P007: Span; P838 Auto False Echo Suppression - Siemens SITRANS L Series Compact Operating Instructions

6.2.11.7

P007: Span

Set the range to be measured (P007: Span)
Value
Enter the distance between Empty (process empty level) and Span (process full level), in the
units set in P005. Span can be set at any distance above Empty level.
Note
• Setting P006 resets Span, if it has not previously been set to a different value.
• The default setting for Span is based on Operation (P001) and Empty (P006). Span is set
to Empty minus 110% of Blanking distance, unless Operation is set to distance (P001=3).
In this case, Span is set to Empty distance. Blanking distance is 0.3 m (1 ft), plus the
shield length (if any).
• Always prevent the monitored surface from approaching within 0.3 m (1 ft) of the
reference point, as this is the minimum distance detectable.
6.2.11.8

P838 Auto false echo suppression

Enable False-Echo Suppression (P837: Auto False-Echo Suppression)
P837 instructs SITRANS Probe LR to learn the echo profile at that moment, and use the
learned profile instead of the default TVT curve.
Parameter
P837
Set up Auto False-Echo Suppression:
● Perform this function when the vessel is empty or nearly empty.
● First rotate the instrument for best signal (lowest false-echo amplitude)
● Determine distance from reference point to material level and subtract 0.5 m (1.6 ft).
● Press PROGRAM
● Select P838, key in [distance to material level minus 0.5 m/1.6 ft], and press ENTER .
● Select P837.
● Press 2 and then press ENTER
TVT) after a few seconds.
● Press PROGRAM to return to RUN mode.
SITRANS Probe LR with mA/HART
Compact Operating Instructions, 05/2019, A5E46248119-AC
Range 0.0000 to 20.00
Default 19.56 (see note below)
Value Description
0 Off
1 * Use "Learned" TVT
2 "Learn"
, then DISPLAY .
. P837 will automatically revert to 1 (use Learned
Commissioning
6.2 Local commissioning
35