Ergonomic and Reliable
The UDS2-73 is intended for continuous inspection of rails and railway switches at a speed of 4 km/h with further verification of indications via the hand testing procedure.

The flaw detector consists of an electronic unit, 4 multiplexer units, 26 probe units, a storage battery, and 2 couplant tanks fixed onto a trolley.

Multiple channels (28 for continuous testing and 3 for hand testing) are capable of providing complete inspection of the rail (excluding its base blades). Every other millimeter of traveled distance is scanned with the results saved to the internal memory.

The recorded data can be presented as A-scan, B-scan, or A-scan + B-scan. The results can be retrieved as individual reports linked to path and GPS coordinates.

• sound and visual alarm, mode switching with the help of "hot buttons";
• electronic registration of test results from all channels allows reinterpreting them and making complete reports;
• mode of determining the rail type and automatic correction of settings;
• mode of testing bolt holes with special settings;
• B-Scan in real time is used from one, two or four channels (of the left and right rails of driving-into and driving-out channels) for the in-depth analysis of detected signals, apart from the common information display in the form of А-scan;
• possibility of TCG curve (of any shape) plotting.

Probe units
The UDS2-73 flaw detector employs contact probe units of conventional type with both standard and specialized probes.

The probe units are made from wear resistant plastic material, with hard-metal inserts on the working surface.

rail head

• echo technique with an angle-beam probe for testing the field and gage side of the railhead in the direction of motion and against the direction of motion;
• echo technique with an angle-beam probe for testing the central part of the railhead in the direction of motion and against the direction of motion;
• echo-mirror technique with an angle-beam probe for testing the central part of the railhead in the direction of motion and against the direction of motion;
• echo-mirror technique with an angle-beam probe for testing the field and gage side in the direction of motion and against the direction of motion;

web and its projection in the base

• echo and mirror-shadow techniques with a straight-beam single-crystal probe for detection of longitudinal horizontal cracks;
• echo techniques with an angle-beam probe in the direction of motion and against the direction of motion for detection of transverse cracks and testing bolt holes;

The flaw detector using the standard scanning schemes enables detecting all types of fatal defects with the following features:

• transverse cracks in the 2nd-category railhead, including well-developed transverse cracks with reflecting surface, and also the ones developing under horizontal rolling surface separations which are not detected by the standard echo technique;
• longitudinal horizontal cracks in the web, even if they do not reach the rail axis in their development, and also in the head, including the ones that do not go beyond the web projection;
• longitudinal horizontal cracks located in the middle of the rail height;
• cracks from bolt holes, including the ones at an early stage of their development when they do not go beyond the bolt hole projection onto the roll surface;
• vertical cracks in the base and web located mainly along the rail axis;
• transverse corrosion cracks in the base located in the web projection area.