Acoustic control systems A1207 User manual

“Acoustic Control Systems” Ltd.
OPERATION MANUAL
Ultrasonic Thickness Gauge
A1207 / A1207C
Moscow, 2006

ULTRASONIC THICKNESS GAUGE - A1207 (A1207C)
Acoustic Control Systems, Ltd.
Moscow, 2006
2

ULTRASONIC THICKNESS GAUGE - A1207 (A1207C)
Acoustic Control Systems, Ltd.
Moscow, 2006
3
1. GENERAL INFORMATION.................................................................. 4
1.1. GENERAL APPLICATION ...........................................................................4
1.2. DESCRIPTION ............................................................................................ 5
1.3. DELIVERY SET ...........................................................................................7
2. DEVICE OPERATION.......................................................................... 8
2.1. PREPARATIONS TO MEASUREMENTS....................................................8
2.2. MEASUREMENTS USING PRESET ULTRASOUND
VELOCITIES...........................................................................................................8
2.3. MEASUREMENTS AND ADJUSTMENT OF DEVICE ................................. 9
3. ADDITIONAL ADJUSTMENTS OF THE DEVICE............................. 11
3.1. ADJUSMENTS ON THE KNOWN VELOCITY IN TESTIND
MATERIAL............................................................................................................12
3.2. ADJUSTMENT ON THE ARBITRARY ULTRASOUND
VELOCITY IN TESTING MATERIAL WITH THE KNOW THICKNESS ................13
3.3. SET OF THE LOW THICKNESS LIMIT .....................................................16
4. TECHNICAL SPECIFICATION .......................................................... 17
5. PRINCIPLES OF OPERATION.......................................................... 18
6. SOME NOTES ON OPERATION....................................................... 19
7. MAINTENANCE WORKS .................................................................. 21
7.1. RECHARGING OF ACCUMULATORS...................................................... 21
7.2. ADAPTATION TO THE PROBE’S NOISE LEVEL .....................................21
7.3. REPLACEMENT OF THE PROBE’S CAPSULE........................................ 22
8. WARRANTY ...................................................................................... 24
9. CE-STANDARDS CONFORMANCE ................................................. 26
10. ATTACHMENT................................................................................... 27

ULTRASONIC THICKNESS GAUGE - A1207 (A1207C)
Acoustic Control Systems, Ltd.
Moscow, 2006
4
1. GENERAL INFORMATION
1.1. GENERAL APPLICATION
A1207 and A1207C are small hand-held Ultrasonic Echo-pulse Thickness Gauges in a
form of marker-pen, designed for general thickness measurements. A1207C is a special
version of A1207 that is equipped with single crystal probe (“C” in the end of the marking
means ‘single crystal probe’).
A1207 – is applicable for measurements of wall thickness on tubes, pipes (including
pipe-turns), pressure vessels, boilers and other subjects from black and non-ferrous
metals with flat and corroded surfaces, which roughness is up to Rz160 and curvature
radius is from 10 mm. The range of thickness for measurements on steel is 0,8 up to 30
mm.
A1207C – is applicable for measurements of height for rails and other metallic subjects
with surface roughness up to Rz160 and curvature radius from 40 mm. Range of
thickness for measurement on steel is 10 up to 200 mm.
Range of ultrasound velocity in the testing materials can vary from 1000 to 9000 m/s.
As a couplant can be used different technical oils, glycerin, gel and other.
Operating conditions for these devices are as follows:
• Environmental temperature: -30°C up to +50°C;
• Relative humidity 85% at 25°C;
• Atmosphere pressure up to 106,7 kPa

ULTRASONIC THICKNESS GAUGE - A1207 (A1207C)
Acoustic Control Systems, Ltd.
Moscow, 2006
5
1.2. DESCRIPTION
рис. 1.
1.Electronic unit in the plastic case
2. Digital light-emitting diode display
3. Capsule of piezoelectric transducer
4. On/Off button
5. Ultrasonic velocity choice button
6. Plug for charging unit
7. Finger holders
8. Cap
9. Clip for wearing on clothes
10. Additional set up buttons
A1207 is equipped with double crystal piezoelectric probe on 10MHz operating frequency
and with 6 mm operating surface diameter.
A1207C version is equipped with single crystal probe on 2,5 MHz operating frequency
and with 10 mm operating surface diameter.
The structure of A1207 and A1207C allows replacing the probe’s capsule in case of
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ULTRASONIC THICKNESS GAUGE - A1207 (A1207C)
Acoustic Control Systems, Ltd.
Moscow, 2006
6
wearing. This replacement can be made by the operator himself and is described in the
item 7.3 of this manual.
The digital light-emitting diode display makes possible the application of the device in a
wide range of temperatures (from -30°C up to +50°C). The device should be switched on
right before the measurement. The power on condition of the device is indicated with four
strokes on the display or result of thickness readings or any other information on the
display.
The continuous operating time from the built-in accumulator is not less then 24 hours.
Recharging of the accumulator is made through the special plug [6] (Pic 1). Time of
charging is about 11 hours. It is also possible to work with the external power supply that
should be connected to the same plug.
For adjustment of the ultrasound velocity in testing material there is a button for choice
of ultrasound velocity [5] (Pic 1). Usually there are four most frequently used velocity
meanings for structural alloys are preset in the device.
5400 m/s Stainless Steel
5950 m/s Low-alloyed Steel
6060 m/s Steel 40Х13
6300 m/s Aluminium Alloy D16
For more exact adjustment of the ultrasound velocity for a particular material there are
three additional (hidden) buttons [10] in the device. These buttons are hidden behind
the front panel of the case (Pic 1). With these buttons you can set the meaning of
ultrasound velocity from 1000 up to 9000 m/s with a step of 10 m/s. These set-up buttons
allows the operator adjust the meanings of four saved velocity meanings under his own
testing materials and then choose them already with external button of velocity choice.
Besides with the help of these additional buttons the operator can also set the following
parameters:
• Time interval, that compensates signal’s delay time in prisms of ultrasonic probe;
• The lower limit of measuring thickness range;
• Contrast level of the display;
• Dimension of the testing readings (metric or English).
All the set characteristics of the thickness gauge are saved after turning off the device
and at empty accumulators.
There are also finger holders on the device’s case that stop fingers when measuring,
special clip for wearing the device on the clothes and a cap that has two purposes at the
same time:
• It protects the surface of the probe from damaging during transportation and
storage.
• It efficiently covers the probe’s surface with contact liquid.

ULTRASONIC THICKNESS GAUGE - A1207 (A1207C)
Acoustic Control Systems, Ltd.
Moscow, 2006
7
1.3. DELIVERY SET
The basic delivery set for A1207 (A1207C):
№Description Quantity
1. Ultrasonic Thickness Gauge A1207 (A1207C) with built-in
accumulator and built-in probe 1 item
2. Cap 1 item
3. Clip for wearing on clothes 1 item
4. Bag 1 item
5. External charging unit for A1207 (A1207C) 1 item
6. Steel control testing block for A1207 1 item
7. Passport of the device 1 item
8. User’s Manual 1 item
As the additional accessories to the basic set there are also available:
• Probe’s capsule on 10 MHz (2,5 MHz);
• Accumulator NiMH (1,2V);
• Cable for external power supply;
• Spare nameplates

ULTRASONIC THICKNESS GAUGE - A1207 (A1207C)
Acoustic Control Systems, Ltd.
Moscow, 2006
8
2. DEVICE OPERATION
2.1. PREPARATIONS TO MEASUREMENTS
Attention! Before starting measurements clean the surface of the testing object from dirt,
friable rust or calx and then put enough contact liquid on the area of testing
2.2. MEASUREMENTS USING PRESET ULTRASOUND VELOCITIES
To measure object’s thickness you need to do following:
{
Press On/Off button
On the display you will see four horizontal
strokes.
|
Press and hold the button of velocity choice.
On the display you will see the preset meanings
changing each other in 2-3 seconds. When you
see the necessary meaning, appearing on the
display, leave the button.
}
Put the device on the testing object and hold it 1-
2 seconds until you get the thickness readings,
screened on the display.

ULTRASONIC THICKNESS GAUGE - A1207 (A1207C)
Acoustic Control Systems, Ltd.
Moscow, 2006
9
Notes: When you hold the device on the testing surface there is an
indication of an acoustic contact on the display.
• In a metric system in the upper left corner you will see the symbol
as at the picture on the right.
• In Imperial system in the lower right corner there is a symbol as
presented on the picture.
In a case of a bad contact with the surface the symbol will disappear.
~
Take the device from the object and see the
result of the reading. The reading will be
screened during 7-10 seconds and then will be
changed on four horizontal strokes.
Sometimes at the moment, when you take the
device of the object, the reading can change. In
this case you need to repeat measurement.
2.3. MEASUREMENTS AND ADJUSTMENT OF DEVICE
If you get doubtful readings, when measuring thickness, you may need to test the device.
For that you need to use the steel testing sample block that is in the basic set of the
device.
To test the device (both A1207 and A1207C) you need to do the following:
{
Press the On button.

ULTRASONIC THICKNESS GAUGE - A1207 (A1207C)
Acoustic Control Systems, Ltd.
Moscow, 2006
10
On the screen you will see horizontal strokes.
|
With the help of Velocity choice buttons set the
ultrasound velocity for the control steel sample
block.
}
Put the device on the control block and hold for 1-
2 seconds, until the reading stops changing on
the display.
~
Take the device of the block and see the result of
testing. The device’s reading should be the same
as the real thickness of the sample block.
If the reading of the device differs from the real thickness of the block, then you will have
to adjust the threshold unit of the device under the new noise level of the probe (see item
7.2) and then test the device one more time.