Czech Metrology Institute  
Okružní 31, 638 00 Brno  
 
1. ------IND- 2018 0301 CZ - EN- ------ 20180711 --- --- PROJET 
Executive summary for the EC (not part of this legislation)  
Measuring devices for determining the load per axle or wheel of rolling stock are placed on the 
market and put into use in the Czech Republic in accordance with Directive 2014/31/EU (Non 
Automatic Weighing Instruments – NAWI).Once they have been put into use, they become subject to 
national metrology regulation – verification at specified intervals.  
This notified legislation only applie s to the verification of measuring instruments that have already 
been put into use.It does not concern placing them on the market or putting them into use.  
(End of executive summary.)  
 
Contact person:Mgr.Tomáš Hendrych  
Phone:545  555 414 
 
 
P U B L I C  D E C R E E  
 
As the authority with substantive and territorial jurisdiction in the matter of laying down metrological 
and technical requirements for legally controlled measuring instruments and stipulating the testing 
methods for type approval and verification of legall y controlled measuring instruments pursuant to 
§ 14(1) of Act No  505/1990 on metrology, as amended (hereinafter referred to as the ‘Metrology 
Act’), and in accordance with the provisions of §  172 et seq. of Act No  500/2004, the Administrative 
Procedure Cod e (hereinafter referred to as the ‘APC ’), the Czech Metrology Institute (hereinafter 
referred to as the ‘CMI ’) commenced ex officio proceedings on 4 April 2017 pursuant to §  46 APC, 
and, on the basis of supporting documents, issues the following:  
 
I. 
DRAFT  G E N E R A L  M E A S U R E  
number:0111 -OOP -C085 -16 
laying down the metrological and technical requirements for legally controlled 
measuring instruments, including testing methods for type approval and verification 
of the following legally controlled measuring instru ments:  
 
'Measuring devices for determining load per axle or wheel of rolling stock'  
 
 General measure No  0111 -OOP -C085 -16 
2 1 Basic definitions  
For the purposes of this general measure, terms and definitions pursuant to VIM and VIML1 as well as 
the terms and definitions stated below shall appl y: 
1.1 Basic definitions  
The definitions below apply to Figure 1.  
Figure 1 - Rolling stock and rail  
otočný čep  pivot  
rozvor podvozku  bogie wheelbase  
nosič zatížení  load carrier  
přibližovací úsek  approach section  
podvozek  bogie  
1.1.1 measuring devices for  determining the load per axle or wheel of rolling stock  (hereinafter 
referred to as 'devices')  
a measuring device used to determine the wheel or axle load of rolling stock using the effect of gravity 
on this vehicle; the device has non -automatic operation  with automatic balancing  
1.1.2 measurement of wheel load  
during measurement, the apparent mass of the rolling stock wheel is determined when it is stationary 
and its running surface is resting on the active running surface of the load carrier rail  
1.1.3 r unning surface  
the running surface base is the geometry of that part of the wheel's running profile that carries the 
rolling stock.It is in direct contact with the running surface of the load carrier rail; the wheel's running 
surface is a line, and the run ning surface of the rail in theory consists of points.  
1.1.4 rail axis inclination  
the divergence of the vertical axis of the rail from its horizontal footing; the chosen inclination is 
usually 1:20  
1.1.5 rail gauge (gauge)  
the spacing between the left and  right rail; the distance between the railheads measured 14 mm below 
the running surface; for a normal track, the rail gauge on a straight rail has a nominal value of 1  435 
mm 
                                                      
1 TNI 01 0115 International Vocabulary of Metrology – Basic and General Concepts and Associated Terms 
(VIM) and International Vocabulary of Legal Metrology (VIML) are part of the technical harmonisation 
compendium ‘Terminology in the field of metrology ’, which is publicly available at www.unmz.cz.  
nosič zatížení
přibližovací úsekpodvozekotočný čeprozvor podvozkuGeneral measure No  0111 -OOP -C085 -16 
3 1.1.6 wheelset  
the wheels of rolling stock, connected by an axle to a rigid unit , without the ability to turn 
independently of each other  
1.1.7 bogie  
for the purpose of this legislation, a bogie is defined as the mechanical connection of two or three 
wheelsets by a rigid frame  
1.2 Main parts  
1.2.1 load carrier  
the part of the equipmen t intended to receive the load; the carrier must include the rail  
1.2.2 evaluation and indication device (EID)  
a part of the non -automatic device that processes information on the magnitude of the load; the main 
part of the indication device is the display  that shows the load  
1.2.3 load cell  
a load cell is a transducer that converts a mechanical quantity (load) at its input into an electrical signal 
at its output; the magnitude of the electrical signal is directly proportional to the magnitude of the load  
1.2.4 remote indicator  
the part of the device situated in a location from where the device cannot be seen directly; the 
increment size of this device is identical to the increment on the main display of the EID  
1.2.5 approach section  
the part of the surroun ding terrain adjacent to the location of the device; the approach section is part of 
the device (see figure 1)  
1.2.6 joint bridge plates  
devices that serve to bridge the joint gaps between rails; they permit the load carrier to move 
independently and the r olling stock to cross the joint from the settling section of the load carrier to the 
load carrier without impact  
NOTE The upper surface is cylindrical.  
1.3 Metrological characteristics  
1.3.1 interval size for testing  
interval setting and display with a min imum resolution of 1/5 e (for testing purposes)  
1.3.2 capacity of the device ( Lim) 
the maximum permissible load to which the device can be subjected without damaging it or 
permanently impairing its metrological properties; the capacity of the device ( Lim) is higher than its 
maximum capacity limit ( Max) 
1.4 Influences and reference conditions  
1.4.1 influence quantity  
a quantity that is not measured, but has an influence on the measured value or device indication  
1.4.2 influence factor  
an influence quantity t hat has a value within bounds specified by this legislation  General measure No  0111 -OOP -C085 -16 
4 1.4.3 operating conditions  
conditions of use that specify the measuring range and influencing quantities for which metrological 
characteristics are within the limits of maximum permissible errors (MPE ) stipulated by this 
legislation  
1.4.4 reference conditions  
a given set of specific values of influence factors to ensure the mutual comparison of measurement 
results  
1.5 Electronic parts  
1.5.1 electronic subsystem  
a part of an electronic device that c omprises electronic elements and that has its own recognisable 
function  
1.5.2 module  
a part of a device that performs a specific function, can be tested separately and has had individual 
limit error values specified  
2 Metrological requirements  
2.1 Accuracy  class  
Accuracy classes III or III are specified for this device.  
2.2 Maximum permissible errors (MPE ) 
Maximum permissible errors used for loading greater than or equal to than the minimum capacity 
(Min) and less than or equal to the maximum capacity ( Max) are specified for a given accuracy class in 
Table 1.  
Table 1 – Maximum permissible errors (MPE ) 
Maximum 
permissible errors 
(MPE ) For load m, expressed by the quantity of verification intervals e 
Class III  Class III 
±0.5e 0 m 500 0 m 50 
±1.0e 500 <  m  2 000  50 < m  200 
±1.5e 2 000 < m 10 000  200 < m 1 000  
2.3 Eccentricity load  
Device errors when introducing a load equal to the maximum capacity ( Max) to various places on the 
load carrier (track) must not exceed the corresponding maximum permiss ible errors ( MPE ) in Table 1.  
2.4 Repeatability  
The difference between two results when determining the loading exerted by the same load placed on 
the load carrier under the same conditions must not be greater than the absolute value of the maximum 
permiss ible errors ( MPE ) under Table 1 for a given load.  General measure No  0111 -OOP -C085 -16 
5 3 Technical requirements  
3.1 Indicator  
3.1.1 Reading quality  
Reading of measurement results must be reliable, easy and unambiguous under conditions of normal 
use.The indication must be provided with the app ropriate unit of weight, either in text or as a symbol.  
All printing must be legible and indelible for the intended use.Printed numerals must be at least 2 mm 
high.  
If being printed, the text or symbol of the unit of measurement must be either to the right  of the 
measured value or above the values column*). 
*) A column is defined as an arrangement where at least three results of the same measured value are one above 
another.  
3.1.2 Indication limits  
The device must not display weight information that exceeds  the maximum capacity ( Max) by more 
than 9 e. 
4 Markings  
4.1 Descriptive markings  
Scales must be marked in a visible, legible and indelible manner with the following information:  
a) the number of the EU type -examination certificate, if available;  
b) the manufactu rer’s name, registered trade name or registered trade mark;  
c) the accuracy class, enclosed in an oval or in two horizontal lines joined by two half circles;  
d) maximum capacity, in the form 'Max ...';  
e) minimum capacity, in the form 'Min ...';  
f) verification scale interval, in the form 'e = ...';  
g) type, batch or serial number;  
and where applicable:  
h) for instruments consisting of separate but associated units, an identification mark on each unit;  
i) the scale interval, if different from e, in the form 'd = ...';  
j) the maxim um additive tare effect, in the form 'T = + ...';  
k) the maximum subtractive tare effect if it is different from the upper capacity ( Max), in the form 
'T = – ...'; 
l) the tare interval if it is different from d, in the form 'dT = ...';  
m) maximum safe load if it is  different from the maximum capacity ( Max), in the form 'Lim ...',  
n) special temperature limits, in the form '°C/...°C';  
o) the ratio between load carrier and load.  General measure No  0111 -OOP -C085 -16 
6 5 Type approval of the measuring instrument  
These measuring instruments are placed on the market  and into service with a conformity assessment 
in accordance with the Government Regulation on non -automatic weighing instruments2, meaning that 
they are not subject to type approval.  
6 Initial verification  
These weighing instruments are placed on the mark et with a conformity assessment pursuant to the 
Government Regulation on non -automatic weighing instruments2, meaning that they are not subject to 
type approval.  
7 Subsequent verification  
Tests are performed in non -automatic mode with a static load.  
7.1 Ge neral conditions  
Tests are performed using a standard test weight and rolling stock.If technically possible, a special test 
loading device may be used instead.  
The combined uncertainty of the test load implemented in the above -specified ways must be less t han 
one third of the maximum permissible error ( MPE ) of the tested device.  
7.1.1 Temperature  
Tests must be performed at a stable ambient temperature.The temperature is considered stable when 
the difference between temperature extremes recorded during the t est does not exceed one fifth of the 
temperature range of the given device or 5 °C, whichever is lower, and the rate of change does not 
exceed 5 °C per hour.  
7.1.2 Power  
Tests must be performed with power supplied as stipulated by the device manufacturer.  
7.1.3 Test arrangements  
A device submitted for testing must be complete.  
If the measuring instrument can be connected to a printer that was assessed for the purposes of the 
specified measuring instrument when placing the device on the market with a conform ity assessment, 
and this printer is commonly used with the device, the party ordering the tests will also supply this 
device.  
If the tested device is situated under overhead lines, for safety reasons the party ordering the tests will 
ensure power to the li nes is switched off in a timely manner.  
7.2 Standard weights  
The standard weight must comply with the requirements of OIML R 1113. 
                                                      
2 Government Regulation No  121/2016 on conformity assessment of non -automatic weighing instruments when 
being made available on the market.  
3 OIML R 111 Weights of classes E 1, E2, F1, F2, M 1, M 1-2, M 2, M 2-3 and M 3.This document is available to the 
public at www.oiml.org.  General measure No  0111 -OOP -C085 -16 
7 
7.2.1 Reference wagon  
The type of reference wagon is chosen according to the nature of the device installed.Figure 2 shows 
an example of a reference wagon.  
Figure 2 - Reference wagon example  
otočný čep  pivot  
rozvor podvozku  bogie wheelbase  
nosič zatížení  load carrier  
přibližovací úsek  approach section  
podvozek  bogie  
7.2.1.1 Wagon with two wheelsets  
A wagon with two wheelse ts can be used as a reference wagon.  
7.2.1.2 Wagon with bogies  
If several carriers are installed in sequence (for example for measuring and setting bogies), a wagon 
with four wheelsets (two bogies) is used.Figure 3 shows a bogie diagram.  
Figure 3 - Wagon bogie  
7.2.1.3 Loading a reference wagon  
If the axle load is not double the upper maximum capacity ( Max) of the device, it is loaded with a 
known weight so that the load per wheel is equal to 0.9x Max at most.  
7.3 Weighing test  
One set of measurements is pe rformed for loading and unloading with at least five load values, 
including zero, Min, Max, and points where the value of the maximum permissible error ( MPE ) 
changes.  
Errors in the device must not be greater than the maximum permissible error ( MPE ) for the  weight 
given in Table 1.  
nosič zatížení
přibližovací úsekpodvozekotočný čeprozvor podvozkuGeneral measure No  0111 -OOP -C085 -16 
8 7.4 Eccentricity test with a rolling load  
The device, more precisely the load carrier, must be tested at various locations on its active surface 
with a test weight that corresponds to the usual rolling load situated on it during r egular operation.For 
the purposes of this legislation, the usual rolling load is equal to half the permissible load per axle of 
the stock that is being measured on the device.  
Rolling stock loaded pursuant to Article 7.2.1.3 is used for the test.  
The refer ence wagon wheel rolls onto the load carrier rail.Load data is read from the indication unit of 
the device when the wheel is around 100 mm from the edge of the carrier rail, in the centre of the 
carrier, and on the other edge of the carrier - see Figure 4. The reading is done when the reference 
wagon is stationary.   
Figure 4 - Example of wheel placement when reading a measured value  
směr pohybu vozidla  vehicle movement direction  
kolo kontrolního vagónu  reference wagon wheel  
I. měření levý kraj  I. measurem ent at left edge  
II. měření střed  II. measurement at centre  
III. měření pravý kraj  III. measurement at right edge  
Load measurement results must not exceed the absolute value of the relevant maximum permissible 
error ( MPE ) as per Table 1.  
If the device h as automatic zeroing or zero monitoring, this function must not be activated during the 
test. 
7.4.1 Measured value reading  
Prior to the test, the interval value is reduced to at least e/5.A mark is placed on the measuring rail 
(load carrier) 100 mm from ea ch edge of the rail and in its centre.When reading indicated values, the 
wheel axle must be at the marked location - see Figure 4.Once one set of measurements has been 
completed, three pieces of data are available:  
 the value determined at measurement locat ion I. on the left edge of the rail - per Figure 4 ( IL); 
 the value determined at measurement location II. on the centre of the rail - per Figure 4 ( IS); 
 the value determined at measurement location III. on the right edge of the rail - per Figure 4 
(IP). 
The device can be zeroed after every set.  
A total of ten sets of measurements are performed.For each set of measurements, the wheel always 
moves in only one direction with respect to the load carrier.  
I. měřeníII. měřeníIII. měření
levý kraj střed pravý krajsměr pohybu vozidla kolo kontrolního vagónuGeneral measure No  0111 -OOP -C085 -16 
9 7.5 Repeatability test  
For the repeatability test, three sets of measurements must be performed with a load close to 80 % 
Max.The maximum difference between measurement results for the same load must not be greater 
than the absolute value of the maximum permissible error ( MPE ) for the given device.  
7.6 Error eva luation  
7.6.1 Tests with a standard test weight  
If the indication segment cannot be switched to a smaller value, the error ( E), prior to rounding, is 
calculated using the following formula:  
P = I + 0.5 e − L (1) 
where  I  ..........   is the indication,  
L   is the sum of the extra weights  
E = P − L = I + 0.5 e − L − L (2) 
where  L  .........   is the nominal value of a reference test weight placed on the measuring device carrier 
during the test.  
If the segment value can be reduc ed to at least e/5, the device error is calculated using the following 
formula:  
E = IZ − L (3) 
where  IZ  ........   is the measuring instrument indication under load.  
None of the determined device errors ( E) may exceed the value of the maximum permitted error 
(MPE ) as per Table 1.  
7.6.2 Tests using a rail vehicle  
The average value of the three measurements on the carrier (of the measured rail) is calculated using 
the following formula:  
IM = ( IL + IS + IP) / 3 (4) 
Deviations of individual measurements from the averag e value:  
EL = IL − IM (5) 
ES = IS − IM (6) 
EP = IP − IM (7) 
No determined deviation ( EL, ES, and EP) device being tested using a rail vehicle may exceed the value 
of the maximum permitted error ( MPE ) under Table 1.  
8 Measuring instrument re -test at the request of the perso ns concerned  
When examining measuring instruments pursuant to § 11a of the Metrology Act at the request of a 
person who may be affected by an incorrect measuring instrument, please proceed according to 
Chapter 7.The maximum permissible error used will be d ouble the maximum permissible errors 
(MPE ) specified in Table 1.  General measure No  0111 -OOP -C085 -16 
10 9 Notified standards  
For the purposes of specifying the metrological and technical requirements for measuring instruments 
and specifying the testing methods for their verification stemming fr om this general measure, the CMI 
shall notify Czech technical standards, other technical standards or technical documents of 
international or foreign organisations, or other technical documents containing more detailed technical 
requirements (hereinafter r eferred to as ‘notified standards ’).The CMI shall publish a list of these 
notified standards attached to the relevant measures, together with the general measure, in a manner 
accessible to the public (on www.cmi.cz ). 
Compl iance with notified standards or parts thereof is considered, to the extent and under the 
conditions stipulated by a general measure, to be compliance with the requirements stipulated by this 
measure to which these standards or parts thereof apply.  
For the  purposes of specifying the metrological and technical requirements for measuring instruments 
and specifying the testing methods for their type approval and verification stemming from this general 
measure, the CMI shall notify Czech technical standards, ot her technical standards or technical 
documents of international or foreign organisations, or other technical documents containing more 
detailed technical requirements (hereinafter referred to as ‘notified standards ’).The CMI shall publish 
a list of these n otified standards attached to the relevant measures, together with the general measure, 
in a manner accessible to the public (on www.cmi.cz ). 
Compliance with notified standards or parts thereof is considered, to the extent  and under the 
conditions stipulated by a general measure, to be compliance with the requirements stipulated by this 
measure to which these standards or parts thereof apply.  
Compliance with notified standards is one way of demonstrating compliance with the  
requirements.These requirements may also be met using another technical solution guaranteeing an 
equal or higher level of protection of legitimate interests.  
II. 
G R O U N D S  
The CMI issues, pursuant to §  14(1)(j) of the Metrology Act, for the implementation o f § 6(2), § 9(1) 
and (9) as well as §  11a(3) of the Metrology Act, this general measure laying down the metrological 
and technical requirements for the specified measuring instruments and for the verification of 
specified measuring instruments - 'Measuring  devices for determining the load per axle or wheel of 
rolling stock'.  
Implementing Decree No 345/2002 specifying measuring instruments for mandatory verification and 
measuring instruments subject to type approval, as amended, classifies the measuring inst ruments 
under item  2.1.5 a) in the annex entitled ‘List of legally controlled measuring instruments ’ as 
measuring instruments subject to type approval and mandatory verification.  
This legislation (general measure) will be notified in accordance with Direct ive (EU) 2015/1535 of the 
European Parliament and of the Council of 9  September  2015 laying down a procedure for the 
provision of information in the field of technical regulations and of rules on Information Society 
services.  
 
III. 
I N S T R U C T I O N S  
In accordan ce with §  172(l), in conjunction with §  39(l) APC, the CMI has stipulated a time limit for 
comments of 30  days as of the date of posting on the official notice board.Comments submitted after 
this time limit will not be considered.  General measure No  0111 -OOP -C085 -16 
11 The persons concerned are  hereby invited to comment on this draft general measure.With a view to the 
provisions of §  172(4) APC, the comments shall be submitted in writing and meet the requirements for 
submissions in accordance with §  37 APC.  
The comments shall include the particulars referred to in §  37(2) APC and clearly state the following: 
who is making the comments; which general measure they concern; to what extent the comments 
challenge the measure; how the general measure runs contrary to legislation or how the general 
measure or the procedure that preceded it is inaccurate; which matters the comments concern and what 
is being proposed. Said comments must also identify the administrative authority to which they are 
addressed and be signe d by the person making them.  
The supporting documents for this draft general measure may be consulted at the Czech Metrology 
Institute, Legal Metrology Department, Okružní 31, 638 00 Brno, after making arrangements by 
telephone.  
This general measure shall be posted for 15  days.  
 
 
 
 
 ...………………………… ..............  
RNDr.Pavel Klenovský  
Director -General  
 
 
Person responsible for accuracy:Mgr.Tomáš Hendrych  
 
Posted on:12 April 2018  
Signature of the authorised person confirming posting:............................. .......................  
 
Removed on:  
Signature of the authorised person confirming removal:....................................................