ST VA8041 Manual de usuario

Ultrasonic Thickness Gauge

VA8041

Operation Manual

Contents

Ⅰ．Preface…………………….………………………..1

Ⅱ．Safety information…………………………………1

Ⅲ．Functions & Features………….…………………..1

Ⅳ．Specifications………………………..……..…..…2

Ⅴ．Mounting battery & probe.….………………….…3

Ⅵ．The method of usage….……………….……..…….3

Ⅶ．Calibrating Meter…….……………………………6

Ⅷ．Notices…………………………...….….……..…….7

Ⅰ．Preface

Please read the following information carefully

before using the meter. The ultrasonic thickness gauge

has been designed to measure the material thickness that

callipers can’t measure, such as boiler, pressure vessels,

armor of tank, ship hulls, glass wall, tubes and so on.

Ⅱ.Safety information According to European

Union’s CE safety norms.

Please use it according to the following condition.

Environment conditions:

●Ambient temperature: -10~ +50℃(+14~ +122℉)

●Storage and transport temperature: -40~+70℃

(-40~+158℉)

Maintenance & Save:

Do not clear the meter using alcohol and impregnate. If

you do not use it for a long time, please take out the

batteries and place the instrument in a dry surrounding.

Ⅲ．Functions & Features

●Measuring thickness of various good ultrasonic wave

conductors as steel, aluminum, copper, glass etc.

.1.

●Ultrasonic wave velocity or thickness display.

●Manual material selection.

●Ultrasonic wave velocity adjustable.

●Thickness unit “mm” or “inch” optional.

●Ultrasonic wave velocity testing.

●Coupling state display.

●Shut down manually or automatically.

●Low battery voltage indication.

●Buit-in calibration metal block (4.0mm).

●Software calibrating to insure high reliability.

Ⅳ．Specifications

●The meter has been designed according to EC directive:

89/336/EEC.

●Ultrasonic wave frequency：5MHz.

●Digital display：4 digital.

●Measurement range：1.2mm~220mm (steel).

●Tubes measurement：minimum dia. 20mm*3mm.

●Ultrasonic wave velocity：1000~9999 M/ S.

●Resolution：0.1mm.

●Accuracy： ±(1%H+0.1mm).

●Measurement rate：0.6 second.

.2.

●Power supply: 7# alkaline cell , 1.5V*3 .

●Operating temperature: -10 ~ +50℃(+14~ +122℉)

●Storage temperature：-40 ~ +70℃(-40 ~+158℉)

●Dimensions：(L)×(W)×(H) mm.

●Weight ：approx g (including battery and probe).

●Accessories：probe, coupling paste, operating manual,

batteries.

Ⅴ．Mounting battery and probe

Remove the battery cover on the back and put in three

1.5V 7＃alkaline batteries according to the mark on

the shell to insure putting batteries in correctly, then

close the battery cover. Insert two plugs of the probe

into two sockets on the top of the meter.

Ⅵ．The method of usage

1. Press button “On/Off ” , the meter selects material 1

automatically , and displays the velocity of ultrasonic

wave in material 1.

2. Press button “Select” to choose a material you will

measure. A number displays on the bottom of the screen

to indicate the material. The numbers correspond to the

.3.

materials listed in table (1). Smear a little of coupling paste

on the surface of the measured object, put the probe on

and press it. A coupling symbol would appear If coupling is

all right. Synchronously the thickness of the measured

object would display instead of ultrasonic wave velocity. If

coupling isn’t good, the coupling symbol will not appear

and can not get thickness.

Table(1)

Digit Material Ultrasonic wave speed

1Iron 5900 M/S

2Aluminum 6320 M/S

3Copper 4700 M/S

4Brass 4430 M/S

5Gold 3240 M/S

6Silver 3600 M/S

7Zinc 4170 M/S

8Stannum 3320 M/S

9Glass 5850 M/S

10 Plastic 2250 M/S

11 Toughened tile 5580 M/S

.4.

Water(20°C) 1480 M/S

Material a 6500（user adjusting）

Material b 5500（user adjusting）

Material c 4500（user adjusting）

Material d 3500（user adjusting）

Material e 2500（user adjusting）

3. When take the probe out from object, the coupling

symbol disappears, but thickness keeps displaying.

4. At the state of displaying thickness and do not measure,

Press button “mm/inch”, thickness unit “mm” changes

into “inch” or contrarily.

5. At the state of displaying thickness and do not measure,

press button “Select” to display ultrasonic wave speed,

thickness will disappear.

6. Material a~e (digit 13~17) are offered to user to set

own material. Press button ▲or ▼, its velocity is

adjustable.

7. If user do not know the ultrasonic wave velocity of

own material, can test it by oneself：

.5.

A. Make a block with measured material (the more thick

the block, the more exact the result is), measure its

thickness by a callipers carefully.

B. Select anyone of material a~e, and measure its

thickness by the probe. When the digits of thickness

display steady , take the probe out from the block.

C. Press button ▲or ▼to change the digits untill it is

equal to the value measured by the callipers.

D. Press button “Select” ,the ultrasonic wave velocity of

user’s material will appear. When shut the meter down,

the ultrasonic wave velocity will be saved into a

memory.

8. To set power off :

When the meter is working, pressing button On/Off

will get shutdown immediately.

9. Automatic shutdown

When the meter is working , and stop to press button

for five minutes, shutdown will occur automatically.

Ⅶ．Calibrating the meter

When changing a new probe, or the probe is abrased or

the meter is used for a long time, you need to calibrate

.6.

the meter by yourself, the method is follow：

Power on the meter, smear a little of coupling paste

on the surface of the metal block buit-in the shell of the

meter. Put the probe on and press it, when coupling

symbol appears, press button “Adjust” for two seconds,

four bars appear on the screen. Keep to press the probe,

button “Adjust” can release. You can see the bars

disappear gradually.Finally “4.0 mm” displays, the meter

will be calibrated.

Ⅷ．Notices

1. The ultrasonic wave velocity listed in Table(1) is for

reference. Because the component of your material may

not be identical with that listed in Table(1), had better

make sample block to test the wave velocity in it.

2. Poriferous matter, or uncompacted material isn’t a good

ultrasonic wave conductor, can not be measured by the

meter. Casting has large crystals, if its surface is rough,

it is difficult for us to test thickness by the meter.

3. When measuring thickness under 2.5mm, sometimes an

error named as “double refraction” may occur. Another

error is named as “ pulse envelope or cycle jump”. They

.7.

bring on a bigger result than actual thickness. So when

measuring thin object, should do it repeatedly to look for

the least value. If necessary, make an thin block to

compare measuring result.

4. Rough surface may affect test, Burnish it by sand paper,

and then measure.

5. When the surface has thick paint, scrape it off and then

measure.

6. Coupling paste is necessary for test, it can eject air out

off the gap between the probe and the object to get

ultrasonic wave to pass. For slippery surface as glass,

water can replace coupling paste. For rough surface,

more viscous coupling paste must be used, such as

lubricating oil.

7. To measure tubular object, Smear more coupling paste,

get the direction of sound insulation board in the

probe perpendicular to axes of the tube, rolling the

probe along the axes back and forth slowly. When the

coupling symbol appear, look for the minimum value.

For small tube (diameter =20mm), if it’s thickness is

less than 3mm, the result of measurement is wrong.

.8.

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