Mounting Levelflex FMP51, FMP52, FMP54 FOUNDATION Fieldbus
44 Endress+Hauser
Step Parameter Action
1 Expert → Sensor → Gas phase compensation → GPC
mode
Select the Const. GPC factor option.
2 Expert → Sensor → Gas phase compensation → Const.
GPC factor
Enter quotient: "(Actual probe length)/
(Measured probe length)".
Compensation via the calibration parameters
If an acutal gas phase has to be compensated for, the gas phase compensation
functionality is no longer available for a correction of the external mounting. In this case
the calibration parameters (Empty calibration and Full calibration) must be adjusted and
a value longer than the actual probe length has to be entered into the Present probe
length parameter. The correction factor for these three parameters is given by the
quotient of the probe length measured when the tank is empty and the acutal probe length
LN.
The device looks for the end of probe signal in the subtracted curve. Thus, the value of
the measured probe length depends on the mapping. In order to obtain an exact
value, it is advisable to determine the probe length manually using the envelope curve
display in FieldCare.
Step Parameter Action
1 Setup → Empty calibration Increase parameter value by "(Measured probe
length)/(Actual probe length)".
2 Setup → Full calibration Increase parameter value by "(Measured probe
length)/(Actual probe length)".
3 Setup → Advanced setup → Probe settings → Probe
length correction → Confirm probe length
Select the Manual input option.
4 Setup → Advanced setup → Probe settings → Probe
length correction → Present probe length
Enter measured probe length.
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