Czech Metrology Institute  
Okružní 31, 638 00 Brno  
 Czech Metrology 
Institute  
1. ------IND- 2018 0304 CZ - EN- ------ 20180712 --- --- PROJET 
Executive summary for the EC (not part of this legislation)  
Measuring devices for determining the load per axle for road vehicles 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 applies 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 legally cont rolled 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 Code (her einafter 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. 
D R A F T  G E N E R A L  M E A S U R E  
number:  0111 -OOP -C086 -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 instruments : 
 
'Measuring devices for determining the load per axle of road vehicles'  General measure No  0111 -OOP -C050 -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 apply:  
1.1  Basic definitions  
1.1.1  
measuring devices for determining the load per axle or wheel of road vehicles  (hereinafter 
referred to as 'devices ’) 
a measuring device used to determine the wheel load of a road vehicle using the effect of gravity on 
this vehicle; t he device has non -automatic operation with automatic balancing  
1.1.2   
wheel load  
the apparent mass of the road vehicle wheel when it is stationary and its contact surface is resting on 
the active surface of the load carrier  
1.1.3   
wheel contact surface  
the area of the tyre in direct contact with the surface of the load carrier; the size of this area depends 
on the technical dimension of the tyre (width and diameter) and its current air pressure  
1.1.4  
approach section  
the part of the surrounding terrain adj acent to the location of the device; for a device that is installed 
flush to the road (the upper surface of the load carrier is at the level of the surrounding terrain), the 
approach section is part of the device  
1.1.5  
vehicle chassis  
for the purposes of this legislation, a chassis is defined as the mechanical connection of two or three 
vehicle axles with a rigid frame or a dependent - flexible connection (for example leaf springs) in 
order to reduce the load on individual wheels or axles of the vehicle - see Figure 1.  
1.1.6   
dual wheel (dual formation)  
a dual wheel is used on a road vehicle to reduce load on the road surface by doubling its contact 
surface; instead of one wheel, two wheels are mounted next to each other (dual formation) and the axle 
has a total of four wheels  
1.2 Main parts  
1.2.1  
load receptor  
the part of the device intended to receive the load; it can be either portable - transportable (it is several 
cm in height), is intended to be placed on the road surface, or is adapted in order to be  embedded in a 
pre-prepared foundation with a frame adapted to the road surface (built -in) 
                                                      
1 TNI 01 0115 International Vocabulary o f 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.c z. General measure No  0111 -OOP -C050 -16 
3 1.2.2   
active carrier surface  
the surface of the carrier intended to bear the vehicle wheel in order to determine the vehicle's wheel 
load; in the case of transporta ble devices, it is usually permanently marked with a groove on the upper 
surface of the carrier  
1.2.3   
evaluation and indication device (EID)  
a part of the non -automatic device that processes information on the magnitude of the load  
NOTE  
In some device ve rsions the EID is integrated into the load carrier.  
 
podvozek  chassis  
Figure 1 - vehicle chassis  
 
1.3 Auxiliary elements  
1.3.1  
levelling plate  
a plate of a rigid and tough materia l (wood, metal), usually with an area the size of the transportable 
load carrier; the height of the plate must be the same as this carrier (Figure 3)  
The total number of plates (Q) used to measure a vehicle's wheel load is determined using the equation  
Q = N – A (1) 
where  N ....  the total number of the road vehicle's wheels (in this case a dual wheel is considered a 
wheel),  
A .....  the number of wheels for which the load is being measured using the device (at one 
time).  
Levelling plates are used during measurement t o keep the vehicle's wheels level.  General measure No  0111 -OOP -C050 -16 
4 1.4 Metrological characteristics  
1.4.1   
interval size for testing  
the device must be capable of setting and displaying intervals with a minimum resolution of 1/5 e 
1.4.2   
simulation test  
a test performed using a special l oading device (SLD); this is because the test cannot be performed 
using standard load weights (the size of the carrier's active surface is limited)  
1.4.3  
capacity of the device  (Lim) 
the maximum permissible load to which the device can be subjected withou t damaging it or 
permanently impairing its metrological properties; the capacity of the device ( Lim) is higher than its 
maximum capacity limit ( Max) 
2   Metrological requirements  
2.1  Accuracy class  
Accuracy classes III or IIII are specified for this devic e. 
2.2  Maximum permissible errors (MPE ) 
The maximum permissible error used for a load greater than or equal to 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 number of verification intervals e 
Class III  Class IIII  
±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  
The difference between the results of several weighings of the same load when the load is placed at 
various locations on the active surface of the load carrier must not be greater than the absolute value of 
the maximum permissib le errors ( MPE ) under Table 1 for a given load.  
2.4  Repeatability  
The difference between the results of a repeated weighing of the same load placed on the load carrier 
under the same conditions must not be greater than the absolute value of the maximum pe rmissible 
errors ( MPE ) under Table 1 for a given load.  General measure No  0111 -OOP -C050 -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 w ith the appropriate 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 t o 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. 
3.2   Installation conditions  
3.2.1    Installation conditions for a built -in carrier  
The term built-in load carrier  is also used for a transportable (portable) device if it is placed in the 
terrain on a bed built for measurement purposes.  
The load carrier is installed flush to the terrain so that the upper surface of the carrier is at the level of 
the surrounding terrain (see Figure 2).  
The surrounding terrain (the approach section)  in front of and b ehind the load carrier surface, over 
the length of the longest wheelbase (L) of the measured vehicle's chassis and the width of the load 
carrier - in the direction of the vehicle's movement - must be adapted so that it is installed at a non -
freezing depth and the absolute value of deviation from the level of the entire measurement section 
does not exceed 2 mm.  
The measurement section must be sufficiently rigid so that no mechanical changes occur that may 
have a negative impact on measurement results for the  period during which the device's verification is 
valid.  
The load carrier must be waterproof or have a drained base so that elements with a significant effect 
on the measurement signal are functional for the entire period during which the device's verifica tion is 
valid.  
The load carrier must be suitably protected from overloading, i.e. from a load greater than the 
measuring instrument's maximum capacity Max. General measure No  0111 -OOP -C050 -16 
6 
podvozek vozidla
L
L1
měřicí úsek (vážicí zóna)přibližovací úsekměřicí zařízení 
podvozek vozidla  vehicle chassis  
měřicí zařízení  measuring device  
měřicí úsek (vážicí zóna)  meas uring section (weighing zone)  
přibližovací úsek  approach section  
Figure 2 - Measuring section of the device  
3.2.2    Conditions for transportable device installation  
The load carrier (or the device, if the carrier is part thereof) is situated on the road (terrain) so that its 
upper surface is above the surrounding terrain.  
The load carrier must be equipped with a spirit level or must be designed so that in the case of a 5 % 
incline the load indication error does not exceed the value of the maximum permissi ble error ( MPE ) 
for the given accuracy class and given load.  
The carrier must be designed so that when the vehicle drives over its constituent parts it does not tilt or 
shift and thus cause possible errors greater than the values of the maximum permitted e rrors ( MPE ). 
All wheels (dual wheels) of the measured road vehicle must be at the same level during measurement 
(see Figure 3).The measured wheel (dual wheel) rests on the active surface of the load carrier and 
other wheels (dual wheels) are supported by t he levelling plates.If levelling plates are not used during 
measurement, the measurement results are subject to excessive errors depending, among other things, 
on the length of the chassis, vehicle weight, and vehicle height (change of the vehicle's centre  of 
gravity).  General measure No  0111 -OOP -C050 -16 
7 
 
Figure 3 - Use of the device and levelling plates  
where  A .........   active support (load carrier, device)  
B .........   levelling plate  
4   Markings  
4.1   Descriptive markings  
Scales m ust 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 manufacturer ’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 w here 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 maximum additive tare effect, in the form 'T = + ...';  
k) the ma ximum 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 -C050 -16 
8 5  Type approval of the measuring instrument  
These measuring instruments are placed on the market and into service with a conformity assessm ent 
in accordance with the Government Regulation on non -automatic weighing instruments2, meaning that 
they are not subject to type approval.  
6  Initial verification  
These measuring instruments are placed on the market 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  General conditions  
Devices are tested in  the laboratory using a standard loading device (SLD).  
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 text does not exceed  one fifth of the 
temperature range of the given device or 5 °C, whichever is less, 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.  
7.2  Standard refer ences  
7.2.1   Standard loading device (SLD)  
The standard loading device must make gradual loading possible.  
7.2.1.1   SLD work surface  
The SLD must be adapted to accommodate the tested transportable device so that a load can be 
exerted at various locations o n the active carrier surface.  
7.2.1.2  Contact surface  
The load transferred from the SLD to the tested load carrier must be distributed over an area 
equivalent to the contact surface of a truck tyre with the road surface when the tyre is pressurised to a 
nominal pressure under the relevant regulations.  
There must be a flexible part between the metal part of the SLD and the tested load carrier that 
simulates the physical characteristics of the tyre.  
                                                      
2 Government Regulation No  121/2016 on conformity assessment of non -automatic weighing instruments when 
being made available on the market.  General measure No  0111 -OOP -C050 -16 
9 7.3  Loading rate  
Delays between individual load levels mus t be sufficient to allow the operator to accurately read the 
indication for individual loads.  
7.4  Weighing test  
One set of measurements is performed for loading and unloading with at least five load values, 
including zero, Min, Max, and points where the v alue 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.  
7.5  Repeatability test  
One set of weight measurements must be performed with a load clo se to 0.8 times the maximum 
capacity ( 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 load.  
7.6  Error evaluation  
If the interval val ue can be reduced to at least e/5, the device error is calculated using the following 
formula:  
E = IZ – L (2) 
where  IZ .........   is the measuring instrument indication under load  
L ..........   the nominal load value indicated by the SLD.  
None of the determined device errors ( E) may exceed the value of the maximum permitted error 
(MPE ) as per Table 1.  
8  Measuring instrument re -test at the request of the persons 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 double the maximum permissible errors 
(MPE ) specified in Table 1.  
9  Notified standards  
For the purposes of specifying th e metrological and technical requirements for measuring instruments 
and specifying the testing methods for their verification stemming from this general measure, the CMI 
shall notify Czech technical standards, other technical standards or technical documen ts 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 
notified standards attached to the relevant m easures, 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 ge neral 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 testin g methods for their type approval and verification stemming from this general General measure No  0111 -OOP -C050 -16 
10 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 referred 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 p ublic (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 by using another technical solution guaranteeing an 
equivalent or high er 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 of § 6(2), § 9(1) 
and (9) as well as §  11a(3) of the Metrology Act, this general measure laying down the metrolo gical 
and technical requirements for the specified measuring instruments and for the verification of 
specified measuring instruments - 'Measuring devices for determining the load per axle of road 
vehicles'.  
Implementing Decree No 345/2002 specifying measur ing instruments for mandatory verification and 
measuring instruments subject to type approval, as amended, classifies the measuring instruments 
under item  2.1.5 b) in the annex entitled ‘List of legally controlled measuring instruments ’ as 
measuring instru ments subject to type approval and mandatory verification.  
This legislation (general measure) will be notified in accordance with Directive (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 accordance 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.  
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 sh all 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. Sai d comments must also identify the administrative authority to which they are 
addressed and be signed by the person making them.  
The supporting documents for this draft general measure may be consulted at the Czech Metrology 
Institute, Legal Metrology Depar tment, Okružní 31, 638 00 Brno, after making arrangements by 
telephone.  
This general measure shall be posted for 15  days.  
 
 General measure No  0111 -OOP -C050 -16 
11  
 ................................ ................................ ..  
RNDr.  Pavel Klenovský  
Director -General  
Person responsible for accuracy:  Mgr.  Tomáš Hendrych  
 
Posted on:  12 April  2018  
Signature o f the authorised person confirming posting:....................................................  
 
Removed on:  
Signature of the authorised person confirming removal:....................................................