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Endress and Hauser Vortex Flow Meter Prowirl Series: Multivariable Steam and Gas Measurement
Quick Answer
The Endress and Hauser Prowirl Series is a multivariable vortex flow meter for steam and gas measurement. It measures volume flow and temperature. With an external pressure transmitter, it calculates steam mass flow or gas corrected volume. Silver Instruments supplies a similar multivariable vortex flow meter for DN15 to DN300 lines and can help you replace a Prowirl F 200, 72F, 73F, or 77F with the same 4-20 mA HART output.
What the Prowirl Series Actually Measures
Prowirl meters use vortex shedding behind a bluff body. The sensor reads the vortex frequency and converts it to volumetric flow. In the multivariable version, the meter also reads process temperature from an integrated sensor. A separate pressure transmitter sends a 4-20 mA HART signal to the Prowirl. The electronics then calculate density, mass flow, or corrected gas volume.
Here is the thing. A plain vortex meter gives you actual volume only. A multivariable meter gives you a number you can use for steam tracking, boiler efficiency, gas consumption, or departmental cost allocation.
Steam Measurement: Saturated, Superheated, and Wet Steam
For saturated steam, the integrated temperature sensor helps the Prowirl identify steam density from stored steam table data. For superheated steam, the external pressure input is needed because temperature alone is not enough. The meter computes mass flow in kg/h or lb/h. Most plants in Southeast Asia and Latin America run saturated steam at 6 to 12 bar. We see this range often on boiler house headers and jacketed reactor lines.
Wet steam is different. The Prowirl Series can include wet steam detection in some versions. The meter compares the measured mass flow with the expected vortex signal and flags low steam quality. In practice, wet steam in a food processing plant often comes from a poorly drained distribution line. That condition reduces heat transfer and erodes control valves.
Last year a customer in Vietnam asked us to check a Prowirl F 200 installed on a saturated steam header at 8 bar. The meter reading was unstable and about 7 percent high. The root cause was a missing condensate drain upstream. It was not the meter itself.
Gas Measurement With Compensation
On gas lines, the Prowirl Series can output normal or standard volume flow. This is useful for compressed air, natural gas, nitrogen, and carbon dioxide. The meter uses the internal temperature sensor and external pressure transmitter to convert actual volume to corrected volume. Without compensation, a 10 degree temperature change or a 0.5 bar pressure swing can create a 3 to 5 percent error in gas flow totals.
Many engineers skip this part because the plant air header already has a pressure gauge. But a gauge does not feed the flow meter. You need a 4-20 mA pressure transmitter wired to the Prowirl or to a flow computer. Silver Instruments can supply the pressure transmitter and the multivariable vortex meter as one package.
Common Prowirl Series Model Lineup
The current Endress and Hauser Prowirl platform is the Prowirl 200 family. You will often see a nameplate code that starts with 7F2 on Prowirl 200 devices. Older installations still use the Prowirl 72F, 73F, and 77F series. The older meters are reliable but spare electron
Silver Instruments often replaces Prowirl 72F and Prowirl 77F units with a multivariable vortex flow meter that matches the same DN and flange standard. The output can be 4-20 mA HART or RS485 Modbus. The meter body is 316L stainless steel. The display shows mass flow, temperature, and totalizer.
Where Silver Instruments Fits
We are not Endress and Hauser. But we supply a multivariable vortex flow meter for steam and gas measurement at a lower cost and with faster delivery to customers in Australia, Southeast Asia, the Middle East, Latin America, and Africa. Our vortex flow meter covers DN15 to DN300, process temperatures from -40 to 350 °C in standard versions, and outputs 4-20 mA HART with pulse or Modbus options.
We also supply Coriolis mass flow meters, electromagnetic flow meters, ultrasonic flow meters, and thermal mass flow meters for other process measurement loops. But for Prowirl replacement on steam and gas lines, the multivariable vortex meter is the direct fit.
If you have a Prowirl F 200 on a 100 mm steam line at 10 bar, send us the flow range in kg/h and the process temperature. We will recommend a direct replacement with the correct K-factor and face-to-face length.
FAQ: Prowirl Series Steam and Gas Meter Questions
Can the Prowirl Series measure superheated steam mass flow without a flow computer?
Yes. The multivariable version uses an integrated temperature sensor and an external pressure transmitter. It calculates density inside the electronics and outputs mass flow. For superheated steam, pressure compensation is not optional.
What is the difference between Prowirl 72F, 73F, 77F, and Prowirl 200?
Prowirl 200 is the current generation with integrated temperature measurement, wet steam detection, and 4-20 mA HART. The 72F, 73F, and 77F are older single variable or dual sensor platforms. Replacement requires matching K-factor and face-to-face length.
Does Silver Instruments offer a lower cost replacement for Prowirl F 200?
Yes. We supply a multivariable vortex flow meter for steam and gas. It covers DN15 to DN300. It gives you 4-20 mA HART output, built in temperature compensation, and RS485 Modbus as an option. Send us a photo of the nameplate and process data.
What process data do I need to send for sizing?
Send us the pipe size (DN), schedule or wall thickness, fluid, operating pressure (bar), temperature (°C), and flow range in kg/h or m3/h. Also include the flange standard and the face-to-face length if you are replacing an existing meter.
Can I use the same pressure transmitter for gas and steam measurement?
Yes, in most cases. Use a pressure transmitter with 4-20 mA HART output and set the range to your operating pressure. The Prowirl or the Silver Instruments multivariable meter can read that signal and compensate flow. You do not need a separate flow computer for standard applications.
Contact and Sizing Check
Send us your steam pressure (bar), temperature (°C), pipe size (DN), and flow range. We will reply with a model recommendation, price, and lead time. Tel: +86-25-68650347 | WhatsApp: +86-25-52155837 | WeChat: +86 15365082610 | Website: flow-meter.com.au
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