CLAMP-ON TYPEUL350
ULTRASONIC FLOWMETEROUTLINE
Our clamp-on type Ultrasonic Flowmeter UL350 has enabled applications to piping in various kinds by enhancing the permeation
property of ultrasonic wave. “Time-Flight” type flowmeter is capableof measuring a flow rate of metallic and plastic piping ranging from25 to 1000 mm in nominal diameter.
A detector (an ultrasonic sensor) is mounted outside an existing
piping by clamping method, so that it does not get into contact
with the measuring fluid at all, and there are no concerns about themixture of solid material and metallic ion into the fluid, the corrosionof sensor by chemical, and the pressure loss by installing the flowmeter.

FEATURES❏ The sensor of ultrasonic flowmeter UL350 is clamped on justoutside of an existing pipe without any piping modification andtime consuming installation work.
❏ By adopting a DSP and an AD converters, the flow measurement
has been speeded up, and the resistance to bubbles has been
improved.
❏ Because of the noncontact measurement method, the formationof bubbles and the mixture of metallic ion have been completely
prevented.
❏ Installing the flowmeter does not cause the pressure loss
because of no obstacles in the measuring pipe.
❏ The ultrasonic flowmeter is not affected by the pressure or conductivity of fluids.
❏ Excellent in long-term stability because of no moving part.
❏ Providing the following functions: Forward/backward flow rate
display, totalizing display, analog output, pulse output, status
output.
❏ Capable of controlling the flow rate with digital data by RS-485
serial output. (Forward/backward flow rate output, totalizing
output, and status output by the Modbus protocol)❏ A multi-drop connecting method has greatly reduced the signalwire.
❏ Complied with RoHS. Applying for EMC standards.

MEASUREMENT PRINCIPLE

As shown in Fig. 1, an ultrasonic is transferred from A to B and B toA in turn with a angle of ψ. The required durations of transfer of two
directions are different when measuring medium is moving from up
stream to down stream. The durations of transfer are expressed bythe following formula.

BV BA

tAB = L / (Co + Vm COS ψ)tBA = L / (Co – Vm COS ψ)ΨV BAVmWhereL

L: Distance between A and B
Vm: Average velocity of medium
Co: Sonic speed in stable medium
tAB, tBA : Duration of transfer of Ultra Sonic from A to B and B to A

ABy measuring the difference of the transfer duration, the averagevelocity of medium can be calculated. The calculation is done bythe following formula:
ABFig. 1

2Vm cos ψ = L / tAB – L/tBA
ψ = L (tBA – tAB) / (tBA × tAB)
Vm = L (tBA – tAB) / (2cos ψ × tBA × tAB)
The distance between A and B (L) and the angle (ψ) are known, andthe average velocity is mathematically calculated.
TG-F2334-E00
1st edition Dec 2022 K

UL350 ULTRASONIC FLOWMETER

STANDARD SPECIFICATIONS● Measuring method: Ultrasonic time-flight type (Ultrasonic path:Reflex mode / V path or Diagonal mode /Z path)● Construction: Sensor, Converter, Exclusive coaxial cablewith BNC connector, sensor fixing rail
● Sensor mounting: Piping clamp-on type● Measuring fluid: Liquids in which Ultrasonic waves propagate*Refer to P5.[ POINTS TO BE CHECKED
BEFORE MODEL SELECTION ]● Measurable fluid sonic velocity range: 1,000 to 2,500 m/s● Measurable fluid kinematic viscosity range: 0.30 to 40.00 mm2/s● Fluid temperature: Up to 90°C (Surface temperature of piping)● Measurable pipe (Nominal diameter): 25 mm (min) to 1000 mm (max)Note: Refer to “POINTS TO BE CHECKED
BEFORE USING” when selecting
the specifications.
● Measurable flow velocity range: 0 to 10 m/s● Settable full scale flow velocity range: Maximum 10 m/s at settable full scale● Accuracy: ±2% of the reading at the condition thatflow velocity is 1m/s or more and Reynolds number is 10000 or more.
: Flow velocity error is ±2 cm/s at the condition that flow velocity is less than 1m/s.
● Display: 16-digit, 2-line alphanumeric LCD (withbacklight) and status display LEDs (3pieces)
Display data
: Flow rate, totalizing flow rate, variousstatus● Power supply: 100 to 230 V AC 50/60Hz ( 85 to 264 V AC50/60Hz is acceptable)● Power consumption : 12 VA or less
● Cable entry

2: For power/output (M20 x 1.5, 3 pieces);
With waterproof cable gland (Applicablecable diameter: ø8.0 to ø13.0)
For sensor; Waterproof BNC connector (2pieces)TOKYO KEISO CO., LTD.

● Outputs
1) Analog output : 4 to 20 mA DC, Load resistance: 500Ω or less2) Pulse output : Open collector output
Load rating 30 V DC, 50 mA, Low level 2V or lessPulse width: 0.5 ms (max.1000pps), 50 ms(max.10pps), 100 ms (max.5pps),
500 ms (max.1pps), 1s (0.5 pps orless): It is selected by the numberof the maximum setting pulses.
3) Status output : Open collector outputLoad rating 30 V DC, 50 mA, Low level 2 V orless
Status 1 : Hold output
Status 2 : Empty pipe detection
Status 3 : Forward or backward flow detection
4) Serial output : RS-485 serial output, Modbus protocol
Transmission speed/distance — 2,400, 4,800,9,600 or 19,200 PPS, 1.2 km (Max. total distance at the time of multi-drop connection)
Slave addresses: 1 to 31● Damping setting : 0 to 100 s (Settable in increments of 1s step)* Valid for display, analog output and pulse output.
There is a response delay of 0.5 s, even if damping is
set to 0 s.
● Low cutoff setting: 0 to 30% of the maximum flow rate
(Settable in increments of 1%)* Valid for display, analog output and pulse output.
● Parameter setting: Set with the key switches on the front
panel of converter.
● Other additional functions
1) Analog and pulse simulation output function (For loop check)2) Forward/backward direction measuring function● Converter mounting method: Mounted onto the wall or 2 inchpipe● Enclosure: Converter / IP65 Jet-proof,Sensor / IP65 Jet-proof (guaranteed withBNC connectors coupled)● Material: Sensor housing / Heat-resisting ABS
Sensor mounting rail / Aluminum
Converter housing / Heat-resisting ABS● Painting of converter : Housing cover = Blue
: Housing body = Light gray● Sensor ambient temperaure: -10 to 70°C
● Converter ambient temperature and humidity: -20 to 50°C, 10 to 90% RH (No dewcondensation)● Sensor signal cable : Standard 10 m (Up to 60 m)

TG-F2334-E00

UL350 ULTRASONIC FLOWMETER
Table 1. Sensor selection table
Nominal pipe size
Pipe material
Sensor type(D)25A≦D≦40A
PVC/Polyethylene（2MHz）
50A≦D≦150A A sensor
200A≦D≦300A
25A≦D≦150A
Stainless steel
A sensor（2MHz）
200A≦D≦400A（thickness≦sch40）
450A≦D≦1000A B sensor（1MHz）
25A≦D≦40A A sensor（2MHz）
50A≦D≦150A
SGP
B sensor（1MHz）
200A≦D≦1000A
25A≦D≦40A A sensor（2MHz）
SGPW
50A≦D≦150A（galvanize）
B sensor（1MHz）
200A≦D≦300A
25A≦D≦40A A sensor
PP（thickness≦（2MHz）
15mm）/50A≦D≦150A
PVDF（thickness≦
B sensor（1MHz）
200A≦D≦400A9mm）
25A≦D≦40A
PP（thickness＞15mm）/50A≦D≦150A B sensor（1MHz）
PVDF（thickness＞
200A≦D≦400A9mm）
25A≦D≦150A
PE（Polyethylene）
B sensor（1MHz）
200A≦D≦1000A
liningSensorinstallation

Z

Sensor rail
length320 × 1 pc
320 × 1 pc
620 × 1 pc
320 × 1 pc
620 × 1 pc
620 × 2 pc

V

320 × 1 pc

Z

620 × 2 pc

V

320 × 1 pc

Z

620 × 2 pc
320 × 1 pc
320 × 1 pc
620 × 2 pc
320 × 1 pc
320 × 2 pc
620 × 2 pc
320 × 1 pc
620 × 2 pc

VVVZVZVZ

Sensor rail
for support
320 × 1 pc
Not provided
Not provided

Not provided

Not provided
320 × 1 pc
Not provided
320 × 1 pc
Not provided
Not provided

Code of sensor
combination
15454455455415415454

Note 1 When the measuring pipes are sch.80 or more including stainless steel pipe, consult us in advance.
Note 2 V in the sensor installation column denotes V path, reﬂex mode and Z denotes Z path, diagonal mode.
Note 3 The sensor rail for support is used for the pipes made of resin with 40 mm or less.
Note 4 V path, reﬂex mode is generally used for the pipes with 400 mm or less. However, there are some cases where Z path,
diagonal mode is adequate depending on the pipe material or surface conditions of the pipe. If such situation is expected,
select the sensor rails with 2 pieces in advance.
Note 5 When the size of measuring pipes are unknown or especially expected to be more than 100 mm or more, select the longsensor rail with 2 pieces as the short sensor rails may not work well.
Note 6 See the MODEL CODE for the sensor combination.

TG-F2334-E00

TOKYO KEISO CO., LTD.

3UL350 ULTRASONIC FLOWMETERDIMENSIONSCONVERTER● Wall mount type● 2" pipe mount

(164)

94
2-Slotted hole ∅9×24×∅7160
140

UL350
23ZEROBACKMEAS.
SETUL350
STATUS 123ZERO
BACKMEAS.
SET210160140

STATUS 1

MENU
ENT.

MENU
ENT.

SENSORFLOW RATE RANGE/SIZE
Nominal diameter(mm)

UFS 330A Reﬂex mode
（V path）

2532
40
50
65
80
100
125
150
200
250
300
350
400500600
7008009001000

UFS 350B Diagonal mode
（Z path）[Note]

Possible scale range (m3/h)
Minimum
0.684
1.167
1.568
2.556
4.192
5.857
9.948
15.00
21.28
36.80
57.07
81.25
101.3
133.2
209.5
0.301 (km3/h)
0.409 (km3/h)
0.538 (km3/h)
0.684 (km3/h)
0.843 (km3/h)

Maximum
22.80
38.91
52.27
85.21
139.7
195.2
331.6
500.1
709.4
1226
1902
2708
3377
4442
6984
10.06 (km3/h)
13.66 (km3/h)
17.95 (km3/h)
22.82 (km3/h)
28.10 (km3/h)

The above-mentioned flow rates have been calculated for the SUS
Sch. 10s pipes, at the minimum range flow velocity of 0.3 m/s andmaximum range flow velocity of 10 m/s.
(The flow rate range may differ slightly, depending on the pipingstandard.)

WIRING DIAGRAM
CN1

CN2Power supply(AC)

AnalogExternal
Totalized
outputtotalization
ST1
4 to 20mADC pulse output
reset(3P)
L1(2P)
L2

CN3++–+TOKYO KEISO CO., LTD.

Serial Output
RS485(3P)(4P)–T−Note 1 :ST1 (Status 1) : Hold output
ST2 (Status 2) : Empty pipe detection
ST3 (Status 3) : Forward or backward flow detection
Note 2 :The detachable connectors are used.

4ST2 com ST3(2P)(2P)–Status output++com++–GND

TG-F2334-E00

UL350 ULTRASONIC FLOWMETERMODEL CODE
● SensorSensor Model codeAB
1Sensor combination
45UFS330
UFS350

Cable length

Additional functions

Description
A sensor (2 MHz)（✽）
B sensor (1 MHz)（✽）
Short sensor rail × 2 pcs,Sensor rail for support × 1 pc（✽）
Long sensor rail × 2 pcs（✽）
Short sensor rail × 2 pcs（ ✽）10 m (Standard)
120 m
230 m
340 m
450 m
560 m
6(Blank) NAProvided/Z✽ Refer to Table 1. Sensor selection table.
● ConverterConverter Model code
AUFC350A
Power supply
1Mounting2
Serial output

Description
100 to 230 V AC 50/60Hz
Wall mount type2“ pipe mount typeStandard

1-Additional functions(Blank) NA
Provided/Z

POINTS TO BE CHECKED BEFORE MODEL
SELECTION
It may be unable to make measurement when falling into the following conditions.
Contact us in advance. When it cannot be judged whether it is suitable, we are prepared to make preliminary test by the actual equipment.
1) Liquid● The liquid containing a lot of bubbles (over 2% only as aguide).
● The liquid containing slurry and solid material (over 5Vol.% onlyas a guide).
● The liquid of low Reynolds number (less than Re.10000 only asa guide).
● Liquids other than water such as lean chemical solutions, oils,2) Piping● The inside wall of carbon steel pipe is rusty.
● Adhesion and sediment are in a pipe.
● The outside surface of cast iron pipe is coarse.
● SGPW pipe [The galvanized steel pipe for water service (whitegas pipe)]● Lined pipe● Steel pipe in more than ø500 mm

waste waters and hot spring water.
● Liquids which attenuate Ultrasonic waves(Typical example:acetic acid)3) Straight runs
The accurate flow measurement requires straight runs both upstream and downstream of the flow sensor as shown at the next

*This flowmeter cannot be used for High concentration aceticpage.

acid aqueous solution (above 50%) .

TG-F2334-E00

TOKYO KEISO CO., LTD.

5

UL350 ULTRASONIC FLOWMETERREQUIRED STRAIGHT RUNS
D : Nominal diameter

Reference : JEMIMA standard JEMIS-32

Classification

Required downstream straight lengthL ≧ 5D

More than
10DL ≧ 10D

More than
10D90° bend

Required upstream straight lengthL ≧ 10D
L ≧ 50D

TeeMore than
10DL ≧ 5D

DExpansion pipe

More than
0.5D

L ≧ 30D

More than
1.5D
L ≧ 5DL ≧ 10D

ReducerL ≧ 30D

L ≧ 10D

Valve
Valve throttling at upstream pipe

Check valve

Valve throttling at downstream pipe

Slice valve
L ≧ 50D

Pump
P

PRECAUTION FOR USE
1) Pipe shall be always filled with fluid.
2) In the case of horizontal piping, please do not mount a sensor on the upper and the lower part of piping.
3) When you wrap a sensor in an insulating material, be careful not to exceed the ambient temperature limits of a sensor.
4) In order to prevent the sensor grease from degrading when installed outside, we recommend you to mount the waterproof cover which covers a sensor assembly.
* Specification is subject to change without notice.

Head Office : Shiba Toho Building, 1 – 7 – 24 Shibakoen, Minato-ku, Tokyo 105 – 8558
Tel : +81-3 – 3431 – 1625 (KEY) ; Fax : +81-3 – 3433 – 4922
e-mail : overseas.sales@tokyokeiso.co.jp ; URL : https://www.tokyokeiso.co.jp
6TG-F2334-E00