Endress+Hauser Levelflex FMP53 Operating Instructions Manual page 26

Mounting
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2. Parameter Expert → Sensor → Gas phase compensation → Const. GPC factor
 Quotient: Enter "(actual probe length)/(measured probe length)".
Compensation via the calibration parameters
If it is necessary to actually compensate for a gas phase, the gas phase compensation
function is not available for the correction of external mounting. The calibration
parameters (Empty calibration and Full calibration) must be adjusted in this case.
Furthermore, a value that is greater than the actual probe length must be entered in the
Present probe length parameter. In all three cases, the correction factor is the quotient of
the probe length measured when the vessel is empty and the actual probe LN.
The device searches for the probe end echo in the differential curve. Therefore, the
value of the measured probe length depends on the mapping curve. In order to obtain
a more accurate value, it is advisable to determine the measured probe length
manually using the envelope curve display in FieldCare.
1. Parameter Setup → Empty calibration
 Increase the parameter value by the factor "(measured probe length)/(actual
probe length)".
2. Parameter Setup → Full calibration
 Increase the parameter value by the factor "(measured probe length)/(actual
probe length)".
3. Parameter Setup → Advanced setup → Probe settings → Probe length correction
→ Confirm probe length
 Select the Manual input option.
4. Parameter Setup → Advanced setup → Probe settings → Probe length correction
→ Present probe length
 Enter the measured probe length.
Levelflex FMP53 PROFIBUS PA
Endress+Hauser