11 Operation via FOUNDATION Fieldbus Proline Prowirl 72 FOUNDATION Fieldbus
96 Endress + Hauser
Process Param. -
Mating Pipe
Diameter
AUTO - OOS The device is able to correct mismatches between inner diameter of
piping and inner diameter of the flowmeter. This functionality can be
activated by entering the actual diameter of the mating pipe in this
function (Fig. 32).
If the mating pipe (d1) and the measuring pipe (d2) have different
diameters, this alters the flow profile. A diameter jump can occur if:
• The mating pipe has a different pressure rating to that of the measuring
device.
• The mating pipe has another schedule to that of the measuring pipe
(e.g. 80 instead of 40), for ANSI.
• The mating pipe is made of another material, for DIN.
To correct any resulting shift in the calibration factor, enter the actual
value of the mating pipe (d1) in this function.
A0001982
Fig. 32: Mating pipe/measuring pipe
d1 > d2
d1 = Diameter of mating pipe
d2 = Diameter of measuring pipe
User input:
• Depends on the meter body type MB
• 5-digit floating-point number
Factory setting:
0
! Note!
• Inlet correction is switched off if 0 is entered in this function.
• The associated unit is displayed in the "Process Param. – Mating Pipe
Diameter Unit" function (Page 97).
• Only diameter jumps within the same nominal diameter class
(e.g. DN 50/2") can be corrected.
• If the internal diameter of the process mating flange is larger than the
internal diameter ot the Vortex flange, you must reckon with an
additional uncertainty of typically 0.1% (of the reading) per 1 mm
deviation.
• If the internal diameter of the process mating flange is smaller than the
internal diameter ot the Vortex flange, you must reckon with an
additional uncertainty of typically 0.2% (of the reading) per 1 mm
deviation.
• The diameter jump should only be corrected within the following limit
values (for which test measurements have also been performed).
Flange connection:
DN 15 (½"):
±20% of the internal diameter
DN 25 (1"):
±15% of the internal diameter
DN 40 (1½"):
±12% of the internal diameter
DN 50 (2"):
±10% of the internal diameter
Continued on next page
Transducer Block "Flow" (Endress+Hauser parameters) / base index 500
Parameter Write access for
operating mode
(MODE_BLK)
Description
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