CAT.No.CBE007E-5

Multipath Ultrasonic Flowmeter for Liquid Measurement

Multipath Ultrasonic Flowmeters

Psonic-L4

Various fields of technical expertise
incorporated into one product: Psonic-L4
Electronics
technology

Calibration
technology

Mechanical designand processing
technology

Computational
fluid dynamics
technology

Sensortechnology

High accuracy±0.15%RD at actual flow calibration: best suited for custody transfer

Features

Simple structure, reliable, made-in-Japan
No moving parts, no pressure loss, no maintenance required
Approvals: TIIS, ATEX, KCs, and compliance with OIML R117-1
Smart appearance with no exposed cables

The parallel path system provides long-term stability and redundancy
Parallel path system allows long-term stability

4-path system provides redundancy

Small attenuation of ultrasonic waves allows strong signal
reception. Compared to the reflection method, ultrasonicwaves are less likely to be affected by risks such as dirt
inside the pipe.

To continue the measurement in case of sensor failure, the Psonic-L4 is capable ofsupplement processing. The possible downtime can be minimized.

Sensor

Supplementing process
in case of missing signal

SensorPath 1If measurement data from a certain
path is missing, flow measurement willcontinue by supplementing the signals
from the path in the symmetrical
position.
For example, the left figure shows thatthe measurement data from Path 4 ismissing. In this case, the data from
Path 1 will substitute the missing datafrom Path 4 to continue the measurement.

Path 2Path 3

Path 4※:

represents missing signal/measurement.

Measurement Principle

Sensor B

Traveling time fromSensor B to A (Tba)

Propagation time and flow velocity (flow rate)
Inverse propagation oftime difference
11TbaTabThe ultrasonic flowmeter measures the time of ultrasonic wave transmitted from one
sensor and received by the other. This time duration is called "propagation time."
When there is no flow, the propagation time from sensor A to sensor B (Tab) and the
propagation time from sensor B to sensor A (Tba) should be the same. However, once theTraveling time fromfluid is flowing, ultrasonic signal is affected by the flow, creating a difference between

Sensor A

propagation times Tab and Tba. The ultrasonic flowmeter measures propagation times Taband Tba, then calculates the flow velocity from the difference in propagation times, andprovides the flow rate by multiplying the flow velocity by the cross-section area of the pipe.

V=1

1Sensor A to B (Tba)

1（ Tab ー Tba ）2 cosθ

V: Flow velocity [m/s] L: Distance between sensors [m]θ: Angle between inner pipe axis and course of ultrasonic wave [°]Tab: Time for propagation from Sensor A to Sensor B [s]Tba: Time for propagation from Sensor B to Sensor A [s]∴Q=V×A×K Flow rate = Velocity × Cross-section Area × CoefficientNew flowmeter for custody transferof petroleum products

Extensive self-diagnostic functions
To achieve superior performance stability as a liquid flowmeter● Suitable for custody transfer application of petroleum products(especially for the measurement of petroleum products), the Psonic-L4 is● Capable of bi-directional measurement

equipped with extensive self-diagnostic functions.

● Bi-directional measurement simplifies pipeline layout: lower pipe

installation cost

Hardware failuredetection● No strainer required: reduces running cost

Transmitting circuit errorReceiving circuit error

High limit alarm

Low limit alarm

Measured value
soundness confirmation
notice
Upstream meter run
with flow straightener (HVL)

Upstream meter run
with flow straightener (HVL)

Direction A

Direction B

Sensor failure or
partially-filled pipedetection

No reception error

Zero-point adjustment
incomplete notification

Incomplete error

Flow velocity distribution
abnormality detection

Drift detection

Behavior during an error

ROM check error●●Swirl detection● Error indicator on LCD display
Status output
Specified value of pulse and analog output (HIGH, LOW, HOLD, NONE)High accuracy: ±0.15％RD
With its 4-path method, the Psonic-L4
Light crude 23cSt

achieved the accuracy of ±0.15%RD.

Jet fuel 1.6cSt

ISO/IEC17025 accredited facility
ensures the traceability required inMeter Error [%]Gasoline 0.6cSt

Conducting the calibration test atcustody transfer applications.
1×E＋04

1×E＋05

Reynolds Number

1×E＋06■ Under the condition where an upstream meter run with flow straightener (10D) anda downstream meter run (5D) are installed

Applications● Custody transfer for:– Offshore loading/off-loading– Pipelines– FPSO● Stockpile/shipment control at FSO● Strict control of production lines

For the measurement of costly liquids,"Maintenance-free"
is becoming an increasingly important aspect along with accuracy.

1×E＋07■ OIML R117-1
Evaluation Report

[General Specifications]
Item

Description
Oil, heavy oil, other liquids (Homogeneous liquids through which an ultrasonic wave propagates)

Applicable fluids

100, 150, 200, 250, 300mm

Nominal size

JIS10, 20, 30K RF, JPI150, 300 RF, ASME150, 300 RF

Process connection

SCS13A

Body material−20 to +60℃

Ambient temp. range−20 to +120℃

Fluid temp. range

Design pressure: 8MPa at 120℃ (vary with flange rating)Max. operating pressure

0.1 to 400mm2/s (0.1 to 400cSt)

Viscosity range−10 to +10m/s

Flow velocity range±0.15%RD

1) Calibration at the same Reynolds number as operating condition (High accuracy calibration) (w/ flow straightener and downstream pipe)±0.5%RD

2) Calibration without matching the Reynolds number to operating condition (Standard) (w/ flow straightener and downstream pipe)±1.0%RD

3) Only with single flowmeterFactory calibration
accuracy

Integrally mounted

Transmitter structure
Analog output

Insulated active output 4 to 20mA, Maximum load resistance: 600Ω, Accuracy: ±0.1% FS

Pulse output

Insulated open collector output (Max. 30VDC, 50mA, ON-voltage: 1.5V or less) 2 output or voltage pulse output (15V±5％) 2 output
Max. frequency: 10kHz

Status output

Insulated photo MOS relay output (Max. 30VDC, 50mA, ON-voltage: 1.5V or less)
Alarm output / reverse flow detection
Max. 1kmOutput transmission distance

85 to 240VAC 50/60Hz, 20 to 30VDC

Power supply

Max. 10W

Power consumption

IP66

IP rating[Flow Range][Approvals]
3Nominal size(mm)Min. measurable flow rate (m /h)Standard low cut (0.1m/s)

Min. flow rate
(m3/h)

Max. flow rate
(m3/h)

100

2.7

13270

150

6.0

30

600

200

10.0

50

1000

250

16.0

80

1600

300

23.0

110

2300

Explosionproof

TIIS: Transmitter terminal part: Ex d ⅡB T4Transmitter operation part: Ex d[ia] ⅡB T4Transducer part: Ex ia ⅡB T4
ATEX: Ⅱ1/2G Ex d iaⅡB T4 Ga/Gb
KCs: Ex d iaⅡB T4 Ga/Gb

Other standards

OIML R117-1: 2007
OIML D11: 2004
High Pressure Gas Safety Act (Japan)※ The minimum flow rate shall be either 0.5m/s or that at Re=8,000, whichever is the larger.
(The above-mentioned values represent the values at 0.5m/s)[Outline Dimensions](242)

Nominal size

100mm

B

150mm

200mm

250mm

A
300mm

FlangeJIS10K
JIS20K
JIS30K
ASME150/JPI150
ASME300/JPI300
JIS10K
JIS20K
JIS30K
ASME150/JPI150
ASME300/JPI300
JIS10K
JIS20K
JIS30K
ASME150/JPI150
ASME300/JPI300
JIS10K
JIS20K
JIS30K
ASME150/JPI150
ASME300/JPI300
JIS10K
JIS20KJIS30K
ASME150/JPI150
ASME300/JPI300

A (mm)B (mm)

450

411

490

436

540

462

590

487

650

513

Approx. weight (kg)
52
56
62
57
66
82
90
104
85
102
111
121
139
121
144
148
169
199
161
201
178
205
252
212258• The specification as of September, 2018 is stated in this catalog. Specifications and design are subject to change without notice.
• All content of this catalog is copyrighted by OVAL Corporation. Any reproduction of the content, in partial or in whole, without permission from OVAL is strictly prohibited.

3-10-8 Kamiochiai, Shinjuku-ku, Tokyo 161-8508, JapanTel. 81-3-3360-5121 Fax. 81-3-3365-8605

http://www.oval.co.jp/english
1405 1811 −−−− S