thesemay be directly used and transferred to the fix distance list.4.2.3.5: Tank Empty Detect (for qualified personnel only)This parameter is for Factory Authorized Personnel Only.4.2.3.6: Auto Fix Distance (for qualified personnel only)This parameter is for Factory Authorized Personnel Only.4.2.3.7: Fix Distance List (for qualified personnel only)This parameter is for Factory Authorized Personnel Only.4.2.3.7.1 to 4.2.3.7.9: Fix Distance Values (for qualifiedpersonnel only)These parameters are for Factory Authorized Personnel Only4.2.3.8: Auto False Echo Suppression (F = Use)Learns and records the current signal up to the suppression distance setting. Thesesignals are then ignored during operation.If all signals fall below this defined threshold, then the failsafe timer is initiated.Value OnOffNote: This function works best when the vessel is nearly empty. For best results, donot record or learn when the vessel is completely empty.ValueOffRecordUse