A1220 Low-frequency Ultrasonic Flaw Detector


Low-frequency ultrasonic flaw detector A1220 MONOLITH is suitable for solving of thickness measuring and flaw detection tasks for difficult materials, such as concrete, stone, asphalt, etc. The unique feature of the device is that it can control using echo-method at one-side access to the object of control, that makes possible the testing of the functional structures, such as biuldings, bridges, tonnels, etc.

One of the main advantages of the device, is that the testing is performed without using any contact liquid, because of the dry-point-contact transducers used in antenna array. That also allows not to prepare the surface of control and makes the testing process simple and fast.

Areas of application

  • The search of foreign inclusions, cracks and pores inside of constructions from concrete, stone, Plastics and alike materials at one-side access to the object of control.
  • Thickness measuring of constructions from concrete
  • The reasearch of the internal structure of the large-grained materials
  • Evaluation of the concrete strength with help of through sounding


A1220 MONOLITH consists of electronic unit with a screen and a keyboard and a 24 element (6x4) matrix antenna array. The antenna array elements construction allows to test without using any contact liquid, i.e. with dry-point-contact. All of the elements have an independent spring load, which allows to test uneven surfaces. Additional ultrasonic transducers with transversal and longitudinal ultrasonic waves are used for through sounding.


The device can display the results in diffirent forms:

In A-scan form

Traditional from of signal display. The results display in form of an A-scan is convinient for measuring thickness of the object of control, flaw searching and analysis in selected area of the object. The fully digital section of the device can display signals both in detected form and as a radio signal, which is very important for data analysis. This allows additional possibilities of interpreting the signals, such as differenciating useful signals from noise, and detect signals from various reflectors.


The display of a A-scan in real scale or with realizations averaging-out. The following measurements can be carred out: time interval between two signals or between the zonding pulse and the signal, distance measurement to the reflector, signal amplitude measurement. One of the following parameters is being displayed on the screen: latency, distance, signal amplitude or gain. 

ZOOM mode

The feature of this mode is the increased quantity of displayed parameters and two display windows, showing the general view of the signal and the zoomed area.

  • B-scan form

The display of measurement results as a cross-section. B-scan gives a more full image of the internal structure of an object. 

 BAND mode

This mode is suitable for displaying the results of a control as a cross-section of an object, perpendicular to the surface, at scanning along the line with a fixed scan step. The cross-section on the screen is shown as a binary image, where black pieces mark the places, where signal level is higner than the threshold and the other places stay white. BAND biulding is convinient when controlling an extensive object of control along one line. The option of getting results in colour mode and in half-tone mode is available with help of an external PC and special software. 

 MAP mode

MAP mode is suitable for forming the number of cross-sections of the object of control while scanning with an antenna array along marked up lines with a fixed step. In other words, it is a set of BANDs wit limited length. An image of the internal structure can be received


A1220 MONOLTH is simple to setup and use, because of its intuitive interface and the icon menu, that provides fast access to the main settings of the device.

The ergonomical design of the device, its small weight (just 650 grams with a built-in battery) and a set of "hands-free" straps make the device a conviniet instrument for working in hard-to-reach places.

All of the measurements can be saved into memory of the device and can be transferred to PC for further analysis and backup. 




Maximum deepness of the echo-signals visualization (at transversal wave control)

2150 mm

Maximum length of the signal realizations, visible on screen

1600 mks

Average thickness of concrete measured

600 mm

Minimal diameter of flaw (in form of an air cylinder)

30 mm

The error of thickness measurement


Time of one measurement processing and writing the result in memory

3 s

The number of single A-scans, that can be written into memory


Maximal lenth of single B-scan (BAND mode)

10 m

Maximal area of controlled surface (MAP mode)

2 m2

Material velocity range

from 1000 to 9999 m/s

Amplitude of the zonding signal

20, 100, 200 V

The form of the zonding signal

Meandr, 0,5÷5 periods

The frequency of zonding signals

from 1 to 50 Hz

Receiving bandwidth

from 10 to 300 kHz

Gain setup range

from 0 to 106 with step of 1 dB

The quantity of the programmable points of DAC function


DAC function setup range

30 dB

Threshold of flaw detection signalizator

from 0 to 100 %

Discreteness of time range change

0,1 mks

Operation time

14 hours

Charging time

3 hours

Display type

LCD display

Operating temperature range

from -20°C to +45°C

Size of electronic unit

245 x 120 x 40 mm

Weight of electronic unit

650 g/td>

Size of M2502 antenna array

140 х 88 х 74 mm

Weight of M2502 antenna array

750 g

Basic delivery set



A1220 MONOLOTH - electroniс unit with rechargeable battery


M2502 antenna array


ITV - software for moving data from A1220 MONOLITH to PC


LEMO-LEMO cable, double, 1,2 m


Case for А1220 MONOLITH


Charging device for A1220 MONOLITH


Power adapter foк A1220 MONOLITH


USB connection cable


Hard case for А1220 MONOLITH


Compatible with transducers:

  • Dry-point-contact transducers:


T1802 (transveral waves; frequency 50 kHz)

L1803 (longitudinal waves; frequency 100 kHz)

  • Liquid contact transducers:

S0205 (longitudinal waves; frequency 25 kHz)

S0206 (longitudinal waves; frequency 50 kHz)

S0208 (longitudinal waves; frequency 100 kHz)