The Czech Metrology Institute  
Okružní 31, 638 00 Brno  
 
1. ------IND- 2015 0549 CZ - EN- ------ 20151009 --- --- PROJET 
 
Executive summary for the European Commission (not part of this legislation)  
In the Czech Republic, automatic weighing instruments are placed on the market and into use purs u-
ant to Directive  2004/22/EC (MID). Once they have been put into use, they become subject to natio n-
al metrological regulation – verification (at specified intervals). This notified legislation only applies 
to the verification of measuring instruments that have already been p ut into use. It does not concern 
placing them on the market or putting them into use (with the exception of cases pursuant to Art i-
cle 23 of the MID).  
The requirements imposed on these measuring instruments when in use are fully compatible with the 
MID and are also based on recommendations of OIML R  51-1. 
Some parameters specified in this document are properties of measuring instruments in new cond i-
tions and are provided only because the preservation of these properties when the instrument is in use 
is subje ct to visual or other checks within the scope of verification.  
(End of executive summary.)  
REF.  No: 0313/003/15/Pos.  
Compiled by: Ing. Miroslav Pospíšil  
Telephone: 545  555 135, -131 
As the authority with substantive and territorial jurisdiction in the mat ter of laying down metrological 
and technical requirements for specified measuring instruments and stipulating test methods for type 
approval and verification of specified measuring instruments pursuant to §  14(1) of Act No  505/1990, on 
metrology, as amend ed (hereinafter the “Metrology Act”), and in accordance with the provisions of 
§ 172 et seq. of Act No  500/2004, the Administrative Code (hereinafter the “AC”), the Czech Metrology 
Institute (hereinafter the “CMI”) commenced ex officio proceedings on 2   July  2015 pursuant to §  46 of 
the AC, and based on the supporting documents, hereby issues the following:  
I. 
M E A S U R E  O F  A  G E N E R A L  N A T U R E  
 
number: 0111 -OOP -C052-15 
Ref. No  0313/003/15/Pos.,  
 
laying down metrological and technical requirements for specified m easuring instr u-
ments, including test methods for the verification of specified measuring instruments:  
“automatic weighing instruments – catch -weighing instruments”  Measure of a General Nature No  0111 -OOP -C052-15 
2 This Measure of a General Nature stipulates metrological and technical requirements for auto matic 
weighting instruments – catch -weighing instruments, which are applied after they are placed on the 
market or put into use during their verification. These requirements are in accordance with requir e-
ments of Government Order No  464/2005, which stipula tes technical requirements for measuring i n-
struments1), as amended (hereinafter the “Government Order on Measuring Instruments”) and with 
requirements of harmonised OIML standards/documents.  
The verification of automatic weighing instruments type approved under the Metrology Act effective 
until 30  October  2006, i.e. prior to the transposition of Directive  2004/22/EC of the European Parli a-
ment and of the Council, as amended, into Czech law, shall be subject to metrological requirements 
applicable at the time  they were put into circulation.  
1 Basic definitions  
The terms and definitions pursuant to the VIM a VIML2) as well as the terms and definitions specified 
in the following shall apply for the purposes of this Measure of a General Nature:  
1.1 
weighing instr uments   
weighing equipment that serves to determine the mass of an object, liquid  or loose substance utilising 
the effect of gravity on this object, liquid  or loose substance  
1.2 
automatic weighing instrument   
weighing equipment that requires no operator i ntervention and/or follows a pre -set automatic process 
program me that is characteristic for the given weighing instrument  
1.3 
automatic catch -weighing instruments   
automatic weighing equipment that determines the mass of pre -aggregated independent loads (f or 
example pre -packaged goods) or individual amounts of loose material  
1.4 
automatic weight checking instruments; sorting weighing instruments   
automatic weighing instruments that sort goods of various mass into two or more independent subsets 
according to  the value of the difference between their mass and a nominal set point  
1.5 
labelling weighing instruments   
automatic catch -weighing instruments that apply a label with the weight value to individual pieces of 
goods  
1.6 
weighing instruments with printing o f price labels   
automatic catch -weighing instruments that apply a label with the weight value and price information to 
individual pieces of goods  
                                                      
1)  This Government Order implements Directive  2004/22/EC of th e European Parliament and of the Council of 
31 March  2004 on measuring instruments, as amended.  
2)  International Vocabulary of Metrology – Basic and General Concepts and Associated Terms (VIM) and 
International Vocabulary of Terms in Legal Metrology (VIML ) are part of the technical harmonisation compe n-
dium “Terminology in the Area of Metrology”, which is publicly accessible at www.unmz.cz.  Measure of a Gen eral Nature No  0111 -OOP -C052-15 
3 2 Metrological requirements  
Metrological requirements are based on the requirements of the Government Order on  Measuring I n-
struments and utilising relevant requirements of recommendations of - OIML R 51 -1 Automatic catch -
weighing  instruments  – Part 1: Metrological and technical requirements – Tests 3). 
Measuring instruments type approved pursuant to the Metrology Act shall be subject to the metrolog i-
cal requirements applicable at the time they were put into circulation.  
2.1 Rated operating conditions  
The manufacturer specifies rated operating conditions, where the minimum operating temperature 
range is 30  °C. 
For o ther influencing variables (if applicable):  
a) operating speed(s);  
b) properties of the weighed product.  
2.2 Measuring range  
The measuring range is expressed as maximum and minimum weighing capacity.  
2.3 Accuracy classes  
Automatic catch -weighing instruments are classified into primary categories designated as:  
X or Y, according to the manufacturer's specifications;  
where these primary categories are further broken down into four accuracy classes:  
XI, XII, XIII, and  XIV; and  
Y(I), Y(II), Y(a), and  Y(b), which are stipulated by the manufacturer.  
2.3.1  Category X weighing instruments  
2.3.1.1  Category X includes weighing instruments used to check pre -packaged products pursuant to 
requirements of special legislation4). 
2.3.1.2  Accuracy classes are supplemented by a fac tor ( x) that  specifies the maximum permitted 
standard deviation pursuant to Article  2.4.2.  
The manufacturer must specify the factor ( x), which must be  2 and expressed in the form 1  × 10k, 
2 × 10k, or 5  × 10k, where k is a negative whole number or zero.  
2.3.2 Category Y weighing instruments  
Category Y includes all other automatic catch -weighing instruments.  
2.4 Accuracy of automatic catch -weighing instruments  
2.4.1  Maximum permissible errors  
During verification, maximum permissible errors pursuant to Table  1 are used.  
                                                      
3) OIML  R 51-1 “Automatic catchweighing instruments  – Part 1: Metrological and technical requirements  – 
Tests” – publi cly available at  www.oiml.org  
4)  Decree No  328/2000, on the method used to manufacture certain types of pre -packaged goods whose 
amount is expressed in units of mass or volume.  Measure of a General Nature No  0111 -OOP -C052-15 
4 The maximum permissible error for category X weighing instruments is stipulated at the largest pe r-
missible mean error, and for category Y as the maximum permissible error according to Table  1. 
Table  1 – Maximum permitted errors for verificatio n 
Net load (m) expressed using verification divisions  (e) Maxi-
mum 
permiss i-
ble mean 
error  Maxi-
mum 
permi s-
sible 
error  
XI Y(I) XII Y(II) XIII Y(a) XIV Y(b)  X Y 
0 < m < 50 000 0 < m < 5 000 0 < m < 500 0 < m < 50 +0.5e +1e 
50 000 < m < 200 000 5 000 < m < 20 000 500 < m < 2 000 50 < m < 200 +1.0e +1.5e 
200 000 < m 20 000 < m < 100 000 2 000 < m < 10 000 200 < m < 1 000 +1.5e +2e 
2.4.2  Maximum permissible errors during operation  
When weighing instruments are being checked while in use or during re -testing o f a specified measu r-
ing instrument performed pursuant to §  11a(1) of the Metrology Act upon request by a subject that can 
be affected by incorrect measurement, the maximum permissible operating errors listed in Table  2 are 
used.  
Table  2 – Maximum permitted  errors during operation  
Net load (m) expressed using verification divisions  (e) Maxi-
mum 
permiss i-
ble mean 
error  Maxi-
mum 
permi s-
sible 
error  
XI Y(I) XII Y(II)  XIII Y(a) XIV Y(b)  X Y 
0 < m < 50 000 0 < m < 5 000 0 < m < 500 0 < m < 50 +1e +1.5e 
50 000 < m < 200 000 5 000 < m < 20 000 500 < m < 2 000 50 < m < 200 +2e +2.5e 
200 000 < m 20 000 < m < 100 000 2 000 < m < 10 000 200 < m < 1 000 +3e +3.5e 
Standard deviations for class X weighing instruments ( x) 
The maximum permissible standard deviation for clas s X weighing instruments ( x) is obtained by mu l-
tiplying the coefficient ( x) by the value in Table  3. 
Table  3 - Maximum permissible standard deviation for class X(I)  
Net load  (m) Maximum permissible standard 
deviation for class X(I)  Maximum permissible stan dard deviation 
for class X(I) during operation  
m  50 g 0.48 % 0.6 % 
50 g  m  100 g 0.24 g 0.3 g 
100 g  m  200 g 0.24 % 0.3 % 
200 g  m  300 g 0.48 g 0.6 g 
300 g  m  500 g 0.16 % 0.2 % 
500 g  m  1 000 g 0.8 g 1.0 g 
1 000 g  m  10 000 g 0.08 % 0.1 % 
10 000 g  m  15 000 g 8 g 10 g 
15 000 g  m 0.053  % 0.067  % Measure of a Gen eral Nature No  0111 -OOP -C052-15 
5 For class XI and XII, ( x) must be less than 1.  
For class XIII, ( x) must not be greater than 1.  
For class XIV, (x) must be greater than 1.  
2.5 Verification division  
2.5.1  Single -range weighing instruments  
Table  4 – Verification division for single -range weighing instruments  
Accuracy classes  Verification division  Number of verification divisions n = Max/ e 
Minimum  Maximum  
XI Y(I) 0.001  g ≤ e 50 000 – 
XII Y(II)  0.001  g ≤ e ≤ 0.05  g 100 100 000 
0.1 g ≤ e 5 000 100 000 
XIII Y(a) 0.1 g ≤ e ≤ 2 g 100 10 000 
5 g ≤ e 500 10 000 
XIV Y(b)  5 g ≤ e 100 1 000 
 
2.5.2  Multi -range weighing instruments  
Table  5 – Verification division for multi -range weighing instruments  
Accuracy classes  Verification division  Number of verification divisions  
n = Max/ e 
Minimum value1) 
n = Max i/e(i+1) Maximum value  
n = Max i/ei 
XI Y(I) 0.001  g ≤ ei 50 000 – 
XII Y(II)  0.001  g ≤ ei ≤ 0.05  g 5 000 100 000 
0.1 g ≤ ei 5 000 100 000 
XIII Y(a) 0.1 g ≤ ei 500 10 000 
XIV Y(b)  5 g ≤ ei 50 1 000 
The following applies:  
i = 1, 2, … r 
i = individual weighing range  
r = total number of weighing ranges  
1) For i = r, the corresponding column in Table  3 is used, with  e being replaced by  er. 
 
2.6 Weighing range  
When st ipulating the weighing range for class Y weighing instruments, the manufacturer must take 
into account that the minimum weighing capacity must not be less than  
class Y(I):  100e 
class Y(II):  20e  for 0.001  g  e  0.05 g,  50e  for 0.1 g  e 
class Y(a):  20e Measure of a General Nature No  0111 -OOP -C052-15 
6 class Y(b):  10e 
Sorting weighing instruments, for example postal weighing instruments and weighing instruments for 
weighing waste:  5e 
2.7 Dynamic configuration  
2.7.1  Dynamic configuration equipment must operate within the load range stipulated by the man u-
facturer.  
2.7.2  After installation, dynamic configuration equipment that compensates the dynamic effects of 
moving loads must not be active outside the load range, and it must be possible to secure it.  
2.8 Indication limits  
Category Y: Indication, printing , storage, or transmission of weighing values over Max  + 9e must be 
prevented.  
Category X: Indication, printing, storage, or transmission of weighing values over Max  + 9e or Max + 
triple the maximum permissible standard deviation must be prevented.  
2.9 The influence of zero deviation  
After zeroing, the influence of zero deviation must be greater than 0.25 e. 
2.10 Taring accuracy  
Equipment for tare setting must make it possible to set zero with a deviation of no greater than 0.25 e. 
For weights with multiple s eparations, e is replaced by  e1. 
3 Technical requirements  
Technical requirements are based on the requirements of the Government Order on Measuring Instr u-
ments and utilising relevant requirements of recommendations of - OIML R 51 -1 Automatic catc h-
weighing  instruments  – Part 1: Metrological and technical requirements – Tests3). 
Measuring instruments type approved pursuant to the Metrology Act shall be subject to the metrolog i-
cal requirements applicable at the time they were put into circulation.  
3.1 To rest rict the influence of tilting, loading and operating speed, means must be available to ensure 
that maximum permissible errors will not be exceeded under normal operating conditions.  
3.2 Appropriate control equipment must be provided to ensure that the weig hing instrument will ope r-
ate within the limits of maximum permissible errors under normal conditions.  
3.3 Every control interface must be clear and effective for the operator.  
3.4 The operator must be able to verify the integrity of the indicator (if any).  
3.5 Appropriate means of zeroing the indicator must be available to ensure that the weighing instr u-
ment will operate within the limits of maximum permissible errors under normal conditions.  
3.6 Units of measurement are the kilogram  (kg), tonne (t), gram  (g), milligram  (mg) or metric carat (ct).  
3.7 Weighing results must include names or markings of the units of mass in which they are e x-
pressed. The scale division value of indicators and printers must be in the form 1  × 10k, 2 × 10k or 
5 × 10k units, in whi ch the result is expressed, where the index k is a positive or negative whole nu m-
ber, or is equal to zero.  Measure of a Gen eral Nature No  0111 -OOP -C052-15 
7 3.8 Weighing instruments must be secured against fraudulent use. Components that the user is not 
allowed to disassemble or adjust must be secured to prevent such activity.  
4 Measuring instrument marking  
4.1 Measuring instrument markings  
Weighing instruments must have the following markings:  
– the trade mark or name of the manufacturer;  
– serial number and type,  
– the number of the type approval certificate, if available;  
– accuracy class, for example as follows: XI(0.5) or Y(a);  
– the verification division of the scale in the form: e = …….;  
– the true division of the scale in the form: d = …….;  
– maximum weighing capacity in the form: Max..…;  
– minimum weighing capacit y in the form: Min…..;  
– maximum additive tare in the form: T = +  ; 
– maximum subtractive tare in the form: T = –  ; 
– product labelling;  
– temperature range ...... °C / ...... °C;  
– power .......  V; 
– power frequency .... Hz;  
– maximum performance (if applicable) in the form: ……load per minute or units/min.  
The plate bearing mandatory markings must be sealed or must be impossible to remove without d e-
stroying it.  
4.2 Official mark placement  
Official marks must be placed so that after their installation, the weighing in strument cannot be adjus t-
ed or components cannot be accessed for which this is forbidden. Marks must be designed so that they 
cannot be removed without damaging or destroying them.  
Placement of official marks is stipulated in the type approval certificate or the EC type -examination 
certificate or other document or activity applied within the context of conformity assessment when 
placing the device on the market and putting it into use.  
5 Measuring instrument type approval  
Automatic weighing instruments - catch-weighing instruments  are placed on the market and into service 
with a conformity assessment pursuant to the Government Order on Measuring Instruments, and are ther e-
fore not subject to type approval.  
6 Initial verification  
During initial verification af ter measuring instrument repair, a procedure identical to that used for su b-
sequent verification pursuant to Chapter  7 is applied.  Measure of a General Nature No  0111 -OOP -C052-15 
8 7 Subsequent verification  
Subsequent verification, i.e. any verification of the measuring instrument conducted after prior ver ifi-
cation or conformity assessment and, if applicable, verification pursuant to §  11a(1) of the Metrology 
Act, shall be carried out in accordance with this measure regardless of whether the instrument was 
placed on the market and put into circulation pursu ant to the Metrology Act or pursuant to the Go v-
ernment Order on Measuring Instruments.  
The same metrological requirements that were decisive in placing a weighing instrument on the ma r-
ket will be applied during its verification.  
7.1 Test overview  
Each veri fication consists of the following actions and tests:  
a) visual inspection;  
b) accuracy test;  
– weighing test;  
– eccentricity test.  
7.2 Visual inspection  
The following are assessed during a visual inspection of a catch -weighing instrument:  
– that the measuring instrum ent presented for verification complies with the approved type or 
design of the measuring instrument for which conformity was declared in the context of its 
placement on the market, and markings pursuant to Chapter  4 must be checked;  
– the measuring instrume nt is not mechanically damaged and its metal parts do not have traces 
of corrosion that could have an adverse effect on its function.  
– after zeroing or taring, deviation from zero meets the requirements of Article  2.9 or 2.10.  
If the measuring instrument fa ils to meet visual inspection requirements, no further tests are pe r-
formed.  
7.3 Test conditions and equipment  
7.3.1  The weighing instrument must be complete and installed in a position for intended use under 
typical operating conditions. Tests must be perf ormed within the scope stipulated by its designation 
using a product or products that are or will be weighed during operation.  
7.3.2  Test equipment - a reference weighing instrument must permit the true mass value of every 
test load to be determined with a ccuracy of at least 1/3 applicable to the maximum permissible error for 
automatic weighing listed in Article  2.4.1.  
The error of reference weights must not exceed 1/3 of the maximum permissible error for the given 
load.  
7.3.3  If necessary, the reference we ighing instrument must be checked immediately after the tests 
are performed to determine whether its characteristics have not changed. If the reference weighing 
instrument does not have a suitable scale division size, suitable resolution can be ensured usi ng auxi l-
iary loads to determine the tipping point. It must be ensured that the reference weighing instrument 
can be used to weigh all test of the given product.  
7.3.4  The load transport system must be set to its maximum speed, and if user -adjustable, also to 
approximately the mean speed value. If a speed value applies to a certain product, the speed must be 
set for that given product.  Measure of a Gen eral Nature No  0111 -OOP -C052-15 
9 7.3.5  The weighing instrument must be set to zero prior to the start of each test.  
Dynamic configuration must be set accordi ng to the manufacturer's instructions prior to each test.  
7.3.6  Indication and/or printing of mass values (or the difference between mass and the nominal set 
point) must be available for each load in order the determine errors and deviations (by category).  Er-
rors and deviations must be calculated for the number of individual loads specified in Table  6. 
Table  6 – Number of test weighs  
Category  Load  Number of test weighs  
X m  1 kg 60 
1 kg < m  10 kg 30 
10 kg < m  20 kg 20 
20 kg < m 10 
Y At least 10  for all loads  
 
Category Y weighing instruments  
If the weighing instrument has a device to indicate the true scale division d ≤ 0.2e, this device must be 
used to determine error.  
If the true scale division value is greater than 0.2 e, rounding error must be eliminated through load 
selection.  
7.4 Accuracy test  
7.4.1  Weigh test - in automatic mode  
A weigh test in automatic mode cons ists of the following steps:  
– select four test loads, which must include values near Min and Max and values near to but not 
greater than critical points within the Min and Max range (where maximum permissible errors  
change);  
– determine the mass of the test l oads on the verification weighing instrument;  
– the number of test weighs for each load is specified in Table  6; 
– weigh the test loads according to Table  6 in automatic mode;  
– determine and evaluate individual measurement errors for the given weighing instrume nt ca t-
egory.  
Measuring errors must not exceed maximum permitted errors listed in Article  2.4.1 for verification or 
Article  2.4.2 for checking weighing instruments in operation or re -testing of a specified measuring 
instrument pursuant to §  11a(1) of the Me trology Act.  
7.4.2  Eccentricity test  
7.4.2.1  Eccentricity test in dynamic mode  
Equipment for setting and monitoring the zero point must be active. Dynamic configuration may be 
performed prior to each new test load.  
An eccentricity test in dynamic mode cons ists of the following steps:  
– apply a load equal to 1/3 Max (plus additive tare, if applicable) in the following load carrier 
sections/bands:  Measure of a General Nature No  0111 -OOP -C052-15 
10 – band 1 extends from the centre of the load carrier to one edge of the transport system;  
– band 2 extends from the cen tre of the load carrier to the opposite edge of the transport sy s-
tem; 
– perform the number of test weighs specified in Table  6. 
Measurement errors must not exceed corresponding maximum permissible errors for the given categ o-
ry of weighing instruments pursuan t to Article  2.4.1.  
7.4.2.1  Eccentricity test - for static weighing instruments  
An eccentricity test in static mode consists of the following steps:  
– apply a load equal to1/3 Max (plus additive tare, if applicable) in each of four load carrier se g-
ments;  
– for load carriers with n support points with  n > 4, apply a load of 1/( n – 1) Max to each su p-
port point (plus additive tare , if applicable ); 
– determine and evaluate individual measurement errors for the given weighing instrument ca t-
egory.  
Measurement errors mu st not exceed corresponding maximum permissible errors for the given categ o-
ry of weighing instruments pursuant to Article  2.4.1.  
8 Notified standards  
For the purposes of specifying metrological and technical requirements for measuring instruments and 
speci fying test methods for verification arising from this Measure of a General Nature, the CMI shall 
provide notification of Czech technical standards, other technical standards, or technical documents of 
international or foreign organisations, or other techni cal documents containing more detailed technical 
requirements (hereinafter “notified standards”). The CMI shall publish a list of these notified standards 
attached to the relevant measures, together with the Measure of a General Nature, in a manner access i-
ble to the public (on www.cmi.cz ). 
Compliance with notified standards or parts thereof shall be considered, to the extent and under the 
conditions laid down in a Measure of a General Nature, as compliance with those requi rements laid 
down in this measure to which these standards or parts thereof apply.  
 
 
II. 
J U S T I F I C A T I O N  
The CMI issues, pursuant to §  14(1)(j) of the Metrology Act, towards the implementation of §  9(1), 
§ 9(9) and §  11a(3) of the Metrology Act, this Measure  of a General Nature, stipulating metrological 
and technical requirements for specified measuring devices and test methods for verification of these 
specified measuring devices  
In Decree No  345/2002, specifying measuring instruments for mandatory verificat ion and measuring 
instruments subject to type approval, as amended, the annex “List of Specified Measuring Device 
Types” classifies automatic weighing instruments under Item  2.1.3, and gravimetric filling and catch 
weighers under e) as measuring instrument s subject to type approval and verification.  
The CMI thus issues, towards the implementation of §  9(1), §  9(9) and §  11a(3) of the Metrology Act, 
for the measuring instrument type specified as “automatic weighing instruments – catch -weighing 
instruments ,” this Measure of a General Nature, stipulating metrological and technical requirements 
for automatic weighing instruments – catch -weighing instruments and test methods for type approval 
and verification of these specified measuring instruments.  Measure of a Gen eral Nature No  0111 -OOP -C052-15 
11 This regulat ion (Measure of a General Nature) has been notified in accordance with D i-
rective  98/34/EC of the European Parliament and of the Council of 22  June 1998 on the procedure for 
the provision of information in the field of technical standards and regulations an d of rules on Info r-
mation Society services, as amended.  
 
 
III. 
I N S T R U C T I O N S  
A Measure of a General Nature cannot be appealed (§  173(2) of the Administrative Code).  
Pursuant to §  172(5) of the Administrative Code, a decision on objections cannot be appealed . 
Compliance of the Measure of a General Nature with legislation may be subject to a review process pu r-
suant to §  94 to §  96 of the Administrative Code . A party to the proceedings may initiate review pr o-
ceedings to be conducted by the administrative author ity that issued this Measure of a General Nature. If 
the administrative authority finds no reason to commence review proceedings, it shall communicate and 
provide grounds for this to the submitter within 30 days. Pursuant to §  174(2) of the Administrative 
Code, a ruling on the commencement of review proceedings can be issued within three years of the 
effective date of the Measure of a General Nature.  
 
 
IV. 
E F F E C T I V E  D A T E  
This General Measure takes effect on the fifteenth day following the date of its publication (§  24d of 
the Metrology Act).  
 
 
 
...…………………………..............  
RNDr. Pavel Klenovský  
Director General