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Brand: Tokyo Keiso
Tokyo Keiso SONICMAX UL3400 3-Beam Inline Ultrasonic Flowmeter
Description
Three-beam inline ultrasonic flowmeter for liquids from DN25 to DN2000
The Tokyo Keiso SONICMAX UL3400 is an inline ultrasonic flowmeter with three pairs of ultrasonic sensors. Measuring along three beams, together with a digital signal processor, gives stable readings from laminar to turbulent flow and reduces the influence of bubbles and particles. Because the principle does not depend on density, viscosity or electrical conductivity, Tokyo Keiso positions it for oil, solvents and other liquids, including as a replacement for turbine or positive-displacement meters.
The meter has no moving parts and no maintenance items in the flow path. A flanged measuring tube is available in 25 mm to 2000 mm nominal sizes; larger sizes are available on request. Compact and separate (remote converter) versions exist, and explosion-proof types are offered with TIIS approval and ATEX certification.
Technical specifications
Data from Tokyo Keiso technical guidance TG-F2077-E04 (5th edition, March 2024).
| Parameter | Specification |
|---|---|
| Manufacturer / model | Tokyo Keiso SONICMAX UL3400 (compact UL3400C; separate ULS3000 sensor + ULC400F converter) |
| Measuring method | Time-of-flight ultrasound, 3 beams, inline |
| Nominal sizes | 25, 32, 40, 50, 65, 80, 100, 125, 150, 200, 250, 300, 350, 400, 500, 600, 700, 800, 900, 1000, 1200, 1400, 1600, 1800, 2000 mm |
| Flow velocity | Minimum range 0 to 0.3 m/s; maximum range 0 to 20 m/s |
| Accuracy | 0.3% of reading plus velocity error of 0.002 m/s (water, 20 °C, 10D upstream / 5D downstream); current output adds 0.01 mA |
| Process temperature | -45 to +140 °C compact; -45 to +180 °C separate; to +250 °C extended-temperature version; -200 to +180 °C cryogenic version |
| Pressure / viscosity | Up to 10 MPa per flange rating; kinematic viscosity up to 100 cSt |
| Process connection | Flanges: JIS 10K/20K, ASME class 150/300/600, EN 1092-1 PN6 to PN100 |
| Measuring tube | Sizes 25-65 mm SS316; 80-2000 mm carbon steel standard (SS316 optional) |
| Converter housing | Aluminium alloy (SS316 optional); IP66/67 |
| Power supply | 100 to 230 V AC (85 to 253 V) or 24 V DC (11 to 31 V); about 22 VA AC / 12 W DC |
| Display | Blue dot-matrix LCD, 128 x 64 pixels, backlit, 4 switchable screens |
| Outputs | 4-20 mA DC (load max 1 kohm); open-collector pulse to 10 kHz; status output; control input |
| Ambient temperature | -40 to +65 °C (aluminium converter); -40 to +60 °C (SS316 converter) |
| Explosion protection | TIIS: UL3400C-JEx; ATEX: KIWA 18ATEX0016X (UL3400C-Ex, ULS3000-Ex, ULC400F-Ex); marking II 2G Ex d [ia] IIC T6 to T3 Gb |
| Flow range examples | DN25: 0 to 0.531 / 35.3 m3/h; DN100: 8.49 / 565 m3/h; DN500: 213 / 14,137 m3/h; DN2000: 3,393 / 226,194 m3/h |
Ordering and selection notes
The model code builds a sensor specification code (nominal size, flange standard and rating, explosion-proof type, cable entry, tube and flange material) and a separate converter code. The catalogue example is a UL3400C compact meter with the two codes written out, and the order also needs the full-scale flow range, the converter display orientation (A, B or C) and the fluid name. Watertight cable glands for G1/2 and a third cable entry are listed as options, and a parameter sheet and instruction manual are standard.
Tokyo Keiso lists the conditions where an inline meter may be unsuitable: liquids with many bubbles (above about 2%), slurries or solids (above about 5 vol%) and strongly attenuating liquids such as acetic acid above 50%. When suitability is hard to judge, the company can arrange a preliminary test with a clamp-on flowmeter.
What to confirm before ordering
- Fluid, temperature and pressure, to select compact, separate, extended-temperature or cryogenic construction.
- Flange standard and rating, and tube and flange material for the line.
- Hazardous-area requirement: TIIS or ATEX, which changes the model code and the ambient limits.
- Required full-scale range inside the allowable velocity of 0.3 to 20 m/s.
How the Tokyo Keiso SONICMAX UL3400 works
Three pairs of sensors send ultrasonic pulses along three paths through the liquid. The pulses travel faster with the flow than against it. The converter measures the time difference on each path and turns it into a flow value.
Where the UL3400 is used
- Oil lines
- Solvent lines
- Process liquid lines
- Replacement of turbine meters
- Replacement of positive-displacement meters
Selection checklist for the UL3400
- Liquid type
- Pipe size
- Flow velocity
- Process temperature
- Process pressure
- Compact or separate version
- Flange type
- Output signals
Installation, commissioning and maintenance notes for the UL3400
Fit the flanged tube in the pipe with straight run before and after it. Connect the power and the output wiring. Set the pipe data in the converter. Check the zero flow reading with the line full. There are no maintenance items in the flow path.
Requesting a quotation for the Tokyo Keiso UL3400
Please send the liquid, the pipe size and the flow range. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.
UL3400 meter type
It is an inline ultrasonic flowmeter.
UL3400 beams
It has three pairs of ultrasonic sensors.
UL3400 flow profile
It gives stable readings from laminar to turbulent flow.
UL3400 bubbles and particles
Three beams reduce the effect of bubbles and particles.
UL3400 liquid properties
The principle does not depend on density, viscosity or conductivity.
UL3400 moving parts
It has no moving parts.
UL3400 sizes
Sizes run from 25 mm to 2000 mm.
UL3400 versions
Compact and separate versions are available.
UL3400 compact model
The compact model is the UL3400C.
UL3400 separate model
The separate version uses a ULS3000 sensor and a ULC400F converter.
UL3400 flow velocity
The maximum range is 0 to 20 m/s.
UL3400 compact temperature
The compact version works from minus 45 to plus 140 degrees C.
UL3400 separate temperature
The separate version works up to plus 180 degrees C.
UL3400 extended temperature
An extended-temperature version reaches plus 250 degrees C.
UL3400 pressure
Pressure goes up to 10 MPa, set by the flange rating.
UL3400 viscosity
Kinematic viscosity goes up to 100 cSt.
UL3400 small tube material
Sizes 25 to 65 mm use SS316.
UL3400 large tube material
Sizes 80 to 2000 mm use carbon steel as standard.
UL3400 converter housing
The housing is aluminium alloy with an IP66/67 rating.
UL3400 power supply
Supply is 100 to 230 V AC or 24 V DC.
UL3400 display
It has a backlit dot-matrix LCD.
UL3400 current output
It has a 4-20 mA DC output.
Meter records for the UL3400
Record the pipe data, the zero check and the service dates.
Choosing the right UL3400 version
Choose compact or separate from the site and the temperature.
Documents and quotation
The Tokyo Keiso UL3400 catalogue is hosted with this product, including the model code, flow range table and the TIIS and ATEX data. Send us the line size, flange, liquid, temperature range and approvals you need 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.
Datasheets & Documents
- Catalog Tokyo Keiso SONICMAX UL3400 3-Beam Ultrasonic Flowmeter catalogue (TG-F2077-E04, 5th edition Mar 2024) 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
How many ultrasonic beams does the UL3400 use?
Three pairs of ultrasonic sensors measure along three beams, which supports stable readings from laminar to turbulent flow.
What sizes are available?
Nominal sizes from 25 mm to 2000 mm; sizes over 2000 mm need to be discussed with Tokyo Keiso.
Is the UL3400 available for hazardous areas?
Yes. TIIS-approved UL3400C-JEx and ATEX-certified UL3400C-Ex, ULS3000-Ex and ULC400F-Ex versions are listed in the catalogue.
What accuracy is stated?
0.3% of reading plus 0.002 m/s under the catalogue reference conditions, with 0.01 mA added for the current output.
Does it depend on fluid conductivity?
No. The catalogue states it works independently of density, viscosity and electrical conductivity of the liquid.
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