5.6 Measuring value compensation
Offset level from reference point and scale factor are adjusted under [4-3] “Offset
Calibration” and [4-4] “Span Calibration”. If there is a difference between the Tank ref.
point and the MRF-10 ref. point, you can input “G” for calibration [1-4].
5.7 Bottom recognition
Tank bottom recognition is necessary for measurement of low reflection targets such
as oil surfaces. In such cases, the smaller amplitude echo from liquid surface
reflections is concealed in the larger echo from the tank bottom and the gauge can
not distinguish the surface reflection echo from the bottom echo.
[5-7] “Bottom Visible” and [4-5] “Zero cut” parameters of the gauge function to avoid
the tracking of bottom echoes. Initial settings of these parameters are [5-7] “Bottom
Visible” and [4-5] “Zero cut” as 0m.
The gauge outputs level value as the bottom level, when the surface echo is in the
low cut area. However when the level is higher and the surface echo is not in the low
cut area, the gauge can distinguish surface echoes from bottom echoes. On the
other hand, if bottom echoes cannot be discerned in high reflection targets such as
water, the “Bottom Visible” parameter should be set at “Bottom Invisible” to eliminate
any bottom echo from dead-band (Zero Cut).
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