Railway Scale Description

SCALEX RDW electronic weighing system is designed for measuring wheel and axle loads of railway vehicles as well as their total weight. The basic element of the weighing system is the SCALEX steel weighbridge for measuring/weighing wheel loads. SCALEX RDW railway system complies with all metrological and railway regulations and standards related to weighing and to checking the total weight and axle and wheel load of rail vehicles.

Advantages of Scalex RDW Railway Scale

  • excellent accuracy
  • verified for commercial use
  • scale for static weighing of the load of individual wheels of the boogies
  • also available in versions with several railway gauges

Specifications of Scalex RDW Railway Scale

The length of the weighbridge and its weight capacity shall be chosen with regard to the range of rail vehicles on which wheel/axle loads are to be measured. SCALEX steel weighbridge is equipped with measuring elements – 4 pcs of Scalex SB strain gauge load cells.

The weighbridge construction height is 400 mm, and the width of the weighbridge is 360 mm. The weighbridge is a fully electronic weighing bridge. This means that it requires virtually no ongoing maintenance under normal operating conditions (e.g. outdoors or in an assembly hall, test room, etc.). In comparison with the so-called hybrid systems (classic mechanical scale with one or two electromechanical cells) where sensitive mechanical elements are a source of frequent failures and require constant maintenance, the SCALEX RDW electronic weighing system guarantees high reliability with minimal operating costs.

The signal of strain gauge load cells is evaluated in the microprocessor indication and evaluation unit SCALEX 1900P. This device supplies the cells with DC voltage and evaluates a measurement signal that is proportional to the bridge load. The total analogue measurement signal of the cells is digitized, and the bridge load (wheel pressure) is shown on the evaluation unit display. In a multi-weighbridge system, each bridge is equipped with its own evaluation unit built into a 19″ steel enclosure.

Weighing Results

The weighing/measuring accuracy complies with the international OIML recommendation and EN ČSN 45501 (Metrological aspects of scales of non-automatic weighing instruments). These scales have an European-type approval (EC-type approval valid in all EU countries under TCM 128/20 – 5753), laying down the technical requirements for non-automatic weighing instruments. The weight capacity of an individual bridge is 15 tonnes (the weight capacity is based on the parameter of maximum wheel pressures of the driving vehicles). According to the above-mentioned standard, the maximum permissible deviation (measurement/weighing error) is allowed:

Load range
up to 2.5 t
from 2.5 t to 10 t
from 10 t to 15 t

Permissible deviation (on official verification)
± 2.5 kg
± 5 kg
± 7.5 kg

Permissible deviation (in operation)
± 5 kg
± 10 kg
± 15 kg

The SCALEX RDW weighing system includes a terminal with evaluation units for each weighbridge and a SCALEX PC computer. The evaluation and processing of additional and weighed data (printout reports, HRV database, archive – storage of weighing results, creation of reports and statistics, possibility of connection to the company information system, etc.) takes place on the connected computer with the supplied data processing program.