Cannot find diaphragm surface for this actuator and nominal travel.

Cannot find diaphragm area for this actuator and nominal travel.

This message appears when the program does not find a diaphragm area in the database during calculation of a SAMSON actuator type for the combination of the selected nominal travel of the valve (Valve data part 1) and the selected actuator type.

In this case, further calculation is carried out as for a non-SAMSON type (see Calculate actuator).