Proline Prowirl 72F, 72W, 73F, 73W
12 Endress+Hauser
Performance characteristics
Reference operating
conditions
Error limits following ISO/DIN 11631:
20...30 °C, 2...4 bar, calibration rig traceable to national calibration standards
Calibration with the process connection corresponding to the standard in question
Maximum measured error Prowirl 72
• Liquid:
< 0.75% o.r. for Re > 20,000
< 0.75% o.f.s for Re between 4,000...20,000
•Gas/steam:
< 1% o.r. for Re > 20,000
< 1% o.f.s for Re between 4,000...20,000
o.r. = of reading, o.f.s = of full scale value, Re = Reynolds number
Prowirl 73
• Liquid (volume flow):
< 0.75% o.r. for Re > 20,000
< 0.75% o.f.s for Re between 4,000...20,000
• Gas/steam (volume flow):
< 1% o.r. for Re > 20,000
< 1% o.f.s for Re between 4,000...20,000
• Temperature:
< 1 °C (T > 100 °C, saturated steam);
rise time 50% (agitated under water, following IEC 60751): 8 s
• Mass flow (saturated steam):
– For flow velocities 20...50 m/s, T > 150 °C (423 K)
< 1.7% o.r. (2% o.r. for remote version) for Re > 20,000
< 1.7% o.f.s (2% o.f.s for remote version) for Re between 4,000...20,000
– For flow velocities 10...70 m/s, T > 140 °C (413 K)
< 2% o.r. (2.3% o.r. for remote version) for Re > 20,000
< 2% o.f.s (2.3% o.f.s for remote version) for Re between 4,000...20,000
• Mass flow (other media):
– depending on the pressure value specified in the instrument functions and the chosen fluid
– individual error observation must be carried out
o.r. = of reading, o.f.s = of full scale value, Re = Reynolds number
Repeatability ±0.25% o.r. (of reading)
Reaction time/step response
time
If all the configurable functions for filter times (flow damping, display damping, current output time constant,
frequency output time constant, status output time constant) are set to 0, a reaction time/step response time
of 200 ms must be reckoned with for vortex frequencies as of 10 Hz.
For other settings, a reaction time/step response time of 100 ms must always be added to the total filter
reaction time for vortex frequencies as of 10 Hz.
Influence of ambiente tempe-
rature
Current output (additional error, in reference to the span of 16 mA):
• Zero point (4 mA):
average Tk: 0.05%/10 K, max. 0.6% over the entire temperature range –40 °C ... +80 °C
• Span (20 mA):
average Tk: 0.05%/10 K, max. 0.6% over the entire temperature range –40 °C ... +80 °C
Digital outputs (pulse output, PFM, HART, frequency output (Prowirl 73 only))
Due to the digital measuring signal (vortex pulse) and further digital processing, there is no interface-related
error from changing ambient temperature.
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