C z e c h  M e t r o l o g y  I n s t i t u t e  
Okružní 31,  638 00  
Brno  
 
1. ------IND- 2014 0030 CZ - EN- ------ 20140129 --- --- PROJET 
Executive summary for EC  (not part of this legal regulation)  
Area measuring instruments for leather in the Czech Republic  are placed on the market and put into 
use in accordance with Directive 2004/22/EC ( Measuring Instruments Directive MID). After being 
put into use, they are subject to national metrological control - verification (within set deadlines). The 
subject of this  notified regulation is only the verification of measuring instruments already in use. The 
regulation does not concern placement on the market or putting into use (except in the cases referred 
to in Article 23 of the MID).  
Area measuring instruments for ma terials other than leather are not subject to metrological control 
after being put into use in the Czech Republic.  
Requirements applicable to these measuring instruments in use are fully compatible with the MID and 
are furthermore based on the Internationa l Organization of Legal Metrology ( OIML ) R 136 -1 
recommendations.  
Some parameters specified here are properties of a measuring instrument  as new  and are only set out 
here because maintaining them in use is subject to a visual or other control within the fr amework of 
verification.  
(End of executive summary).  
 
 
 
The Czech Metrolo gy Institute (hereinafter "CMI" ), as the authority with material and territorial 
jurisdiction in the laying down of metrological and technical requirements for the measuring instrument 
in question and the laying down of test methods for type approval and for verification of the measuring 
instrument in question in accordance with Section 14(1) of Act No 505/1990 on metrology, as amended 
(hereinafter the "Metrology Act" ), and i n accordance with Section  172 et seq. of Act No 500/2004,  the 
Code of Administrative Procedure, as amended (hereinafter the "CAP"), initiated ex officio on 22. 11. 
2013 an administrative procedure pursuant to Section 46 of the CAP, and on the basis of docu mentation 
hereby issues this:  
 
I 
GENERAL MEASURE  
Number: 0111 -OOP -C037 -13 
Ref. No.: 0313/008/13/Pos.,  
 
laying down the metrological and technical requirements for the measuring instruments in 
question, including test methods for verification of the measuri ng instruments in question:  
"Area measuring instruments for leather"  
 
This general measure lays down the metrological and technical requirements for area measuring 
instruments for leather which apply in the course of  their verification following placement on the General measure No 0111 -OOP -C037 -13 
2 market or putting into use . These requirements are in accordance with the requirements of 
Government Regulation No 464/2005 laying down technical requirements for measuring instruments1 
), as amended (hereinafter the "Government Regulation on Measur ing Instruments").  
Metrological requirements which were decisive for their placement into circulation apply to area 
measuring instruments for leather, in the course of  verification, whose type was approved pursuant to 
the Metrology Act, in the version effe ctive up until 30 October 2006, which was before the 
implementation into Czech legislation of Directive 2004/22 /EC of the European  Parliament and of the 
Council, as amended.  
1 Basic concepts  
For the purposes of this general measure, the terms and definitions pursuant to VIM and VIML2 ) 
apply, as well as the following terms and definitions.  
1.1 
area measuring instrument for leather  
an instrument fo r measuring the area of leather  irregular in shape, working on the princi ple of dividing 
a measured area into strips of equal width whose le ngths are measured and from these  the size of the  
area is evaluated   
1.2 
Contact are a measuring instrument  for leather  
an instrument  where the length of individual strips is measured by rolling measuring wheels  
1.3 
Non-contact area measuring instrument  for leather  
an instrument where the length of individual strips is measured using contactless sensors  
1.4 
measuring instrument errors  
the difference between data from a counter (evaluation unit) and the actual size of  a measured area; if 
data from the measuring instrument is greater than the actual size of the area, the error is positive, 
otherwise the error is negative .  
A relative error  Δa is the difference between the mean surface area value of ten measurements ( Ā) and 
the actual area of a measuring sheet ( As). 
 
A relative error of individual measurements  Δi is the difference between the measured values of the i-
th measurement ( Ai) and the mean surface area value of ten measurements ( Ā). 
 
2   Metrological requirements  
Metrological requirements are based on the requirements of the Government Regulation on Mea suring 
Instruments  using the relevant requirements of the OIML R 136 -1 recommendations3).  
                                                   
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 Concep ts and Associated Terms (VIM) and the 
International Vocabulary of Terms in Legal Metrology (VIML) form part of the technical harmonisation volume 
"Terminology in the Field of Metrology "publicly accessible at www.unmz.cz  
3) OIML R 136 -1 "Instruments for me asuring the areas of leathers" - publicly accessible at www.oiml.org  
General measure No 0111 -OOP -C037 -13 
3 Metrological requirements which were decisive for their place ment into circulation apply to measuring 
instruments, in the course of  verification, whose type was approved pursuant to the Metrology Act.  
2.1   Established operating conditions  
Established operating conditions are determined by the manufacturer and indic ated in the measuring 
instrument's descriptive marking . If the manufacturer does not determine these conditions, 
requirements for the maximum permissible error must be met in an ambient temperature range of at 
least –5 C to +40  C. 
Tests must be carried out  at a steady ambient temperature, usually at room temperature. The difference 
between extreme ambient temperature values during a test must not exceed 1/5 of the ambient 
temperature range without being greater than  5 C, and the rate of a temperature change  must not 
exceed 5  C per hour.  
2.2   Maximum permissible error  
The maximum permissible error during subsequent verification is ±1  %, but must not be less than 
±0,01  m2. 
When an additional display unit is used (for example, at the rear of an instrument), th e difference 
between both displays must not be greater than ±0,2  dm2.  
3   Technical requirements  
Technical requirements are based on the requirements of the Government Regu lation on Measuring 
Instruments  using the relevant requirements of the OIML R 136 -13) recommendations.  
Technical requirements which were decisive for their placement into circulation apply to measuring 
instruments, in the course of  verification, whose type was approved pursuant to the Metrology Act.  
3.1 Contact measuring instruments  
A co ntact area measuring instrument for leather is a measuring instrument in which the measured area 
is divided into a specific number of strips equal in width, whose length is measured by rolling 
measuring wheels, automatic ally calculated according to  Simpson 's rule and transmitted to the counter 
dial. The sum of the measured lengths is in linear proportion to the entire surface area and values on 
the dial give the area size directly in dm2. 
The recommended number of feed roller rotations is 60 ± 2 revolutions  per minute.  
Deviation from the zero setting must be no more than 0.4 times the minimum permissible error in 
accordance with Article 2.2.  
3.1   Non -contact measuring instruments   
A non -contact area measuring instrument for leather  is a me asuring instrume nt in which the  area being 
measured is fictively divided into a specific number of strips of equal width given by the number of 
non-contact elements of the sensing sequence . Strips are divided into sections of equal length with 
equipment working in synchro ny with the speed of the measuring instrument's feeding equipment. 
Elementary surfaces  created in this way are electronically calculated and the area being measured is 
evaluated in appropriate units of measurement (dm2) using an evaluation device. Values m ay be 
transferred to a printing device, electronic totalising device, etc.  
The measuring instrument must ensure that the feeding equipment feeds the material being measured 
in places of measurement without slippage at a feed rate of up to 0.5  m/s.  
The printing device must ensure a legible print -out of the size of the measured area.  General measure No 0111 -OOP -C037 -13 
4 The measuring instrument may have an additional display unit. Values on the evaluation and display 
unit must be clearly legible with a minimum digit height of 15 mm. An electric totalising device may 
be attached  to the evaluation unit.  
The measuring instrument may be equipped with a device for connecting to a computer, a measured 
material counter (the counter must be capable of being set to zero), a device for the unifor m guidance 
of the leather by the measuring instrument , an auxiliary device for automatically marking a measured 
area directly on the leather (this must not affect the measuring instrument’ s accuracy) and it must have 
a device for zero -setting all computer circuitry before beginning measurement.  
The measuring instruments may have an auxiliary device for controlling another subsidiary instrument 
or device, such as a stacking device, sorting equipment, packaging equipment, etc.  
3.3   Measuring instrument safe ty and anti -fraud protection.  
The instrument must be secured against fraudulent use. Components that the user may not take apart 
or adjust must be safeguarded against such activities.  
4   Marking measuring instruments  
4.1   Marking s on measuring instrumen ts 
The measuring instrument must have a label with the following information:  
a) the measuring instrument's name,  
b) the name or brand -name of the manufacturer,  
c) the measuring range and unit of measurement,  
d) the serial number and year of manufacture,  
e) the working ambient temperature range,  
f) the maximum and the minimum measurable area,  
g) the type approval mark.  
If the use of an instrument requires a special measure, the necessary instructions must be clearly and 
visibly set out in the close proximity of the indication device.  
A label bearing compulsory marking must be sealed or i t must be impossible to remove  without being 
destroyed .  
4.2    Placement of official mark  
The placement of marks is determined by the certificate of type approval or other document or by the 
configuration applied within the assessment of conformity for placement on the market and putting 
into use.  
The placement of official marks must be such that, after their placement, the measuring instrument 
cannot be adjusted and components cannot be accesse d for which this is forbidden. The marks must be 
configured so that they cannot be removed  without being damage d or destroyed . 
5   Approval of measuring instrument type  
Area measuring instruments for leather are placed on the market and put into use with a  conformity 
assessment in accordance with the Government Regulati on on Measuring Instruments and  are 
therefore not subject to type approval.  General measure No 0111 -OOP -C037 -13 
5 6   Initial verification  
These measuring instruments are placed on the market and put into use with a conformity as sessment 
in accordance with the Government Regulation on Measuring Instruments   
Initial verification applies only to measuring instruments which have a valid certificate on type 
approval at a given time while using a transitional provision in accordance w ith Section 9 of the 
Government Regulation on Measuring Instruments, and to the approval of measuring instruments 
following repair.  
During initial verification, a procedure identical to subsequent verification is applied in accordance 
with Chapter 7.  
7    Subsequent verification  
7.1   General  
7.1.1   Overview of tests performed  
For subsequent verification, i.e. each verification of a measuring instrument carried out after the 
previous verification and during verification in accordance with Section 11(4) of  the Metrology Act, 
the following activities and tests are performed:  
– visual inspection,  
– functional test of measuring instrument,  
– accuracy test.  
7.1.2   Test equipment  
The following equipment is used for testing:  
a) a set  of 10  dm2 to 300  dm2 surface area measuring sheets (flexible or rigid), rectangular or 
circular in shape,   
b) a steel measuring tape at least 5 m long with 1 mm subdivisions along its length,  
c) a stopwatch with 0.6 second measurement uncertainty.  
7.2   Visual inspection  
During a visual inspection of an area measuring instrument for leather the following is assessed:  
– whether the measuring instrument being verified conforms to the approved type or to the 
configuration of the measuring instrument for which conformity has been declare d for being 
placed on the market,  
– whether the measuring instrument displays obvious signs of damage or contamination,  
– whether the completeness and legibility of prescribed signs and markings correspond to the 
requirements of Chapter 4.  
If the measuring in strument does not comply with the requirements of the visual inspection, testing is 
stopped.  
7.3   Testing contact area measuring instruments for leather  
7.3.1  Testing the function of contact instruments  
This test determines whether the actual number of f eed roller revolutions corresponds to Article 3.1.  General measure No 0111 -OOP -C037 -13 
6 The action of the measuring instrument while idle is checked to ensure that  all measuring wheels turn 
smoothly and continuously upon contact with the feed roller and  that the worm wheels are at  a 
standsti ll.   
A check is performed of whether the steel tapes are evenly tensioned and whether they are crossed or 
deformed.  
After inserting a measuring sheet between the feed and measuring roller, an observation is made as to 
whether all measuring units currentl y active rotate relative to the length measured by rolling measuring 
wheels along a measuring sheet. When using a circular measuring sheet, the worm wheel stop pins must 
create a regular arc. When using a rectangular measuring sheet which must be placed  in the measuring 
instrument by one of its sides, worm wheel pins create a straight line. This meth od of inspecting the 
function  of a measuring instrument is performed in the entire range of the working roller (along its entire 
width). If a pin has become pos itioned above or below the coupling rod of the other pins, the measuring 
instrument accuracy test is discontinued until the defect is removed.  
After each control test, the indicator must return to the zero position by turning off (treading down on) 
the me asuring mechanism.  
7.3.2   Testing the accuracy of contact instruments  
When using  rectangular shaped measuring sheets, the sheet must always be placed  in the measuring 
instrument by one of its corners and not by its side, approximately at a 45º angle to the measuring 
instrument conveyer's axis.  
An accuracy  test is performed at the lower and the upper measuring range limit of the surface area and 
at fur ther points (at least at five points) divided across the measuring instrument's measuring range. 
With a measuring instrument range of 30  dm² to 300  dm², the test is performed at 30  dm², 50  dm², 
70 dm², 90  dm², 200  dm² and 300  dm². 
After the measuring instr ument passes through a measuring sheet, the measured value is ascertained. 
After turning off the measuring mechanism, when the scale indicator is at zero (a deviation from the 
zero setting may be no more than 0.4 times the minimum permissible error), the s ame measuring sheet 
is re-installed in the measuring instrument at a different point of the feed roller and the measured value 
of the measuring instrument is re -read. Each tested surface area value is measured ten times.  
The mean  data value (i.e., the arit hmetic average) of a measuring instrument (Ā) recorded by 
measuring the measuring sheet and calculated from ten repeated measurements of the same area, 
performed alternately on the entire working width of the measuring instrument, may differ from the 
corre ct value (As) in a range of 1/20 of the upper limit to the upper limit of the surface area by no more 
than the maximum permissible error according to Article 2.2, i.e., by ±1  %. The values of individual 
measurements (Ai) may differ from the mean value ( Ā) by no more than ±2  % of a measured area.  
If measuring sheets for given values are not available, a set of measuring sheets is used for measuring 
larger areas (for example, 2 sheets), whose total area corresponds approximately to the value of th e 
scale whi ch is to be tested. Zero-setting counters is only performed after both measuring sheets have 
passed through the measuring instrument. It is also possible to insert a measuring sheet gradually, as 
many times in a row, without releasing the measuring mechani sm, until the multiple of the area of the 
measuring sheet corresponds to the controlled area's value.  
7.4   Testing non -contact area measuring instruments for leather  
7.4.1   Testing the function of non -contact instruments  
When testing function, the measu ring instrument is left to run idle for around 20 minutes in order to 
put the electronics through  working conditions.  
A check is performed of the accuracy of the function of sensors by the gradual shading of the contact -
less elements with opaque material and by observing the data on the evaluation unit, as well as the 
activity of the feeding device while checking its speed, which is ascertained according to the ratio:  General measure No 0111 -OOP -C037 -13 
7 v = l/t     (m/s)  
where  
l     is the length of the feed roller section, measured with mea suring tape,  
t     is time  measured by a stopwatch during which the section length  l passes, for example, a mark on 
the wire of the feeding device.  
Printing and stamping equipment is discarded in a suitable manner and, with a measuring sheet of a 
nominal value, equal to the lower limit of the measuring range of the surface area, 10 measurements 
are performed by gradually placing measuring sheets along  the entire width of the conveyer.  
The measurement results must comply with Article 2.2. At the same time, a function check of the 
printing device is performed by comparing the printed data (from the printer, number of leather pieces, 
totalising device) w ith the evaluating unit, which must be identical.  
The accuracy of zero -setting the data of a previous measurement is checked before starting the next 
measurement, when the evaluating unit must be automatically reset to zero, or re -setting may occur 
after the end of the next measurement (in accordance with the measuring instrument's construction). 
The test is performed with two measuring sheets with different surface areas which are measured after 
each other in the necessary chronological sequence. If the m easuring instrument is equipped with a 
zero-setting button, its function is checked.  
7.4.2   Testing the accuracy of non -contact instruments  
When using  rectangular shaped measuring sheets, the sheet must always be placed  in the measuring 
instrument by one of its corners and not by its side, approximately at a 45º angle to the measuring 
instrument conveyer's axis.  
The accuracy of a measuring instrument is ascertained at the lower limit of the measuring range of a 
surface area, with a surface area size of 30  dm2, 50 dm2, 100  dm2, 150  dm2, 200  dm2, 300  dm2 and at 
the upper limit of the measuring range (no more than 500  dm2).  
Rectangular shaped measuring sheets must always be placed sideways on the conveyer so that they 
enter the sensor by one of its corners, w ith a minimum distance of 5 cm from the edge of the feeding 
device. When using more than one measuring sheet (to create the necessary surface area), there must 
be no gap in the direction of movement of the feeding device and it must be made level with the 
feeding device. Each prescribed surface area size is measured ten times and the measuring sheets are 
placed on the same area of the feeding device after each measurement.  
The mean  data value (i.e., the arithmetic average) of a measuring instrument (Ā) recorded by 
measuring the measuring sheet and calculated from ten repeated measurements of the same area, 
performed alternately on the entire working width of the measuring instrument, may differ from the 
correct value (As) in a range of 1/20 of the upper limi t to the upper limit of the surface area by no more 
than the maximum permissible error according to Article 2.2, i.e., by ±1  %. The values of individual 
measurements (Ai) may differ from the mean value ( Ā) by no more than ±2  % of a measured area.  
8    Notified standards  
For the purposes of specifying the metrological and technical requirements for measuring instruments 
and for the purposes of specifying the test methods during approval of their type and verification, 
resulting from this general measure,  the CMI will notify Czech technical standards, further technical 
standards or technical documents of international or foreign organisations, or other technical 
documents containing more detailed technical requirements (hereinafter "notified standards"). A  list of 
these notified standards corresponding to the appropriate measure shall be notified by CMI together 
with the general measure in a publicly accessible manner (on the website  www.cmi.cz ). 
Compliance with the not ified standards or compliance with parts thereof, in the scope and under the 
conditions laid down by this general measure, is considered compliance with the requirements laid 
down by this measure, to which th ose standards or parts th ereof relate . General measure No 0111 -OOP -C037 -13 
8  
 
II 
JUST IFICATION  
For the implementation of Section 24c of the Metrology Act, the CMI hereby issues this general 
measure laying down metrological and technical requirements for the measuring instruments in 
question and test methods for the verification of th ese measuring instruments.  
Decre e No 345/2002 laying down  measuring instruments for compulsory verification and measuring 
instruments subject to type approval, as amended, ranks area measuring instruments for leather as 
measuring instruments subject to verifica tion in the annex List of Measuring Instruments under 1.2.1.  
Therefore, the CMI, for the implementation of Section 24c of the Metrology Act, for this particular 
type of measuring instrument "area measuring instruments for leather", issues this general meas ure 
laying down metrological and technical requirements for area measuring instruments for leather and 
test methods for the verification of these measuring instruments.  
This regulation (General Measure) was notified in accordance with Directive 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 and of rules on Information Society 
services, as amended.  
 
 
III 
INSTRUCTIONS  
A legal remedy u nder Section 173(2) of the CAP may not be lodged against a general measure.  
In accordance with Section 172(5) of the CAP, neither an appeal nor a complaint  may be lodged 
against a decision on objections.  
Accordance of the general measure with legislation may be subject to a review process in accordance 
with Sections  94 to 96 of the CAP . A party may submit a motion to initiate a review process to the 
administrative authority which has issued this general me asure.  If the administrative authority does not 
find reasons to initiate a review process, it shall communicate this fact together with its reasons to the 
applicant within thirty days. In accordance with Section 174(2)  of the CAP , a resolution on the init iation 
of a review process may be issued within three years of the effective date of a general measure.  
 
 
IV 
EFFECTIVENESS  
This general measure shall enter into effect  on the fifteenth day following  the date of its publication 
(Section 24d of the Metrology  Act).  
 
 
 
 
...…………………………..............  General measure No 0111 -OOP -C037 -13 
9 RNDr. Paul Klenovský  
Director General