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Brand: Tokyo Keiso
Tokyo Keiso VFM4200 SWIRLMAX Vortex Flowmeter
Description
Two-wire vortex flowmeter with built-in temperature and optional pressure correction
The Tokyo Keiso VFM4200 SWIRLMAX is a 2-wire, all-in-one vortex flowmeter for steam, gases and liquids. Its vortex detector carries a Pt1000 temperature sensor, and the amplifier stores a saturated-steam density table, so mass flow of saturated steam can be calculated from temperature alone. An optional integrated pressure sensor extends the correction to superheated steam and gases, which removes the need for separate pressure and temperature transmitters and a flow corrector in steam and compressed-gas energy management.
The meter is built from welded 316L stainless steel with no moving parts. Tokyo Keiso’s advanced vortex frequency detection (AVFD) filters external disturbances for a stable reading, and flange-type meters can be ordered with a reduced bore of up to two steps below the line size for low flows.
Technical specifications
Data from Tokyo Keiso technical guidance TG-F2003-E03 (4th edition, July 2022).
| Parameter | Specification |
|---|---|
| Manufacturer / model | Tokyo Keiso SWIRLMAX VFM4200 (compact VFM4200C; remote type available) |
| Meter size | Flange type 15, 25, 40, 50, 80, 100, 150, 200, 250, 300 mm; wafer type 15, 25, 40, 50, 80, 100 mm |
| Measured fluid | Gas, steam and liquid; viscosity up to 10 mPa.s; Reynolds number 10,000 or higher |
| Process temperature / pressure | -40 to +240 °C; up to flange rating (maximum 10 MPa) |
| Process connection | Flange (JIS 10K/20K, ASME class 150/300/600) or wafer |
| Wetted material | Stainless steel 316L (metering tube, flange, vortex detector, detector gasket) |
| Temperature sensor / pressure sensor | Pt1000 RTD built in as standard; pressure sensor integrated as an option (0.1 to 10 MPa codes, with or without valve) |
| Accuracy, standard | Re 20,000 or higher: 0.75% of reading (liquid), 1% (gas, steam); Re 10,000 to 20,000: 2% |
| Accuracy, corrected | Gas and steam corrected for temperature and pressure: 1.5% (Re 20,000 or higher), 2.5% (below) |
| Repeatability | 0.1% |
| Output | 2-wire 4-20 mA DC; selectable pulse, frequency, status or limit switch (open collector or NAMUR); HART 7 standard |
| Power supply | 24 V DC (12 to 36 V DC) |
| Enclosure / ambient | IP66/67; -40 to +85 °C |
| Display | LCD, 2 screens of up to 3 lines: flow rate, total, temperature, velocity, vortex frequency, pressure (optional) |
| Explosion protection | JPN, ATEX and IECEx intrinsically safe, flameproof and dust variants (certificates CML 20JPN1032X, KIWA 18ATEX0032X and 18ATEX0034X, IECEx KIWA 19.0023X) |
| Water range examples | DN15: 0.91 to 5.04 m3/h; DN50: 3.54 to 49.2 m3/h; DN100: 13.4 to 185 m3/h; DN300: 128 to 1,772 m3/h |
Steam, gas and liquid sizing
The catalogue gives minimum and maximum velocity rules by fluid: for liquids a lower limit that is the largest of a density-based term, the velocity at Re 10,000 and 0.3 m/s, and for gas and steam the largest of a density-based term, the velocity at Re 10,000 and 2 m/s (3 m/s in the 15 mm size), with upper limits of up to 10 m/s for liquid and up to 80 m/s for gas and steam (45 m/s for 15 mm, 70 m/s for 25 mm). It then tabulates measurable ranges for water at 20 °C and for air at several pressures, so you can check the size against your actual flow before choosing a reduced-bore flange meter.
Burnout can be set to either 22 mA or 3.55 mA, the damping time constant runs from 0 to 100 s, and test functions simulate the current and contact outputs.
Ordering notes
The order carries a model and specification code (for example the catalogue shows a VFM4200 flange-type code), the full-scale flow rate unless the NS option is chosen, the converter mounting direction (version A, B, C or D), and the fluid name, temperature, pressure, density and viscosity. G1/2 watertight cable glands are an option, and by default the meter is delivered with standard settings that must be adapted to your range. Please confirm whether a pressure sensor is needed, because it determines whether superheated steam and gas can be corrected.
Where the VFM4200 vortex flowmeter is used
- Saturated steam lines
- Superheated steam lines
- Compressed air and gas lines
- Liquid process lines
- Steam energy management
Selection checklist for the VFM4200 vortex flowmeter
- Fluid type
- Line size
- Flange or wafer body
- Process temperature
- Process pressure
- Pressure sensor option
- Compact or remote type
- Output type
Installation, commissioning and maintenance notes for the VFM4200 vortex flowmeter
Mount the meter in a straight pipe run with the flow arrow in line with the flow. Wire the two-wire loop and enter the fluid data. Check the display and the output at regular intervals.
Requesting a quotation for the VFM4200 vortex flowmeter
Please send the fluid, the line size, the flow range, the pressure and the temperature. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.
VFM4200 meter type
It is an all-in-one vortex flowmeter.
VFM4200 maker
It is made by Tokyo Keiso under the name SWIRLMAX.
VFM4200 wiring
It is a two-wire instrument.
VFM4200 fluids
It measures steam, gases and liquids.
VFM4200 temperature sensor
A Pt1000 temperature sensor sits in the vortex detector.
VFM4200 steam table
The amplifier stores a saturated steam density table.
VFM4200 saturated steam
Mass flow of saturated steam is calculated from temperature alone.
VFM4200 pressure sensor
An integrated pressure sensor is an option.
VFM4200 superheated steam
The pressure option extends the correction to superheated steam and gases.
VFM4200 separate transmitters
It removes the need for separate pressure and temperature transmitters.
VFM4200 body material
The body is welded 316L stainless steel.
VFM4200 moving parts
The meter has no moving parts.
VFM4200 frequency detection
Advanced vortex frequency detection filters external disturbances.
VFM4200 reduced bore
Flange meters can be ordered with a bore up to two steps below line size.
VFM4200 flange sizes
Flange sizes run from 15 mm to 300 mm.
VFM4200 wafer sizes
Wafer sizes run from 15 mm to 100 mm.
VFM4200 process temperature
The process temperature runs from minus 40 to plus 240 degrees C.
VFM4200 process pressure
Pressure is limited by the flange rating up to 10 MPa.
VFM4200 viscosity
Liquid viscosity can be up to 10 mPa.s.
VFM4200 outputs
The output is 4 to 20 mA with a selectable pulse, frequency or status signal.
VFM4200 HART
HART 7 communication is standard.
VFM4200 power supply
The supply is 24 V DC.
VFM4200 ambient temperature
Ambient temperature runs from minus 40 to plus 85 degrees C.
VFM4200 display
The LCD shows two screens of up to three lines.
VFM4200 remote type
A remote type is available besides the compact VFM4200C.
Flowmeter records for the VFM4200
Record the fluid, the line size and the date of each inspection.
Choosing the right VFM4200 configuration
Choose the body type and the pressure option from the fluid and the line conditions.
Documents and quotation
The Tokyo Keiso VFM4200 catalogue is attached to this page as a PDF with flow range tables, the model code and explosion-proof data. Send us the fluid, line size, pressure, temperature and approvals needed and we will quote against the catalogue codes. Seven Star LLC is an independent supplier in Muscat; price and lead time are confirmed per RFQ. Related range: flowmeters, including the ABB VortexMaster FSV430.
Datasheets & Documents
- Catalog Tokyo Keiso SWIRLMAX VFM4200 Vortex Flowmeter catalogue (TG-F2003-E03, 4th edition Jul 2022) Download
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About brand
Tokyo Keiso is a Japanese manufacturer of flow and level instruments, founded in Tokyo in 1954 as Japan's first maker of variable-area flowmeters. It now builds ultrasonic, Coriolis, electromagnetic and variable-area flowmeters plus level gauges, and set up a production subsidiary in Korea in 2012 for non-contact ultrasonic flowmeters.
Seven Star LLC is an independent supplier in Muscat. We list Tokyo Keiso models from the maker's published technical documents for water, oil and gas, power and chemical plants in Oman and the GCC.
Tokyo Keiso company profile
| Founded | 1954, Tokyo, Japan |
|---|---|
| First products | Variable-area flowmeters, a first for a Japanese manufacturer |
| Headquarters | Tokyo, Japan |
| Leadership | Ryoichi Sugi, President |
| Product families | SONICMAX inline and clamp-on ultrasonic flowmeters (UL3400, UL6300, UL350), MASSMAX Coriolis mass flowmeters, electromagnetic and variable-area flowmeters, float and magnetic level gauges |
Milestones
- 1954: Tokyo Keiso is founded as Japan's first variable-area flowmeter maker.
- 2012: TK Flow Engineering is set up in Korea for ultrasonic flowmeter production.
Tokyo Keiso product series
Ultrasonic flowmeters include the UL350 and SONICMAX UL6300 V2 clamp-on meters and the SONICMAX UL3400 three-beam inline meter. Other flowmeters include the MASSMAX 2400R Coriolis mass flowmeter, the VFM4200 SWIRLMAX vortex meter, the MAGMAX EGM2100C compact electromagnetic flowmeter, the TH series thermal gas flowmeters and the VC series V-Cone differential pressure flowmeter.
Level instruments include the TLR7500 80 GHz microwave level meter, the TGF7200 guided radar, the FM4000 MAG GAUGE magnetic metal tube level gauge and the FW-9000NN servo balance tank gauge for storage tanks.
Where Tokyo Keiso instruments are used
Water and wastewater networks, chemical and petrochemical plants, oil and gas facilities, power stations and tank terminals, with outputs such as 4-20 mA, pulse and digital communication for connection to control systems.
Tokyo Keiso products we list
Ordering Tokyo Keiso instruments: what we need
Send the fluid, line size, flow or level range, pressure and temperature, process connection and materials, output signals and any hazardous-area option. Where a catalogue is older or an option is still in preparation, we say so on the product page.
Facts checked against Tokyo Keiso company profiles and a 2022 interview with its president, October 2026.
Browse Tokyo Keiso products by category: Flowmeters, Level Instrumentation.
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Frequently Asked Questions
Can the VFM4200 measure steam?
Yes. Saturated steam is corrected by temperature as standard; superheated steam and gas need the optional pressure sensor.
What is the output?
A 2-wire 4-20 mA signal with selectable pulse, frequency, status or limit-switch contact output, and HART 7.
What sizes are available?
Flange type from 15 to 300 mm and wafer type from 15 to 100 mm.
What is the accuracy?
0.75% of reading for liquid and 1% for gas and steam at Reynolds number 20,000 or higher.
Is it available for hazardous areas?
The catalogue lists Japanese, ATEX and IECEx intrinsically safe, flameproof and dust-protection versions.
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