Czech Metrology Institute  
Okružní 31, 638 00 Brno  
 
1. ------IND- 2018 0299 CZ - EN- ------ 20180711 --- --- PROJET 
Executive summary for the European Commission (not part of this legislation)  
instruments and systems measuring the flow volume of liquids other than water or liquefied gases - 
dispensers of the  aqueous urea solution AdBlue, are placed on the market and put into use in the 
Czech Republic in accordance with Directive 2014/32/EU (the Measuring Instruments Directive – 
MID). 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.  
The requirem ents imposed on these measuring instruments when in use are fully compatible with the 
MID and are also based on OIML Recommendation  117.  
Some parameters listed in this document are properties of the measuring instruments when they are 
new; they are listed herein only because the preservation of these properties when the instruments are 
in use is subject to visual or other checks during verification.  
(End of executive summary.)  
 
Contact person: Tomáš Hendrych  
Tel.: +420 545 555 414  
 
 
P U B L I C  N O T I C E  
 
As the a uthority 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 contr olled 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 (here inafter referred to as the ‘APC ’), the Czech Metrology Institute (hereinafter 
referred to as the ‘CMI ’) commenced ex officio proceedings on 2 February 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 -C082 -17 General Measure No 0111 -OOP-C082 -17 
2 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 instrumen ts: 
 
instruments and systems measuring the flow volume of liquids other than water or liquefied 
gases - dispensers of the aqueous urea solution AdBlue  
 
This general measure stipulates the metrological and technical requirements for instruments and 
systems for measuring the flow volume of liquids other than water or liquefied gases, specifically 
AdBlue dispensers, that are applied after they are placed on the market or put into use during their 
verification. These requirements are in accordance with the requ irements of Government Regulation 
No 120/2016 on the conformity assessment of measuring instruments when being placed on the 
market, as amended (hereinafter referred to as the ‘Government Regulation on measuring 
instruments ’)1. 
For AdBlue dispensers with t ype approval under the Metrology Act, as amended effective up to 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, verification is subject to the metrological  requirements 
that were applicable when they were placed into circulation.  
This general measure does not apply to instruments for measuring the flow of fuel, cryogenic liquids, 
compressed natural gas (CNG), liquefied mixtures of hydrocarbon gases (LPG) and  windscreen 
washer fluid.  
1 Basic definitions  
For the purposes of this general measure, terms and definitions pursuant to VIM and VIML2 as well as 
the terms and definitions stated below shall apply.  
1.1 instruments and systems for measuring the flow volume  of liquids other than water 
or liquefied gases  
instruments for measuring the flow volume or weight of various liquids other than water and liquefied 
gases  
1.2 dispenser of the aqueous urea solution AdBlue (hereinafter referred to as an ‘AdBlue 
dispenser ’) 
a measuring system for refilling AdBlue in vehicles with internal combustion engines using this 
technology  
1.3 dispensing nozzle  
a manually operated component of the dispenser that regulates the flow of liquid while it is being 
dispensed; it includes a nozzle and an automatic shut -off mechanism  
                                                      
1  This government reg ulation implements Directive 2014/32/EU of the European Parliament and of the 
Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making 
available on the market of measuring instruments.  
2  TNI 01 0115 Internat ional Vocabulary of Metrology – Basic and General Concepts and Associated Terms 
(VIM) and International Vocabulary of Legal Metrology (VIML) are part of the technical harmonisation 
compendium ‘Terminology in the field of metrology ’, which is publicly avail able at www.unmz.cz.  General Measure No 0111 -OOP-C082 -17 
3 1.4 interruptible measuring system  
a measuring system can be considered interruptible if the flow of liquid can be easily and quickly 
stopped  
1.5 commercial transaction  
a contractual relationship where the result  of measurement serves as a basis for the price to be paid and 
where one of the parties involved in the transaction related to the measurement is the customer and all 
parties accept the result of the measurement obtained at the given time and place  
2 Metro logical requirements  
Metrological requirements are based on requirements of the Government Regulation on measuring 
instruments and on requirements of OIML  R 117-13. 
During verification, measuring instruments are subject to the metrological requirements tha t were 
applicable when they were placed into circulation.  
2.1 Rated operating conditions  
2.1.1 Ambient temperature range  
AdBlue dispensers must work properly over a range of ambient temperatures specified by the 
manufacturer as the operating temperature ra nge, which must be at least -10 °C to +55 °C.  
2.1.2 Flow range  
The flow range of a measuring system specified by the manufacturer must be within the limits of the 
flow range of each of its components, especially the flow meter.  
|The minimum required flow ratio Qmax:Qmin of an AdBlue dispenser is 4:1.  
2.1.3 Measured liquid  
The measured liquid must be specified by a name or type whose physical properties are specified and 
generally known, or must be specified directly by stating the range of relevant physica l properties with 
which manufacturers supply these liquids, e.g. example density or viscosity range, temperature range, 
or pressure range.  
2.2 Measuring range  
2.2.1  Flow measurement range  
AdBlue dispensers must meet requirements for the maximum permissibl e error over the entire flow 
measurement range specified by the manufacturer.  
2.2.2 Minimum measured quantity ( mmq )  
The minimum measured quantity of liquid, which the measuring system is intended to measure, is 
expressed in the form 1 ×  10n, 2× 10n or 5×  10n units of volume or weight, where n is a positive or 
negative whole number, or zero.  
An AdBlue dispenser ’s minimum measured quantity must not be smaller than the largest of the 
minimum measured quantities of any of its components.  
                                                      
3  OIML R 117 -1 ‘Dynamic measuring systems for liquids other than water. Part 1: Metrological and technical 
requirements ’ – publicly accessible at www.oiml.org  General Measure No 0111 -OOP-C082 -17 
4 2.3 AdBlue dispenser accuracy classification  
2.3.1  AdBlue dispenser accuracy class  
For dispensing AdBlue, dispensers of accuracy class 0.5 are used, given by the maximum permissible 
error of the measurement system.  
2.3.2 Maximum permissible errors  
Table 1 states the maximum permissible errors for volumes of two litres or more.  
Table  1 – Maximum permissible errors for V ≥ 2 litres  
--- Maximum permissible error  
Measuring systems (A)  
(AdBlue dispensers)  0.5 % 
Measuring instruments (B)  
(independent measuring instruments as 
components to be used in an AdBlue 
dispenser)  0.3 % 
 
Table 2 states the maximum permissible errors  for volumes less than two litres.  
Table  2 – Maximum permissible errors for V < 2 litres  
Measured volume  V Maximum permissible error  
V < 0.1 L 4 × the value in Table 1 used for 0.1  L 
0.1 L ≤ V < 0.2 L 4 × the value in Table 1  
0.2 L ≤ V < 0.4 L 2 × the v alue in Table 1 used for 0.4  L 
0.4 L ≤ V < 1 L 2 × the value in Table 1  
1 L ≤ V < 2 L the value in Table 1 used for 2  L 
 
Regardless of the measured amount, the size of the maximum permissible error is the larger of the 
following two values:  
a) the absolute  value of the maximum permissible error listed in Table 1 or Table 2,  
b) the absolute value of the maximum permissible error for the smallest measured quantity Emin. 
For the smallest measurements equal to two litres or more, the following conditions shall app ly: 
Condition  1: Emin must meet the following condition: Emin ≥ 2R, where  R is the smallest increment 
value on the indicator.  
Condition  2: Emin is given by the  following  formula: Emin = (2·mmq )  (A/100), where mmq  is the 
smallest dispensed amount, and A is the numerical value for measuring systems (A) in 
Table  1. 
For the smallest dispensed amounts, less than two litres, condition 1 above applies, and  Emin equals 
double the value given in Table 2 for measuring systems (A) from Table  1. General Measure No 0111 -OOP-C082 -17 
5 For a measuring system and individual measuring instruments, the maximum permissibl e error must 
not be misused, nor may one of the parties be given a systematic advantage.  
3 Technical requirements  
Technical requirements are based on the requirements of the Government Regulation on measuring 
instruments and on the requirements of OIML R 117-13. 
During verification, measuring instruments are subject to the technical requirements that were 
applicable when they were placed into circulation.  
3.1 AdBlue dispenser design  
A measuring system that comprises an AdBlue dispenser shall consist of the  following main 
components as a minimum:  
 a flow meter;  
 a counter;  
 an indicator;  
 a point of separation, usually the dispensing nozzle;  
 a hydraulic circuit.  
 
For proper operation, the following may need to be connected to the measuring system:  
 a filter;  
 a pump;  
 a gas separator.  
The measuring system may be equipped with other auxiliary and additional devices required for 
proper AdBlue dispenser operation.  
3.2 AdBlue dispenser design requirements  
Other auxiliary devices may be part of the dispenser or measurin g instrument counter or they may be 
connected to the counter via an interface.  
The dispenser may have its own supply of the measured liquid or it may be intended for installation 
into a central supply system. If the AdBlue dispenser has its own supply, a g as separator must be 
installed immediately in front of the measuring instrument inlet.  
AdBlue dispensers must be equipped with a volume counter zeroing device.  
If they also contain price counters, it must be possible to zero them.  
Price and volume counter zeroing devices must be arranged so that the zeroing of one counter 
automatically leads to the zeroing of the other.  
It must be impossible to zero the volume and price counter during the dispensing process.  
It shall not be possible to start a new measurem ent until the counters have been reset to zero.  
If the AdBlue dispenser has its own supply of the measured liquid powered by an electrical motor, it 
must be equipped with a device that, after the electrical motor stops, prevents any more AdBlue from 
being dispensed until the volume counter has been zeroed.  
If only one nozzle can be used during the dispensing process and in order to finish said process, it 
must then be put back in the dispenser; subsequent dispensing must be suspended until the indicator 
has been zeroed.  General Measure No 0111 -OOP-C082 -17 
6 If two or more nozzles can be used simultaneously or alternately, and then the nozzles must be 
replaced, subsequent dispensing must be suspended until the indicator has been zeroed.  
The above requirements do not apply if an auxiliary hand pu mp is used.  
If the measuring system is equipped with a printer, it must be connected to the volume counter zeroing 
device. This arrangement shall make it possible to check the printed delivery sheet by comparing it 
with the information on the counter. The amount displayed on the indicator must not change during 
printing.  
AdBlue dispensers must be designed to allow interruptible activity.  
In the event of a power cut, the electronic display shall continue running:  
 continuously and automatically for at least 1 5 minutes after the main power supply fails, or  
 for a total of at least 5 minutes in one or several phases controlled manually for one hour after 
the failure.  
The AdBlue dispenser must be designed so that after a power cut of more than 15 seconds, interrup ted 
dispensing cannot resume.  
3.3 Self-service arrangement with AdBlue dispensers  
Information provided by the dispenser must remain available to the parties involved in the sales 
transaction until it has been settled.  
If a self -service arrangement is for two or more AdBlue dispensers, each one must have an 
identification number that is part of each piece of information provided by the self -service dispenser. 
In a self -service arrangement, the data on the indicator of the dispenser, the printer and the memo ry 
device display must be the same.  
If data transmission between the dispenser and the self -service facility is in the form of impulses, all 
data provided by the self -service facility must not display any mutual differences for any measured 
value related t o the same measurement. Data provided by the self -service facility must not differ from 
any of the pieces of information from the dispenser by more than one increment or by the greater of 
two increments, if different.  
The printer in the self -service arrang ement shall not reproduce information from the dispenser as the 
difference between two printed values.  
The payment method and/or operating mode must not change prior to the end of the current 
measurement. The self -service arrangement, including conditions clearly specifying operating 
methods, must be designed so that the customer has access to at least one primary piece of information 
from the dispenser for the customer, at least until the end of the transaction, so that the customer can 
check the dispensed  amount and price. If the self -service arrangement summarises dispensed volumes 
of liquid on an ongoing basis for various registered customers, the value of the increment used for 
these sums must not have an effect on the smallest measured quantity.  
3.4 At tended service mode  
If the measured information is displayed only on the dispenser indicator, this indicator must be 
labelled with information clearly visible to the customer to the effect that this dispenser may be made 
available only by the operator afte r the current sales transaction has been completed, and that in the 
case of a dispute, the information on the indicator is considered to be correct.  
In attended service mode, the transaction shall be settled prior to the customer leaving the site of 
delive ry. The measurement operation ends when the transaction has been settled.  
3.5 Protection against unauthorised tampering  
The AdBlue dispenser has the required number of places for official marks.  General Measure No 0111 -OOP-C082 -17 
7 The dispenser is designed so that the measuring instrument or  indicator cannot be tampered with in a 
way that could affect the accuracy of measurement without visible damage to an official mark.  
4 Markings  
4.1 Marking of the AdBlue dispenser  
Each dispenser must have a special identification plate stating at least t he following information:  
a) the manufacturer's name or trade mark;  
b) identification of the dispenser type;  
c) the serial number and year of production;  
d) the minimum flow Qmin and maximum flow Qmax; 
e) the minimum (if needed) and maximum operating pressure;  
f) the smalle st measured volume ( Vmin); 
g) the name or type of measured liquid, or the range of relevant characteristics;  
h) the minimum and maximum temperature of the measured liquid;  
i) the minimum and maximum ambient temperature;  
j) the mechanical and electromagnetic class of t he ambient environment;  
k) the nominal AC and the limit DC voltage;  
l) the accuracy class;  
m) the number of the type approval certificate, if available, or indication of conformity;  
n) identification of the positions of individual dispensing locations.  
This identifica tion plate must be firmly affixed to the chassis of the AdBlue dispenser in a visible 
location and sealed.  
All data on the AdBlue dispenser ’s identification plate must be legible.  
4.2 Marking of AdBlue dispenser components  
Each separate metrologically rele vant component of a dispenser, such as the flow sensor, measurement 
converter, counter or gas separator must state at least (e.g. on another label) the following information:  
 the serial number;  
 the manufacturer's name or trade mark;  
 the number of the type approval certificate, if available;  
 other relevant characteristics for the specific device type.  
All information on the label affixed to the component must be indelible, irremovable and legible.  
4.3 Marking of the indicator  
The indicator must contain the following information:  
 ‘litre(s) ’ or ‘L’, ‘l’ or ‘dm3’ after the indicated amount;  
 the national currency unit (CZK) near the indication of the price to be paid;  
 ‘CZK/l ’, ‘CZK/litre ’, or ‘CZK/dm3’ near the indication of the unit price;  
 information regarding  the minimum measured quantity.  General Measure No 0111 -OOP-C082 -17 
8 5 Type approval of the measuring instrument  
AdBlue dispensers are placed on the market and into use with a conformity assessment pursuant to the 
Government Regulation on measuring instruments1, and are thus not subject to ty pe approval.  
6 Initial verification  
AdBlue dispensers are placed on the market and into use with a conformity assessment pursuant to the 
Government Regulation on measuring instruments,1 and are thus not subject to initial verification.  
7 Subsequent verif ication  
7.1 General  
Subsequent verification shall consist of the following actions and tests:  
a) a visual inspection;  
b) an accuracy test;  
c) tests of auxiliary and additional devices.  
For dispensers with several independent dispensing locations, all dispensing lo cations are tested 
separately, and these tests are evaluated individually. AdBlue dispensers with two ranges are first 
verified for the lower range and then the test is extended by a test of the highest achievable flow rate.  
In the case of two flow sensors  being installed in parallel, both flow sensors are first tested separately, 
and then a test of the entire system is conducted (parallel connection) at all three stipulated flow rates.  
Dispensers with one hydraulic measuring part and several dispensing (s atellite) locations will be tested 
according to a regular testing programme. Finally, a test at the maximum achievable flow rate will be 
performed from each other dispensing location (from each satellite dispensing nozzle).  
AdBlue dispensers are tested wit h the liquid they are intended to measure.  
7.2 Test equipment  
Test equipment used to perform accuracy tests must have an extended uncertainty of measurement of 
less than 1/5 of the maximum permissible error pursuant to Article 2.3.2, Table 1.  
7.3 Visual i nspection  
The following are assessed during the visual inspection of an AdBlue dispenser:  
 whether the measuring instrument submitted for verification and its components conform to the 
approved type or with the design of a measuring instrument for which con formity has been 
declared as part of its placement on the market; attention must be paid when  checking markings 
pursuant to Chapter 4;  
 whether the measuring instrument and its components, including rubber hoses, are physically 
damaged or whether metal part s show signs of corrosion.  
If the measuring instrument fails to meet visual inspection requirements, no further tests are 
performed.  
7.4 AdBlue dispenser accuracy test  
An accuracy test of a dispenser and its measuring instruments is performed using the vol ume method, 
by dispensing a specified amount of liquid into a standard graduated container at a specified flow rate.  
Test flow rates are specified according to the following formulae:  General Measure No 0111 -OOP-C082 -17 
9 Q1 = (1 to 1.1) × Qmin, 
Q2 = (0.22 to 0.28) × Qmax, 
Q3 = (0.6 to 1) × Qmax. 
At each of the three test flow rates, measurement errors for the tested AdBlue dispenser are calculated.  
The expanded volume determination uncertainty during measurement may not exceed 1/3 of the 
maximum permissible error specified in Article 2.3.2.  
The amount of liquid used during the accuracy test must be at least 1  000 times the increment on the 
counter.  
The dispenser has passed the accuracy test if none of the relative deviations of the indicated volume 
exceed the maximum permissible error listed  in Article 2.3.2.  
If all true measurement errors have the same sign, in order to meet the requirements of Article 2.3.2, at 
least one of the measurement errors at a typical flow rate between 0.25 Qmax and Qmax must be less 
than half the maximum permissibl e error.  
7.5 Tests of auxiliary and additional devices  
The correct functioning of auxiliary and additional devices is checked, if the dispenser is equipped 
with them. The relevant test is to be conducted only once. Tests of auxiliary and additional device s 
may be combined with the accuracy test. The following tests are performed if relevant to the dispenser 
and the device is used to fulfil contractual obligations.  
7.5.1  Zeroing test  
The volume counter values and, if applicable, the price values are read a fter the dispenser has been 
zeroed.  
The residual indication after zeroing shall not be greater than half the minimum specified volume 
deviation Emin for counters with continuous display.  
Counters with discontinuous display shall indicate zero after having been zeroed, without any 
ambiguity.  
7.5.2  Aggregate counter test  
The difference between the figure on the aggregate counter and the figure on the indicator that applies 
to the same measurement is specified. The indication of the aggregate counter is determ ined as the 
difference between the initial and final values.  
The difference between these figures must not be more than one increment of the aggregate counter.  
7.5.3 Price counter test  
For dispensers with a mechanical counter, the test must be performed f or at least two unit prices at 
maximum and minimum counter rotation rates.  
For dispensers with an electronic counter, the test is performed for a maximum unit price. The price 
indicated is compared to the price calculated as the product of the indicated v olume and the unit price.  
During dispenser verification, the test is performed only for the unit price currently in use.  
The difference between the price displayed and the price calculated from the unit price and the 
indicated amount must not be greater t han the price corresponding to Emin. 
7.5.4  Additional volume counter test  
Figures indicated by additional volume counters are compared with figures on the indicator that apply 
to the same measurement.  
The figures must not differ from each other by more tha n one increment of the scale that is the largest 
of the increments of scales of devices being compared.  General Measure No 0111 -OOP-C082 -17 
10 7.5.5  Pre-set test  
A measurement is made using a pre -set volume or price and the difference between the pre -set 
quantity and the quantity indicated by t he volume or price indicator at the end of the measurement is 
determined.  
For measuring instruments in pre -pay or pre -order mode, this difference must not exceed the smallest 
specified volume deviation Emin or price corresponding to this deviation.  
7.5.6 S elf-service facility test  
A measurement is made using the self -service facility and the difference between the pre -set quantity 
and the quantity indicated by the volume or price counter at the end of the measurement is determined.  
The results must not diff er from each other. For measuring instruments in prepaid or pre -ordered 
mode, pre -set requirements also apply to the self -service facility.  
7.5.7  Printer test  
Figures from the printer are compared with figures on the indicator that apply to the same 
measu rement.  
These figures must not differ from each other by more than one increment of the indicator.  
8 Examination of the measuring instrument  
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 last sentence of Article 7.3 shall not apply. Two times the maximum permissible errors 
pursuant to Chapter 7 shall be applied as the maximum permissible error.  
9 Notified standards  
For the purposes of specifying the metrological and technical requirements for measuring instruments 
and specifying the testing methods for their type approval and verification stemming from this general 
measure, the CMI shall notify Czech t echnical 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 pu blish 
a list of these notified standards attached to the relevant measures, together with the general measure, 
in a manner accessible to the public (on www.cmi.cz ). 
Compliance with notified standards or parts thereof is co nsidered, 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 demonstrat ing compliance with the requirements. 
These requirements may also be met by using another technical solution guaranteeing an equivalent or 
higher level of protection of legitimate interests.  
II. 
G R O U N D S  
The CMI issues, pursuant to §  14(1)(j) of the Metrolo gy Act, for the implementation §§ 6(2), 9(1) and 
(9) as well as  11a(3) of the Metrology Act, this general measure laying down the metrological and 
technical requirements for legally controlled and testing methods for verification of the following 
legally c ontrolled measuring instruments: instruments and systems for measuring the flow volume of 
liquids other than water or liquefied gases – dispensers of the aqueous urea solution AdBlue.  General Measure No 0111 -OOP-C082 -17 
11 Implementing Decree No 345/2002 specifying measuring instruments for ma ndatory verification and 
measuring instruments subject to type approval, as amended, classifies the measuring instruments 
under item 1.3.12 in the annex entitled ‘List of legally controlled measuring instruments ’ as measuring 
instruments subject to type ap proval 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 i n 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 shall be submitted in wr iting 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 exte nt the comments 
challenge the measure; how the general measure runs contrary to legislation or how the general 
measure or the procedure that preceded it is inaccurate; which matters the comments concern and what 
is being proposed. Said comments must also i dentify 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 Department, Okružní 31, 638 00 Brno, after making arrangements by 
telephone.  
This general measure shall be posted for 15  days.  
 
 
 
 
 
 
 ...………………………… ..............  
Pavel Klenovský  
Director -General  
 
 
Person responsible for accuracy: Tomáš Hendrych  
 
Posted on:  12 April 2 018 
Signature of the authorised person confirming posting:  ....................................................  
 General Measure No 0111 -OOP-C082 -17 
12 Removed on:  
Signature of the authorised person confirming removal:  ....................................................