Vortex flow measuring system

Reliable flow measurement of gas, steam and liquids

Application
For the universal measurement of the volume flow
of gases, steam and liquids.
The mass flow of steam, water (as per IAPWS-IF97
ASME), natural gas (as per AGA NX-19/AGA8-DC92
detailed method/AGA8 Gross Method 1/SGERG-88),
compressed air, other gases and liquids can also be
calculated with the aid of integrated temperature
measurement and by reading in external pressure values
(Prowirl 73).

Maximum range of applications thanks to:
• Fluid temperature range from –200 to +400 °C
(–328 to +752 °F)
• Pressure ratings up to PN 250/Class 1500
• Sensor with integrated (optional) diameter reduction
by one line size (R Style) or two line sizes (S Style)
• Dualsens version (optional) for redundant
measurements with two sensors and electronics

Approvals for:
• ATEX, FM, CSA, TIIS, NEPSI, IEC
• HART, PROFIBUS PA, FOUNDATION Fieldbus
• Pressure Equipment Directive, SIL 2

Your benefits
The robust Prowirl sensor, tried and tested in over
200 000 applications, offers:
• High resistance to vibrations, temperature shocks,
contaminated fluids and water hammer
• No maintenance, no moving parts, no zero-point drift
("lifetime" calibration)
• Software initial settings save time and costs
Additional possibilities:
• Complete saturated steam or liquid-mass measuring
point in one single device
• Calculation of the mass flow from the measured
variables volume flow and temperature in the
integrated flow computer
• External pressure value read-in for superheated steam
and gas applications
• External temperature value read-in for delta heat
measurement

Performance characteristics
Reference operating
conditions
Error limits following ISO/DIN 11631:
• +20 to +30 °C (+68 to +86 °F)
• 2 to 4 bar (29 to 58 psi)
• 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 > 20000
< 0.75% o.f.s for Re between 4000 and 20000
• Gas/steam:
< 1% o.r. for Re > 20000 and v < 75 m/s (246 ft/s)
< 1% o.f.s for Re between 4000 and 20000
o.r. = of reading, o.f.s = of full scale value, Re = Reynolds number
Prowirl 73
• Volume flow (liquid):
< 0.75% o.r. for Re > 20000
< 0.75% o.f.s for Re between 4000 and 20000
• Volume flow (gas/steam):
< 1% o.r. for Re > 20000 and v < 75 m/s (246 ft/s)
< 1% o.f.s for Re between 4000 and 20000
• Temperature:
< 1°C / 1.8 °F (T > 100 °C / 212 °F, saturated steam and for liquids at ambient temperature);
< 1% o.r. [K] (gas)
Rise time 50% (agitated under water, following IEC 60751): 8 s
• Mass flow (saturated steam):
– For flow velocities 20 to 50 m/s (66 to 164 ft/s), T > 150 °C / 302 °F (423 K)
< 1.7% o.r. (2% o.r. for remote version) for Re > 20000
< 1.7% o.f.s (2% o.f.s for remote version) for Re between 4000 and 20000
– For flow velocities 10 to 70 m/s (33 to 230 ft/s), T > 140 °C / 284 °F (413 K)
< 2% o.r. (2.3% o.r. for remote version) for Re > 20000
< 2% o.f.s (2.3% o.f.s for remote version) for Re between 4000 and 20000