50489/GTEX Chem IIC/1805 UTImeter Gtex Chem IIC
6.5. Reading index
Zero ullage
Reference level of tank
Liquid level
Reaction point
100
200
300
400
500
600
700
800
900
1000
1100
1200
0
Figure 7-9
The tape reading at the height of the reading index
of the instrument is indicating the distance
between the reaction point and the reading index.
If the instrument is installed in such a way that the
reading index is at the same level as the zero-
ullage reference level the reading of the tape
corresponds to the ullage providing the reaction
point of the sensing probe is positioned at the
liquid level.
If the reading index is positioned below or above
the reference level a positive or negative
correction of the tape reading is necessary.
See also chapter 8 “Examples of installation of the
gauging system”.
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