Description of device functions Proline Prowirl 73
140 Endress+Hauser
11.14 PROCESS PARAMETER
Function description, PROCESS PARAMETER group
D MATING PIPE Description
The device has diameter mismatch correction. This can be activated by entering the
actual value of the mating pipe (see Fig., d1) in this function.
If the mating pipe (d1) and the measuring pipe (d2) have different diameters, this alters
the flow profile. A diameter mismatch 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 device (e.g. 80 instead
of 40), for ANSI.
To correct any resulting shift in the calibration factor, enter the actual value of the mating
pipe (d1) in this function.
A0001982
d1 > d2
d1 = Mating pipe diameter
d2 = Measuring pipe diameter
• The inlet correction is switched off if 0 is entered in the function.
• The appropriate unit is taken from the UNIT LENGTH function (ä 106).
• Mismatches between diameters can only be corrected within the same nominal
diameter class
(e.g. DN 50/2").
• 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 mismatch should only be corrected within the limit values listed below
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
Wafer:
DN 15 (½"): ±15% of the internal diameter
DN 25 (1"): ±12% of the internal diameter
DN 40 (1½"): ±9% of the internal diameter
DN 50 ( 2"): ±8% of the internal diameter
User input
5-digit floating-point number
Factory setting
0
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