Czech Metrology Institute  
 
Okružní 31, 638 00 Brno  
 
1. ------IND- 2015 531 CZ - EN- ------ 20151005 --- --- PROJET 
 
Executive summary for the Commission (not part of this legislation)  
The placing on the market and putting into use in the Czech Republic of automatic weighing 
instruments is governed by Directi ve 2004/22/EC (MID). Once they have been put into use, they 
become subject to national metrological regulation – verification (at specified intervals). The 
legislation which is the subject of this notification only applies to the verification of measuring 
instruments that have already been put into use. It does not concern their placing on the market or 
putting into use (with the exception of the cases referred to in Article  23 of the MID).  
The requirements imposed on these measuring instruments when in ser vice are fully compatible with 
the MID and also stem from the recommendations under OIML  R 50-1. 
Some parameters specified in this document are properties of measuring instruments in new condition 
and are provided only because the preservation of these pro perties when the instrument is in use is 
subject to visual or other checks within the scope of verification.  
(End of executive summary.)  
Ref. No: 0313/006/15/Pos.  
Contact person: Ing. Miroslav Pospíšil  
Telephone: 545  555 135, -131 
As the authority with su bstantive and territorial jurisdiction in the matter of laying down metrological 
and technical requirements for legal measuring instruments and laying down the methods for type 
approval and verification of legal measuring instruments under §  14(1) of Act N o 505/1990 on 
metrology, as amended (hereinafter the “Metrology Act”), and in accordance with the provisions of 
§ 172 et seq. of Act No  500/2004, the Code of Administrative Procedure (hereinafter the “CAP”), the 
Czech Metrology Institute (hereinafter the “ CMI”) commenced ex officio proceedings on 2  July 2015 
under §  46 of the CAP and, based on the supporting documents, hereby issues the following:   
 
 
I. 
G E N E R A L  M E A S U R E  
 
number: 0111 -OOP -C055 -15 
Ref. No  0313/006/15/Pos.,  
 
laying down metrological and technic al requirements for legal measuring instruments, 
including the tests for the verification of legal measuring instruments:  General Measure No  0111 -OOP -C055-15 
2 “automatic weighing instruments - continuous totalisers”  
 
This General Measure lays down the metrological and technical requirements f or automatic weighing 
instruments – continuous totalisers to be applied in the verification of these instruments after they have 
been placed on the market or put into use. These requirements comply with the requirements of 
Government Regulation No  464/2005  laying down the technical requirements for measuring 
instruments1), as amended (hereinafter the “Government Regulation on Measuring Instruments”) and 
the requirements of harmonised standards/OIML documents.  
The verification of automatic weighing instrumen ts 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 
Parliament and of the Council, as amended, into Czech law, shall be subject to metrological 
requirements appli cable at the time they were put into circulation.  
1 Definitions  
For the purposes of this General Measure, the terms and definitions according to VIM and VIML2) and 
the terms and definitions below shall apply.  
1.1 
weighing  instrument  
a weighing device servi ng to determine the mass of a body or dry material by using the action of 
gravity on that body or dry material  
1.2 
automatic weighing instrument  
a weighing device that weighs without the intervention of an operator and/or follows a predetermined 
programme of automatic processes characteristic of the weighing instrument  
1.3 
continuous totalisers; belt weighers  
an automatic weighing device that continuously determines the mass of a product on a conveyor belt, 
without systematic subdivision of the product and without interrupting the movement of the conveyor 
belt 
2 Metrological requirements  
The metrological requirements are based on the requirements of the Government Regulation on 
Measuring Instruments, applying the relevant requirements under OIML Recommendati on R  50 
Continuous totalising automatic weighing instruments (belt weighers) – Part 1: Metrological and 
technical requirements3). 
Measuring instruments type approved prior to the entry into force of the Metrology Act shall be 
subject to the metrological re quirements applicable at the time they were put into circulation.  
                                                      
1)  This Government Regulation implements Directive  2004/22/EC of the European Parliament and of the 
Council of 31  March  2004 on measuring instruments, as amended, into Czech legislation . 
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 
compendium “Terminology in the Area of Metrology”, which i s publicly accessible at www.unmz.cz.  
3)  OIML  R 50-1 “Continuous totalizing automatic weighing instruments (belt weighers)  – Part 1: Metrological 
and technical requirements“ – publicly available at  www.oiml.org  General Measure No  0111 -OOP -C055 -15 
3 2.1 Rated operating conditions  
The rated operating conditions for continuous totalisers shall be established by the manufacturer with 
the minimum operating temperature range being 30  °C. 
For other influence quantities (if applicable):  
a) the rate(s) of operation;  
b) the characteristics of the product to be weighed.  
2.2 Measuring range  
The measuring range shall be expressed in terms of the maximum and minimum capacity.  
2.3 Accuracy classes  
The weigh ing instruments are divided into three accuracy classes as follows: 0.5;  1 and  2. 
2.4 Maximum permissible errors  
2.4.1  Maximum permissible error in verification  
In verification, the maximum permissible errors referred to in Table  1 shall apply.  
Table 1  – Maximum permissible errors of totalised loads  
Accuracy class  Maximum permissible error of totalised load  
0.5 ±0.25  % 
1 ±0.5 % 
2 ±1.0 % 
 
2.4.2  Maximum permissible in -service errors  
When inspecting weighing instruments in service or carrying out verificat ion of legal measuring 
instruments in accordance with §  11a(1) of the Metrology Act at the request of a person who may be 
affected by incorrect measurement, the maximum permissible in -service errors referred to in Table  2 
shall be applied.  
Table 2  – Maximu m permissible in -service errors of totalised loads  
Accuracy class  Maximum permissible error of totalised load  
0.5 ±0.5 % 
1 ±1.0 % 
2 ±2.0 % 
 
2.4.3  Maximum permissible zero -load error  
The maximum permissible errors for zero indication change and maximum change in the totalising 
indicating device readings at zero load are provided in Tables  3 and 4.  
Table 3  – Maximum permissible errors for zero indication change  
Accuracy class  Maximum permissible error for zero indication 
change  General Measure No  0111 -OOP -C055-15 
4 0.5 ±0.05  % 
1 ±0.1 % 
2 ±0.2 % 
 
Table  4 – Maximum permissible errors for maximum change in indication of a totalising 
indicating device  
Accuracy class  Maximum permissible error for maximum change 
in indication of a totalising indicating device  
0.5 ±0.175  % 
1 ±0.35  % 
2 ±0.7 % 
2.5 Measurement range  
2.5.1  The manufacturer shall specify the measurement range, the ratio between the minimum net 
load on the weighing unit and the maximum capacity, and the minimum totalised load.  
2.5.2  Minimum totalised load Σmin shall be not less than the largest of the following values:  
– 2 % of the load totalised in one hour at maximum flow -rate; 
– the load obtained at maximum flow -rate in one revolution of the belt;  
– the load corresponding to the appropriate number of verificat ion intervals in Table  5. 
Table  5 – Number of scale intervals of the totaliser  
Accuracy class  Number of intervals  
0.5 800 
1 400 
2 200 
 
2.6 Speed of the belt  
The speed of the belt shall be specified by the manufacturer. For single -speed belt weighers an d 
variable -speed belt weighers having a manual speed setting control, the speed shall not vary by more 
than 5  % of the nominal value. The product shall not have a different speed than the speed of the belt.  
2.7 General totalisation device  
It shall not be p ossible to reset the general totalisation device to zero.  
2.8 Maximum flow -rate, Qmax 
The flow -rate obtained with the maximum capacity of the weighing unit and the maximum speed.  
2.9 Minimum flow -rate, Qmin 
2.9.1  Single -speed belt weighers  
The minimum flow -rate shall be equal to 20  % of the maximum flow -rate. This shall apply provided 
that the characteristics of the installation are such that the flow -rate variation is less than a ratio of 5:1, General Measure No  0111 -OOP -C055 -15 
5 exclusive of the flow -rate gradient at the beginning and the en d of the conveyance of the product. 
Otherwise, the minimum flow -rate shall not exceed 35  % of the maximum flow -rate. 
2.9.2  Variable -speed and multi -speed belt weighers  
Variable and multi -speed belt weighers may have a minimum flow -rate less than 20  % of th e 
maximum flow -rate. The minimum instantaneous net load on the weighing unit shall not be less than 
20 % of the maximum capacity.  
3 Technical requirements  
The technical requirements are based on the requirements of the Government Regulation on 
Measuring In struments, applying the relevant requirements under OIML Recommendation R  50-1 
Continuous totalising automatic weighing instruments (belt weighers) – Part 1: Metrological and 
technical requirements3). 
The verification of measuring instruments type approved  prior to the entry into force of the Metrology 
Act shall be subject to the technical requirements applicable at the time they were put into circulation.  
3.1 Means shall be provided to limit the effects of tilt, loading and rate of operation such that 
maxi mum permissible errors are not exceeded in normal operation.  
3.2 Adequate material handling facilities shall be provided to enable the instrument to respect the 
maximum permissible errors during normal operation.  
3.3 Any operator control interface shall be  clear and effective.  
3.4 The integrity of the display (where present) shall be verifiable by the operator.  
3.5 Adequate zero -setting capability shall be provided to enable the instrument to respect the 
maximum permissible errors during normal operation.  
3.6 Weighing results shall contain the names or symbols of the units of mass in which they are 
expressed. The scale intervals of the indicating and printing devices shall be in the form of 1  × 10k, 
2 × 10k or 5 × 10k of units in which the result is expresse d, where k is a positive or negative whole 
number or zero.  
3.7 The units of measurement shall be:  
a) for mass: gram (g), kilogram (kg) and tonne (t);  
b) for flow -rate: gram per hour (g/h), kilogram per hour (kg/h), tonne per hour (t/h);  
c) for the speed of the belt : metres per second (m/s).  
3.8 If the weighing instrument is switched off or ceases to function, the conveyor belt shall stop, or a 
visible or audible signal shall be given.  
3.9 Weighing instruments shall be proofed against fraudulent use. Components that may not be 
dismantled or adjusted by the user shall be secured against such actions.  
4 Instrument markings  
4.1 Markings on the instrument  
The weighing instruments shall bear the following markings as a minimum:  
– trade mark or name of the manufacturer;  
– the n umber of the type approval certificate, if any;  General Measure No  0111 -OOP -C055-15 
6 – accuracy class  = 0.5, 1 or 2;  
– maximum capacity, in the form Max ... ;  
– totalisation scale interval  d = ...... g, kg or t;  
– nominal speed(s) of the belt  v = ...... m/s; or  
– range of speeds of the belt  v = ...... / ...... m/s;  
– maximum flow -rate  Qmax = ...... g/h, kg/h or t/h;  
– minimum flow -rate  Qmin = ...... g/h, kg/h or t/h;  
– minimum totalised load  Σmin = ...... g, kg or t;  
– temperature range  ...... °C / ...... °C.  
The label bearing the compulsory markings shall be sealed unless it cannot be removed without being 
destroyed.  
4.2 Placement of the official mark  
The official marks shall be placed in such  a manner that after they have been affixed the weighing 
instrument cannot be adjusted or components, for which access is prohibited, accessed. The marks 
shall be of such design that they cannot be dismantled without being damaged or destructed.  
The manner  of placement of the official marks is provided in the type approval certificate or the EC 
type-examination certificate or other document or provisions applied within the context of conformity 
assessment when placing the device on the market and putting it  into use.  
5 Type approval of measuring instruments  
Automatic weighing instruments – continuous totalising weighing instruments shall be placed on the 
market and put into use after conformity assessment in accordance with the Government Regulation 
on Measu ring Instruments and thus are not subject to type approval.  
6 Initial verification  
A procedure identical to that used for follow -up verification referred to in Chapter  7 shall be applied in 
initial verification.  
7 Follow -up verification  
Follow -up verificat ion, i.e. any verification of the measuring instrument conducted after prior 
verification or conformity assessment and, if applicable, examination in accordance with §  11a(1) of 
the Metrology Act shall be carried out in accordance with this measure regardl ess of whether the 
instrument was placed on the market and put into circulation in accordance with the Metrology Act or 
the Government Regulation on Measuring Instruments.  
The verification of weighing instruments shall be subject to the metrological and te chnical 
requirements applicable when they were placed into circulation.  
7.1 Overview of the tests conducted  
Each verification shall consist of the following actions and tests:  
a) visual inspection;  
b) accuracy tests:  
– zero-load test;  
– weighing test;  General Measure No  0111 -OOP -C055 -15 
7 – repeatability test. 
7.2 Visual inspection  
The purpose of the visual inspection shall be to check that:  
– the measuring instrument presented for verification complies with the approved type or design 
of the measuring instrument for which conformity was declared in the cont ext of its placement 
on the market, while attention shall be paid to checking the markings referred to in Chapter  4; 
– the measuring instrument is not mechanically damaged and its metal parts do not have traces 
of corrosion that could have an adverse effect on the function of the instrument.  
If the measuring instrument fails to meet the visual inspection requirements, no further tests are 
performed.  
7.3 Test conditions and equipment  
7.3.1  The weighing instrument shall be fully assembled and fixed in the posit ion in which it is 
intended to be used under typical in -service conditions. The tests shall be carried out using the 
product(s) that are or are intended to be weighed when the instrument is in service.  
7.3.2  The relevant value set out in Article  2.5.2 shal l be used as the minimum test load.  
7.3.3  Test equipment – the control weighing instrument shall make it possible to determine the true 
weight of the test load to an error not greater than 1/3 of the relevant maximum permissible error for 
automatic weighin g referred to in Table  1. 
7.3.4  Where necessary, the control weighing instrument shall be verified immediately after the tests 
to check that its characteristics have not changed. Where the control weighing instrument does not 
have a suitable scale interval , suitable resolution may be obtained by using additional weights to 
determine the changeover point. It must be ensured that the control weighing instrument can be used 
to weigh any test load imposed by the given product.  
7.4 Accuracy tests  
7.4.1  Zero -load test 
The purpose of the zero -load test is to ascertain that the weighing instrument meets the requirements 
for maximum permissible errors for zero indication change and maximum change in the totalising 
indicating device readings recorded during the test. The maximum indication change of the totalising 
indicating device shall be recorded only if the value of the minimum totalised load is equal to or less 
than three belt revolutions at maximum flow -rate Qmax. 
Mark or determine the initial point on the statio nary belt. The instrument must be switched on, warm 
and running. Zero the weighing instrument and disable automatic zero -setting. Record indication I1 
taking account of the point marked on the belt (test start). Let the belt run for a period as close as 
possible to three minutes. The belt revolutions must be complete. Record the indication of total I2 at 
the end of the test and determine whether the error (zero indication change, I2 – I1) does not exceed the 
maximum permissible error referred to in Table  3. 
Where the minimum totalised load is equal to or less than three belt revolutions at maximum flow -rate 
Qmax, record, in addition to indication I1, the maximum and minimum indications Imax and Imin observed 
during the test and determine whether the error (i ndication change of the totalising indicating device I1 
– Imax and I1 – Imin) does not exceed the maximum permissible error referred to in Table  4. 
The measurement errors shall not exceed the relevant maximum permissible errors for the given 
category of we ighing instruments under Table  3 or 4.  General Measure No  0111 -OOP -C055-15 
8 Where the weighing instrument fails to meet the maximum permissible error set out in Article  2.4.1, 
the test may be repeated once.  
7.4.2  Weighing test – material test  
Before the tests, the weighing instrument shall op erate for at least 30 minutes. Before each test, the 
weighing instrument shall be set to zero. On completion of each test, the totalisation of the test load 
shall be recorded. Where the duration of the tests exceeds one day, the zero -load test shall be rep eated 
at the end of each day and at the beginning of the following day.  
7.4.2.1  Single -speed belt weighers  
The tests shall be carried out in pairs at practically identical flow -rates, speeds of the belt and test load 
sizes (to be able to use these results for repeatability evaluations) at the following flow -rates:  
– two pairs (4x) of tests at maximum and minimum flow -rates (as indicated on the instrument’s 
label);  
– one pair (2x) of tests at intermediate flow -rate or 20  % of the interval between maximum and 
minimum flow -rates; where the minimum flow -rate is less than 20  % of the maximum flow -
rate, the tests shall be conducted at maximum and minimum flow -rates only.  
7.4.2.2  Multi -speed belt weighers  
The tests shall be carried out using only one pair of tests at a ll flow -rates for the minimum, 
intermediate and maximum speeds of the belt.  
7.4.2.3  Variable -speed belt weighers  
The tests shall be carried out using only one pair of tests at all flow -rates for the minimum, 
intermediate and maximum speeds of the belt and one separate test shall be conducted at all flow -rates 
while continuously changing the speed within its given range.  
7.4.2.4  Evaluation of the tests  
Record the indications of the totaliser at the beginning ( Ts) and the end ( Tf) of each test and calculate 
and record the mass of the test load weighed by the belt weigher ( A = Tf – Ts). 
Record the mass of the test load obtained using the control weighing instrument ( B). 
Calculate the error in per cent ( A – B)/B × 100 and compare it with the relevant maximum per missible 
errors provided in Article  2.4.1 for verifications or Article  2.4.2 for in -service checks of weighing 
instruments or examination of legal measuring instruments under §  11a(1) of the Metrology Act.  
7.4.3  Repeatability test  
Calculate the difference between the relative errors obtained in each test pair (the smaller error is 
deducted from the greater error). Each result is compared with the relevant maximum permissible 
error referred to in Table  1. 
8 Notified standards  
For the purposes of specifying t he metrological and technical requirements for measuring instruments 
and the verification methods arising from this General Measure, the CMI shall provide notification of 
the Czech technical standards, other technical standards or technical documents of in ternational or 
foreign organisations, or other technical 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 General Measure in a manner accessible to the public (on the 
www.cmi.cz  website).  General Measure No  0111 -OOP -C055 -15 
9 Compliance with notified standards or parts thereof shall be considered, to the extent and under the 
conditions laid down in a General Measure, as compliance with those requirements laid down in this 
measure to which these standards or parts thereof apply.  
 
 
II. 
G R O U N D S  
The CMI has issued this General Measure laying down metrological and technical requirements for 
legal measuring instrume nts and tests for the verification of these legal measuring instruments in 
accordance with §  14(1)(j) of the Metrology Act to implement §  9(1), §  9(9) and  § 11a(3) of the 
Metrology Act.  
Under (d) of Item  2.1.3, Automatic weighing instruments, in the Annex “List of the Types of Legal 
Measuring Instruments” to Decree No  345/2002 specifying the measuring instruments whose 
verification is mandatory and the measuring instruments subject to type approval, as amended, belt 
weighers are classified as measuring inst ruments that are subject to verification.  
As such, the CMI has issued this General Measure to implement §  9(1), §  9(9) and  § 11a(3) of the 
Metrology Act for this specific type of measuring instruments, “automatic weighing instruments – 
continuous totalisin g weighing instruments” laying down the metrological and technical requirements 
for automatic weighing instruments – continuous totalising weighing instruments and the tests for the 
verification of these legal measuring instruments.  
This legislation (Gener al Measure) was notified in accordance with European Parliament and Council 
Directive  98/34/EC of 22  June 1998 on the procedure for the provision of information in the field of 
technical standards and regulations and rules on Information Society services, as amended.  
 
 
III. 
I N S T R U C T I O N S  
In accordance with §  173(2) of the CAP, no appeals may be made regarding general measures.  
In accordance with the provisions of §  172(5) of the CAP, decisions on objections are final and 
appeals may not be made against them.  
Compliance of general measures with legislation may be subject to a review process in accordance 
with §§  94 to 96 of the CAP. A party to the proceedings may initiate review proceedings to be 
conducted by the administrative authority which issued the General Measure. If the administrative 
authority finds no reason to commence the review proceedings, it shall communicate and provide 
grounds for this within 30 days. Pursuant to §  174(2) of the CAP, a ruling on the commencement of 
review proceedings may be iss ued within three years of the entry into force of the General Measure.  
 
 
IV. 
E N T R Y  I N T O  F O R C E  
This General Measure shall enter into force on the fifteenth day as of its date of publication (§  24d of 
the Metrology Act).  General Measure No  0111 -OOP -C055-15 
10 ...…………………………..............  
RNDr. Pav el Klenovský  
Director General