Dynasonics UFX Manuel utilisateur

MODEL UFX

ULTRASONIC FLOW METER

Operating Instructions

TABLE OF CONTENTS

• Quick Start Instructions 4-5

• Introduction 6

• Specifications 6

• Controls and Terminology 7

• Transducer Mounting Locations 8

• Mounting the Transducer 9

• Operating the UFX 10

• Velocity to Volume Conversions 11

• Battery Replacement 11

• Troubleshooting Guide 12

• Velocity Conversion Chart 13

• Warranty 14

• Spare Parts and Accessories 15

• Service Instructions 15

QUICK-START INSTRUCTIONS

This manual contains detailed operating instructions for the UFX instrument.

The following condensed instructions are provided to assist an experienced

operator in basic operation of the instrument. If the operator is unfamiliar with

this type of instrument, refer to the detailed explanations located at the corre-

sponding letter on pages 8-11.

A. Select a transducer mounting location at least 10 pipe

diameters downstream and 5 diameters upstream of

flow disturbances (i.e. elbows, tees, valves, etc.).

B. On horizontal pipe, choose a

transducer mounting location ap-

proximately 90 degrees from the

top of the pipe.

C. Remove rust, scale and paint

from the transducer mounting lo-

cation. Clean to bare metal.

Plastic pipes do not require

preparation.

D. Plug the transducer plug into

the transducer jack.

STEP A

STEP B

STEP D

YES YES

E. Apply approximately 1/8th

inch [3 mm] silicone

grease to the transducer

face. Place the trans-

ducer face on the pre-

pared area of pipe. Hold

the transducer parallel to

the pipe with the cable

pointing downstream of

the flow direction.

F. Press the ON/OFF key.

Wait at least 30 seconds

before recording a read-

ing. The UFX will auto-

matically turn itself off af-

ter 3 minutes.

G. Change units of measure

by pressing the FT/SEC -

M/SEC key.

STEP E

STEP F

INTRODUCTION AND OPERATING THEORY

Series UFX Phase Shift Flow Meters feature advanced Trans-Phase

measuring technology, providing accurate and reliable flow velocity as-

sessments in closed piping systems. The UFX utilizes a non-invasive

transducer which is hand-held or strapped to the outside of a pipe.

Within seconds, the large 0.7 inch [18mm] LCD provides stable read-

ings in either FPS (Feet per Second) or MPS (Meters per Second).

This product is designed to operate on metal, plastic or rubber pipes

containing liquids with greater than 100 ppm of suspended solids or

entrained gases that act as reflectors.

Phase Shift flow meters utilize two piezoelectric crystals contained

within one transducer to transmit ultrasonic sound energy into the fluid

stream and receive reflected

sound from reflectors (suspended

solids or entrained gases) within

the liquid. See Figure 1. In ac-

cordance with the theories of

Christian Johann Doppler (circa

1842), if the liquid is moving (and

therefore carrying the reflectors

with it) and oscillating energy is

imposed on the moving reflector,

the reflected energy’s frequency

of oscillation will be altered with respect to the transmitted frequency.

The magnitude of frequency change is directly proportional to the ve-

locity of the reflector.

FLOW

Figure 1

SPECIFICATIONS

Description Specification

Power four AA alkaline cells provide over 30 hours of

operation

Flow Range 0.30 to 30.00 FPS [0.10 to 9.00 MPS]

Temperature electronics: -28°F to +140°F [-20°C to +60°C]

transducer: -40°F to +180°F [-40°C to +82°C]

Enclosure Rating NEMA 12X, splash resistant

Accuracy ±2% full scale

Transducer Mount Hand-held (clamp on), utilize acoustic

couplant such as DOW 111

CONTROLS AND TERMINOLOGY

Transducer Cable

Display

Transducer Jack

Transducer Plug

Keypad

Transducer Note: The UFX battery compartment is

located on the back of the enclosure.

Remove the two upper screws to gain

access to the battery compartment.

A. TRANSDUCER LOCATION

Selecting the proper location for taking a flow measurement is the single

most critical step in the operational procedure. The transducer utilized

by the UFX flow meter contains two piezoelectric crystals for transmitting

and receiving ultrasonic signals through the wall of a pipe. Select a

transducer location with adequate straight runs (without flow disturbances)

of pipe, both upstream and downstream, to achieve stable and accurate

readings. Examples of common piping configurations and the recom-

mended minimum upstream and downstream pipe lengths are included

in Table 1.

Note: If adequate straight plumbing cannot be provided the UFX will

operate repeatably, but will most likely not achieve ideal accuracy.

FLOW

Table 1

B. MOUNTING LOCATIONS ON THE PIPE

If the transducer is applied to

horizontal pipe, choose a mount-

ing position at approximately 3

o’clock or 9 o’clock, assuming 12

o’clock to be to top of the pipe.

These positions typically provide

optimum acoustic penetration

into the moving liquid. As illus-

trated in Figure 2, placement at

the top or bottom of the pipe can

result in poor sound penetration

due to air pockets (on the top of

the pipe) or sediment (at the bot-

tom of the pipe).

If the transducer is applied to vertical pipe, orientation

does not matter.

C. PIPE PREPARATION

Before the transducer face can be coupled to a pipe surface, an area

slightly larger than the flat surface of the transducer must be cleaned to

bare metal on the pipe. Remove all scale rust and paint. Thoroughly

dry and clean the mounting surface.

Note: For plastic pipes, such as PVC or PVDF, pipe preparation is

typically not required.

D. CONNECTING THE TRANSDUCER

Connect the transducer plug into the transducer jack. The connection

is polarized, so alignment of the keyway is necessary.

NOTE: The splash-resistant environmental seal is provided only when

the transducer plug is secured into the transducer jack. It is advisable

to make this connection before entering an area where the UFX may be

dropped into or splashed with liquid.

E. APPLYING THE TRANSDUCER

To ensure an acoustically conductive path between the transducer face

and the prepared pipe surface, a coupling compound is employed.

Enclosed with the UFX flow meter is a tube of Dow Corning 111 silicone

based grease. This grease is adequate for the majority of installations.

If an alternate grease is utilized, the grease must be specified not to

flow at the temperature of the pipe surface or the ambient conditions.

YES

Figure 2

YES

Figure 3

Apply an even layer of grease, ap-

proximately 1/8” [3 mm] thick to the

flat surface of the transducer. Place

the transducer on the prepared area

of the pipe, with the cable pointing

downstream. See Figure 3. Align the

transducer with the pipe, ensuring

that it is parallel with the pipe wall.

Apply only enough pressure to hold

the transducer in place. If no reading

is shown, perform a “rub test” by rub-

bing thumb across the dry transducer

head. The zeros should display a low

flow reading. See Troubleshooting

Guide for further recommendations.

F. OBTAINING A READING

Press the ON/OFF key on the keypad. On power up, the UFX performs

internal diagnostics and starts the ultrasonic transmitter. The display

will read Hold for approximately 5 seconds during this time. If the

transducer is properly mounted to a pipe containing flowing liquid with

at least 100 ppm of 100 micron or larger particles or entrained gases,

the display will begin to indicate velocity. The default units of measure

are FPS (feet per second). The response time of the UFX is approxi-

mately 10 seconds to ob-

tain a reading. Adequate

signal strength is obtained

when the OK icon appears

in the upper right corner of

the display. See Figure 4.

Readings taken without

this icon present may be

erroneous. It is recom-

mended that survey read-

ings of at least 30 seconds be taken to ensure reading stability.

The UFX can be turned off by pressing the ON/OFF key on the keypad,

or the unit will automatically turn off after approximately 3 minutes of

operation.

G. CHANGING UNITS OF MEASURE

Toggle between FPS (feet per second) and MPS (meters per second)

by depressing the FT/SEC M/SEC key on the keypad.

Figure 4

Figure 3

FLOW

Transducer Cable

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