Vortex Flow Meter Selection Guide for Liquid, Gas and Steam Applications
Vortex Flow Meter Selection Guide for Liquid, Gas and Steam Applications
A customer asks for a DN50 flow meter.
The obvious response might be to quote a DN50 meter, but that leaves out the most important part of the application. Is the pipeline carrying liquid, compressed gas or steam? What is the normal flow rate? What temperature does the meter see? Is there a control valve immediately before the meter? Does the reading need to go to a PLC?
These details matter even more with a Vortex Flow Meter, because the same line size has very different flow ranges depending on whether the medium is liquid or gas.
For example, the Radical TechArt vortex flow meter catalogue gives a DN50 liquid range of 3 to 60 m³/h, while the gas range for the same DN50 size is 35 to 380 m³/h.
So ordering by pipe size alone is not enough.
What Is a Vortex Flow Meter?
The Radical TechArt vortex flow meter is an inline flanged flow measuring instrument designed for gas, liquid and vapor service. The brochure covers line sizes from 25 mm to 200 mm, with a process temperature range from minus 40°C to 320°C and several industrial signal outputs.
The product image on page 9 shows a stainless steel inline meter body with flanged process connections and a separate elevated electronic display/transmitter assembly.
The catalogue identifies the sensing arrangement as piezoelectric type, with a listed vibrating acceleration value of 0.2g.
For context, vortex flow meters generally measure flow by detecting vortices produced in the flowing medium. The supplied brochure does not provide the complete measurement principle or internal sensor construction, so model-specific working details should be confirmed from the final datasheet.
For a buyer, the more useful question is whether the meter fits the actual medium, flow range, temperature, pressure and piping arrangement.
Why One Vortex Meter Can Be Considered for Different Media
One of the key features highlighted in the brochure is multi-fluid measurement.
The listed medium specification includes:
- Gas
- Liquid
- Vapor
The features section also refers to liquids, gases and steam.
This makes the vortex category worth considering when a plant has different flow measurement points across utilities and process systems.
But this does not mean one configuration should automatically be used everywhere.
A liquid line, compressed gas line and steam line can have very different:
- Flow ranges
- Temperatures
- Pressures
- Straight-pipe requirements
- Material requirements
- Output and totalizing requirements
The technology may support different media, but the application still has to be selected individually.
Radical TechArt Vortex Flow Meter: Key Specifications
The technical table on page 10 provides the main selection parameters.
| Parameter | Specification |
|---|---|
| Line size | 25 mm to 200 mm |
| Accuracy | ±1% to ±1.5% of reading |
| Environment temperature | minus 20°C to 55°C |
| Process temperature | minus 40°C to 320°C |
| Nominal pressure | 16 kg/cm² standard, 40 kg/cm² optional |
| Connection | Flange |
| Output | 4 to 20 mA, RS485, Pulse |
| Power supply | 24 V DC |
| Protection | IP65 |
| Medium | Gas, Liquid, Vapor |
| Sensing reference | Piezoelectric type |
| Vibrating acceleration | 0.2g |
| Range degree | 1:6 to 1:30 |
The features section also describes stainless steel body construction, low pressure drop, no moving parts and support for digital display with multiple outputs.
Flow Range Must Be Checked Against the Medium
This is one of the most important tables to check before requesting a vortex flow meter quotation.
| DN Size | Liquid Flow Range | Gas Flow Range |
|---|---|---|
| DN25 | 1.2 to 16 m³/h | 8 to 55 m³/h |
| DN32 | 1.8 to 20 m³/h | 10 to 120 m³/h |
| DN40 | 2 to 40 m³/h | 27 to 250 m³/h |
| DN50 | 3 to 60 m³/h | 35 to 380 m³/h |
| DN65 | 4 to 85 m³/h | 60 to 640 m³/h |
| DN80 | 6.5 to 130 m³/h | 86 to 1100 m³/h |
| DN100 | 15 to 220 m³/h | 133 to 1700 m³/h |
| DN125 | 20 to 350 m³/h | 150 to 2000 m³/h |
| DN150 | 30 to 450 m³/h | 347 to 4000 m³/h |
| DN200 | 45 to 800 m³/h | 560 to 8000 m³/h |
These are the liquid and gas ranges given in the catalogue.
Notice how different they are.
This is why a purchase inquiry should ideally include:
minimum flow + normal flow + maximum flow + medium + pipe size
not only pipe size.
The brochure does not provide a separate steam flow chart, even though steam is referenced in the features. Steam sizing should therefore be confirmed from the application data and final product datasheet.
Process Temperature Matters, Especially for Steam and Hot Utility Lines
The main technical table specifies a process range of minus 40°C to 320°C.
This broad range is one reason vortex measurement may be considered for hot process and utility applications.
The ordering-code graphic on page 11 also shows temperature options identified as T1, T2 and T3. The image appears to indicate up to 150°C, 250°C and approximately 330°C respectively, while the main technical specification states 320°C.
Because those two values are not identical, the maximum permitted process temperature should be confirmed for the exact ordered version.
Do not choose the temperature version from the normal process temperature alone. Consider startup, cleaning, steam conditions and maximum expected process temperature.
4 to 20 mA, Pulse or RS485: Decide Before Ordering
The meter supports 4 to 20 mA, pulse and RS485 outputs.
4 to 20 mA
Choose this when the instantaneous flow reading needs to go to a PLC, controller, recorder or SCADA analog input.
Pulse Output
Pulse output is useful when the requirement involves flow counting or totalization using compatible PLC inputs, counters or monitoring equipment.
RS485
RS485 can support digital communication with an automation system.
Do not assume that RS485 alone guarantees communication with every PLC or SCADA system. Confirm the protocol, register map, baud rate and device configuration before ordering.
The meter uses a 24 V DC power supply, which is also convenient for many industrial control panels.
Installation Can Affect a Good Meter More Than Buyers Expect
Page 10 of the brochure dedicates a complete diagram to installation guidelines.
It shows different straight-pipe requirements for situations involving:
- Normal straight pipeline
- 90 degree elbow
- Concentric contraction
- Concentric expansion
- Two elbows in the same plane
- Two elbows in different planes
- Fully open valve
- Partially open valve
The diagram shows that the required upstream straight run changes significantly depending on what is located before the flow meter.
This is important.
A DN100 meter installed immediately after a disturbed piping section is not the same installation as a DN100 meter installed in a proper straight run.
The lower installation diagrams on page 10 also show correct and incorrect meter positions where gas bubbles or incomplete pipe filling may affect liquid measurement.
In practical terms, check the piping layout before selecting the installation location, not after the flow meter reaches the site.
Why No Moving Parts Matters for Maintenance
The features section lists No Moving Parts as one of the advantages of the vortex flow meter. It also describes the design as maintenance-friendly and lists low pressure drop.
For maintenance teams, fewer mechanical measurement components can reduce the type of wear associated with meters that depend on continuously rotating internal elements.
That does not mean every application becomes maintenance-free.
The installation still needs:
- Correct piping arrangement
- Suitable process conditions
- Correct electrical wiring
- Protection from excessive vibration
- Inspection according to the plant maintenance schedule
The brochure itself specifies vibration performance information, so site vibration should not be ignored during selection.
Common Mistakes to Avoid
| Common mistake | Better approach |
|---|---|
| Ordering from pipe size only | Confirm medium and actual flow range |
| Using liquid range for gas selection | Use the correct medium-specific flow chart |
| Assuming steam uses the gas chart without confirmation | Ask for application sizing for steam |
| Ignoring process temperature | Select the correct temperature configuration |
| Installing immediately after an elbow or valve | Follow the installation straight-run guidance |
| Ignoring site vibration | Check vibration conditions at the mounting point |
| Selecting output after installation | Decide 4 to 20 mA, pulse or RS485 before ordering |
| Assuming RS485 means automatic PLC compatibility | Confirm communication protocol |
| Selecting only on price | Compare flow range, media, pressure, temperature and installation |
Do This, Not That
| Do This | Not This |
|---|---|
| Tell the supplier whether the medium is liquid, gas or steam | Ask only for a DN50 vortex meter |
| Provide minimum, normal and maximum flow | Give only maximum flow |
| Check piping before finalizing installation | Fit the meter wherever flange space is available |
| Confirm 24 V DC supply | Assume the field power is suitable |
| Select the output according to PLC requirements | Assume every output works with every panel |
| Confirm steam sizing separately | Assume steam and gas sizing are identical |
Quick Vortex Flow Meter Selection Checklist
Before requesting pricing, collect these details:
- Medium: liquid, gas, vapor or steam
- Exact medium name
- Pipe size
- Minimum flow rate
- Normal flow rate
- Maximum flow rate
- Normal and maximum temperature
- Operating and maximum pressure
- Required flange and pressure rating
- Required output: 4 to 20 mA, pulse or RS485
- Available 24 V DC power supply
- PLC, SCADA or totalizer requirement
- Available upstream and downstream straight pipe
- Nearby elbows, reducers or valves
- Site vibration conditions
These details make flow meter selection much faster and reduce the chance of buying a meter that physically fits the pipe but does not suit the process.
Specifications to Confirm Before Purchase
Before finalizing the vortex flow meter, confirm:
- Exact process medium
- Steam sizing data, where applicable
- Required operating flow range
- Exact accuracy for the selected medium
- Temperature version
- Maximum allowable process pressure
- Flange standard and rating
- Body and wetted material
- RS485 communication protocol
- Pulse output details
- 4 to 20 mA scaling
- Local display functions
- Totalizer requirement
- Installation straight length
- Maximum allowable vibration
- Calibration certificate requirement
- IP requirement
- Hazardous area requirement, if applicable
The supplied PDF does not specify all of these points, so they should be confirmed from the final product datasheet or quotation.
Why Buy a Vortex Flow Meter from Radical TechMart?
A vortex meter inquiry becomes much easier when the supplier understands what is actually happening in the process.
At Radical TechMart, the selection can be approached around the medium, flow range, temperature, pressure, piping layout and automation requirement rather than simply matching the existing pipeline diameter.
That is particularly useful for factories, utilities, OEMs, EPC contractors, system integrators and maintenance teams that need the flow signal connected to a PLC, SCADA system, totalizer or plant monitoring network.
Final Thoughts
A Vortex Flow Meter is worth considering when the application involves liquid, gas or steam flow and the process falls within the meter's operating range.
For the Radical TechArt range in the supplied PDF, the key points are DN25 to DN200 sizing, separate liquid and gas flow ranges, process temperatures up to the range stated in the selected configuration, 16 kg/cm² standard pressure with a 40 kg/cm² option, 24 V DC supply, IP65 protection and 4 to 20 mA, pulse and RS485 outputs.
But the most important part of vortex meter selection happens before the quotation.
Know what is flowing, how much is flowing and what the piping looks like around the meter.
FAQs
1. What can a vortex flow meter measure?
The supplied Radical TechArt brochure lists the medium as gas, liquid and vapor, while its features also refer to steam applications.
2. What line sizes are available?
The listed range is DN25 to DN200.
3. What is the accuracy of the vortex flow meter?
The technical specification gives ±1% to ±1.5% of reading. The features page also states accuracy up to ±1.5% of reading.
4. What outputs are available?
The meter supports 4 to 20 mA, pulse and RS485 outputs.
5. Can a vortex flow meter connect to PLC or SCADA?
The available outputs can support automation integration. For RS485, confirm the exact communication protocol and register information before final selection.
6. What is the process temperature range?
The main specification table lists minus 40°C to 320°C. Because the ordering section shows separate temperature versions, confirm the selected configuration before purchase.
7. Is the same flow range used for liquid and gas?
No. The catalogue provides separate liquid and gas flow ranges for every line size. For example, DN50 is listed at 3 to 60 m³/h for liquid and 35 to 380 m³/h for gas.
8. What information is required for vortex flow meter pricing?
Provide medium, pipe size, minimum and maximum flow, temperature, pressure, connection, output requirement and piping layout. For steam, provide the actual steam process conditions so the correct sizing can be confirmed.
