Proline Prowirl 73 Technical data
Endress+Hauser 83
< 1.7% o.f.s (2.0% for remote version) for Re between 4000 and 20 000 and
process pressure < 40 bar abs (580 psi abs)
< 2.6% o.r. (2.9% o.r. for remote version) for Re > 20 000 and
process pressure < 120 bar abs (1740 psi abs)
< 2.6% o.f.s (2.9% o.r. for remote version) for Re between 4000 and 20 000 and
process pressure < 120 bar abs (1740 psi abs)
• Mass flow (water):
< 0.85% o.r. (1.15% o.r. for remote version) for Re > 20 000
< 0.85% o.f.s (1.15% o.f.s for remote version) for Re between 4000 and 20 000
• Mass flow (customer-defined liquids):
To specify the system accuracy, Endress+Hauser requires information on the type of liquid and its
operating temperature, or information in tabular form on the dependency between the liquid
density and temperature.
Example:
Acetone is to be measured at fluid temperatures between 70 and 90 °C. The parameters
TEMPERATURE VALUE (here 80 °C), DENSITY VALUE (here 720.00 kg/m3) and EXPANSION
COEFFICIENT (here 18.0298 × 10E-4 1/°C) have to be entered in the transmitter for this
purpose. The overall system uncertainty, which is smaller than 0.9% for the example cited above,
is made up of the following measuring uncertainties: Uncertainty of volume flow measurement,
uncertainty of temperature measurement, uncertainty of the density-temperature correlation
used (incl. the resulting uncertainty of density).
• Mass flow (other fluids):
Depends on the pressure value specified in the OPERATING PRESSURE function (ä 150). An
individual error observation must be carried out.
o.r. = of reading, o.f.s = of full scale value, Re = Reynolds number
Diameter mismatch correction
In the Prowirl 73 shifts in the calibration factor which are caused by a diameter mismatch between
the device and the mating pipe can be corrected (ä 140). 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
Repeatability ±0.25% o.r. (of reading)
Reaction time/
step response time
If all configurable functions are set to 0, you must reckon with a reaction time/step response time
of 200 ms for vortex frequencies as of 10 Hz. Other settings require a reaction time/step response
time of 100 ms to be added to the total filter reaction time for vortex frequencies as of 10 Hz.
• FLOW DAMPING ä 170
• DISPLAY DAMPING ä 114
• TIME CONSTANT (current output) ä 120
• TIME CONSTANT (status output) ä 134
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