Endress+Hauser Levelflex FMP53 - The Probe length correction sequence; Confirm length

Levelflex FMP51, FMP52, FMP54 Description of device parameters (operating menu)
Endress+Hauser 145
The "Probe length correction" sequence
The Probe length correction sequence helps to ensure that the end of probe signal within the
envelope curve is correctly assigned by the evaluation algorithm. The assignment is correct if the
length of probe indicated by the device matches the acutal lenght of the probe. The automatic
probe length correction can only be performed if the probe is installed in the vessel and is
completely uncovered (no medium). For partially filled vessels and if the probe length is known,
select the Manual input option in the Confirm length parameter in order to enter the value
manually.
If a mapping (interference echo suppression) has been recorded after shortening the probe, it
is no longer possible to perform an automatic probe length correction. In this case there are
two options:
•
Delete the map (® ä 124) before performing the automatic probe length correction.
Thereafter a new map can be recorded.
•
Alternative: Select the Manual input option in the Confirm length parameter and enter
the probe length manually into the Present length parameter.
In the case of a grounded end of probe the Positive EOP option must be selected in the
Expert ® Sensors ® EOP evaluation ® EOP search mode parameter. Otherwise the
automatic probe length correction will not work.
Confirm length
Navigation
Setup ® Advanced setup ® Probe length corr. ® Confirm length
Description
Confirm whether the value indicated in the Present length parameter matches the actual length
of the probe.
Selection
• Probe length OK
To be selected if the indicated length is correct. An adjustment is not required. The device quits
the sequence. ("End of sequence" is displayed).
•
Length too small
To be selected if the indicated length is smaller than the actual length of the probe. A different
end of probe signal is allocated and the newly calculated length is indicated in the Present
length parameter. This procedure has to be repeated until the displayed value matches the
actual length of the probe.
• Length too big
To be selected if the indicated length is bigger than the actual length of the probe. A different
end of probe signal is allocated and the newly calculated length is indicated in the Present
length parameter. This procedure has to be repeated until the displayed value matches the
actual length of the probe.
• Probe covered
To be selected if the probe is (partially or completely) covered. A probe length correction is
impossible in this case. The device quits the sequence. ("End of sequence" is displayed.)
• Manual input
To be selected if no automatic probe length correction is to be performed. Instead, the Present
length parameter appears and the actual length must be entered manually.
In the DTM Manual input needs not to be selected explicitly. Here, manual editing of the
probe length is always possible.
• Length unknown
A probe length correction is impossible in this case. The device quits the sequence. ("End of
sequence" is displayed.)
Factory setting
Probe length OK