ABB LMT Series Operating Instruction page 53

L M T 1 0 0 A N D L M T 2 0 0 | M A G N E TO S T R I C T I V E L E V E L T R A N S M I T T E R S | F F O I/ L M T 1 0 0/ 2 0 0/ F F - E N R E V. A
5 Calibration when float cannot be moved to 0% or 100%
points (dry calibration)
Conditions • Probe Length = 220 cm
• Mount Orientation = Bottom or Top
• ML = 200 cm
• Current level = 35%
Procedure • Capture SVL for parameter <In> of point 01
• Set parameter <Out> of point 01 to 70 cm (35%)
• Take the <In> parameter of point 01 and add 130
cm, which is the remaining 65% (for bottom
mounted units), or substract 130 cm (for top
mounted units)
• Use the resulting sum for parameter <In> of point
00
• Set 200 cm for parameter <Out> of point 00
• End
6 Changing mount orientation
Conditions • Device Model = LMT200
• Probe Length = 220 cm
• Mount Orientation = Bottom or Top
• ML = 200 cm
• Previously calibrated for a different mount
orientation
Procedure • Record the current Level Value before the mount
orientation change
• Change the mount orientation from Top to Bottom
or vice versa
• Change the Signal Polarity in the Diagnostic Menu
(typically Standard for bottom mount and Flipped
for top mount)
• If the points were just swapped and kept in the
same position (point 00 became point 01 and vice
versa), the level indicated may deviate between 2-3
mm from what was read in the original mount
orientation If the points were physically displaced
up or down, the deviation may be larger
• Calculate the deviation of the level reading between
previous and new mounting
• There are two ways to handle this:
- Edit the parameter <Out> for both points 00 &
01 to add the determined deviation
- Apply Offset Notice that when the Offset is
used, it leaves behind the LRV & URV, which
need to be set again
• End
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