6.3 Linearisation
Linearisation mode A linearisation describes the relationship between level and the tank volume or product
weight and allows a measurement in technical units, e.g. metres, hectolitre, tonnes etc.
Afterwards, the measured value is displayed in the selected units in V0H0 and the
analogue output is proportional to the volume or weight. The table below lists the
linearisation modes.
Warnings During entry of the table, an error message is generated and the device indicates an
alarm. After the curve has been entered, it is checked for plausibility. The following
warnings and alarms can appear.
De-activation A linearisation table can be deactivated by setting V2H0 = 0 (m/ft) or 5 (linear). It is not
deleted and can be re-activated at any time by setting V2H0 = 1.
The setting V2H0 = 4 deletes the entire table. The linearisation mode "linear" (V2H5 = 5)
is automatically selected.
Note!
•
The values in V2H5, V0H5 and V0H6 must be changed as necessary.
Note!
Entry
V2H0
Linearisation mode Significance
0
Level Linear display of level in m or ft.
2
Manual entry Max. 30 pairs of values, level and volume, are entered as the
linearisation curve.
3
Semi-automatic entry In the case of semi-automatic entry, the tank is filled in stages. The
device automatically displays the level, the associated volume is
entered manually.
5
Linear relationship Factory setting. The relationship between the technical units and
level is linear. By entering the max. volume or weight, the measured
value is output in the technical units chosen by the user.
In addition, V2H0 offers the functions:
1
Activate table The entered linearisation table only comes into effect after it has
been activated.
4
Delete table Before a new linearisation table is entered, any previously active
table must be deleted. On deletion the linearisation mode is
automatically set to linear.
Code Type Significance
E602 Warning The linearisation curve does not rise continuously.
The number of the last valid pair automatically appears in V2H1. All
value pairs from this number onwards must be re-entered.
E604 Warning The linearisation curve comprises less than two value pairs.
Enter more points.
E605 Alarm The manual linearisation table is incomplete
Disappears after activation of table.
Chapter 6 Calibration with Display/Remote Operation Micropilot FMR 231
28 Endress+Hauser
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