LPM/TPM III-RT - speno international sa

On board measuring systems – LPM/TPM III-RT
The measurement of rail wear faults is the primary condition of quality grinding. Speno International S.A. has developed the LPM/TPM III-RT system to satisfy the
latest developments in international standards (prCEN 13231) and thus guarantee unequalled measurement accuracy.
Based on the latest innovations in measurement acquisitions, this technology guarantees a
quality measurement without loss of production: thanks to a real-time processing, several
measuring chains display the state of the rail before and after grinding on the same screen.
This synchronisation can be carried out on the same machine equipped with two trolleys, or
between two coupled trains.
The reliability of PXI technology and the choice of the most advanced equipment ensures
optimal robustness in the face of difficult worksite conditions.
The measurement of corrugations, also known as longitudinal measurement, is a
differential contact measurement (LVDT 1 ). By means of a complex algorithm, which is the
exclusive property of Speno International S.A., the software determines the amplitude of
the corrugations.
The measurement of the rail profile, also termed cross section measurement, is a laser
based measurement. The software extracts 8 points defined by the client to characterise
the profile.
Displayed on the screen is a colour bar graph permitting the rapid identification of those
parts of the measured profile which do not correspond to the target profile.
The software supplied by Speno International S.A. permits the creation of a number of
different reports, including detailed analyses, statistical summaries as well as clear and
easy to use graphical representations. The office version permits the re-reading of
measurements to create reports with any kind of PC.
1. Linear Variation Differential Transducer 2. Microsoft Windows® 2000 or later
SPENO INTERNATIONAL S.A. - 26, parc Château-Banquet - eng v1 1/2
P.O. 16 - 1211 Geneva 21 - Switzerland
Tel. +41 22 906 46 00 - Fax +41 22 906 46 01 - E-Mail info@speno.ch

Software parameters permit the separation of the waves into several categories, known as bands, according to their length. Since corrugation has different effects
according to its wavelength, the tolerances are different for each band. The software allows the configuration of up to four independent bands, overlapping or not
overlapping.
Reports in the form of bar graphs represent the
divergences between the target and the measured profiles
Zone outside Zone within tolerance
Tolerance (not ground) (ground)
in order to verify if the result is in compliance with the
tolerances.
Tolerances
Averaged rectified waves
Example of a printout of the longitudi nal measurement (direct waves)
Printout of a measured and a target profile
Statistical reports : summary sheet and detailed data
Technical characteristics
On board measuring systems LPM/TPM III-RT
LPM (longitudinal meas.)
TPM (cross section meas.)
Accuracy ± 10 µm ± 100 µm
Resolution ± 1 µm ± 10 µm
Measurement range 10-3000 mm -90° to +15°
Acquisition frequency 0.002 mm (500 samples/m) 20 Hz
Max. speed 20 km/h 20 km/h
Type of measurement contact (inductive sensors LVDT) optical (laser)
SPENO INTERNATIONAL S.A. - 26, parc Château-Banquet - eng v1 2/2
P.O. 16 - 1211 Geneva 21 - Switzerland
Tel. +41 22 906 46 00 - Fax +41 22 906 46 01 - E-Mail info@speno.ch