Czech Metrology Institute  
Okružní 31, 638 00 Brno  
 
1. ------IND- 2018 0337 CZ - EN- ------ 20180803 --- --- PROJET 
Executive summary for the EC (not part of this legislation)  
'Measuring instruments used to monitor activity and concentration of effluents from nuclear facilities, 
from nuclear raw material min ing or processing facilities, from the processing or application of 
radioactive materials, and from radioactive waste processing plants, and to determine environmental 
radiation exposure due to effluents' —modules for discontinuous measurement of activity o r 
concentration by sampling that require specific test procedures are placed on the market and put into 
use in the Czech Republic pursuant to Act  No 505/1990 on metrology, as amended.  
The subject of this notified regulation is to lay down metrological and technical requirements for this 
measuring instruments. This regulation  also stipulates tests for type approval and verification.  
(End of executive summary.)  
 
Contact person:  Mgr.  Tomáš 
Hendrych  
Phone:545  555 414 
 
 
P U B L I C  D E C R E E  
 
As the authority with subs tantive 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 controlled measuring in struments pursuant to 
§ 14(1) of Act  No 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 ’) commence d 
ex officio proceedings on 26  February  2016 pursuant to §  46 of the CAP, and, based on 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 -C072 -16 
laying down the metrol ogical and technical requirements for legally controlled measuring 
instruments, including testing methods for type approval and verification of the following legally 
controlled measuring instruments:  
 
'Measuring instruments used to monitor activity and con centration of effluents from nuclear 
facilities, from nuclear raw material mining or processing facilities, from the processing or 
application of radioactive materials, and from radioactive waste processing plants, and to Measure of a General Nature No  0111 -OOP -C072 -16 
2 determine environmental radiation exposure due to effluents' —modules for discontinuous 
measurement of activity or concentration by sampling that require specific test procedures  
 
1 Basic definitions  
For the purposes of this general measure, the terms and definitions according to VIM and VI ML1) and 
the following definitions apply:  
1.1 
sample  
for the purposes of this document, what is being addressed is the material part of the measured 
medium, a part that typically has a particular property required for measurement.  A sample is either 
part o f a liquid (typically liquid samples) or a suitable carrier with part of the medium bound to it 
(particulate or aerosol samples from air attached to a mechanical filter, or specific materials absorbed 
into suitable absorbers, typically mostly gaseous forms  containing iodine, hydrogen  or carbon).  
Measurement of the sample leads to this property of the medium being determined with sufficient 
accuracy (taking into account the ratio of the amount of the medium that passed through the sampling 
apparatus to the t otal amount of the medium).  For the purposes of this document, property is defined 
as the activity or specific (volume, mass) activity of the medium.  Here, the medium is air or water.  In 
order to determine the properties of the medium, the sample can be me asured in its entirety, or in 
parts, or can be subjected to further (chemical) analysis.  
1.2 
sampling apparatus  
a measuring system module.  It must be precisely identifiable and a separate evaluation pursuant to 
prescribed requirements is required to confir m its functionality.  It is intended for sampling liquids in 
order to determine activities in facility effluents or in the environment where a specific sampling 
procedure is prescribed.  The sampled part of the medium may have a variety of chemical forms, an d 
this form may need to be changed in the sampling apparatus for sampling purposes.  
NOTE Sampling may be continuous or discrete.  The sampling apparatus must contain a flow meter with the 
meter's indications accessible on a remote indication device.  
1.3 
indication device  
the part of the meter that displays results of measurement of flow rate or flow volume (or the mass of 
the medium that has flowed through), either continuously or upon request.  
1.4 
built -in sampling apparatus  
a sampling apparatus installed i n the circuit of the measured medium.  If the sample is taken from a 
location other than where the meter is installed, the properties of this circuit (supply line) must be 
taken into account during testing.  
1.5 
controlled sampling  
the flow rate of the mediu m is controlled according to specific sampling requirements  
                                                      
1) TNI 01 0115 International 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 available at www.unmz.cz.  Measure of a General Nature No  0111 -OOP -C072 -16 
3 1.6 
proportional sampling  
sampling is controlled so that flow rate is proportional to some variable (e.g. the flow through the 
sampling apparatus is proportional to airflow in a ventilation chimne y). The proportionality factor 
remains constant during the measurement cycle.  
1.7 
constant sampling  
sampling is controlled so that the flow is time -independent  
1.8 
capture efficiency  
the likelihood that a defined entity in a medium passing through a sampli ng apparatus will become 
part of the sample  
1.9 
capture medium  
a mechanical filter, or cartridge containing an absorbent material, or a cuvette with an absorbent 
liquid.If the sample is a proportionally captured part of the tested medium (usually a liquid) , it is 
placed directly into a suitable container.  
1.10 
aerosols  
a suspension of solid or liquid particles in air or gas  
1.11 
aerodynamic equivalent diameter  
the diameter of a sphere with unit density that has the same gravitational settling velocity as th e given 
particle  
1.12 
activity median aerodynamic diameter (AMAD)  
the aerodynamic diameter of particles for which 50  % of particle activity is related to dimensions 
smaller (or greater) than this diameter  
2 Metrological requirements  
2.1 Medium flow control  
A sampling apparatus with controlled sampling must permit flow of the measured medium, monitor  
and if needed control the sampling rate over the entire measurement range.  The properties of the 
medium, method and range of flow control or sampling, the prope rties of the surrounding 
environment, and other requirements for reliable operation must be stipulated by the manufacturer.  
Given the wide range of possible influencing conditions, these conditions and permitted tolerances 
depend on agreement between the m anufacturer and the user.  
2.2 Rated operating conditions  
The manufacturer must stipulate the type of measured media, its operating conditions, especially its 
temperature, pressure, and permitted content of inhomogeneities (solid particles, aerosols, bubble s, 
chemical composition).  The manufacturer must also specify the sampling method and required 
physical and chemical properties of the medium and the sampled part of the medium.  Measure of a General Nature No  0111 -OOP -C072 -16 
4 2.3 Measurement range  
The manufacturer must stipulate the range of flow of the medium within which the sampling apparatus 
is functional, and any error responses if the flow is outside this range.  The manufacturer must stipulate 
how the amount of medium that has flowed through is indicated (volume, in the case of gases, 
including the values of stipulated quantities, or its mass).  
2.4 Maximum permissible error  
The maximum permissible error in indicated volume flow depends on the sampling purpose and 
method.  The manufacturer must stipulate the maximum permissible error for each assumed p urpose.  
Special attention must be paid to the possible effect on measurement of clogging of sampling routes 
(installed meters), filters, and valves  and to eliminate such additional errors.  
3 Technical requirements  
3.1 Mechanical properties  
Mechanical prope rties must enable the sampling apparatus to function reliably for the entire duration 
of its expected operation.  They must permit convenient replacement of the capture medium without 
adulterating samples.  During replacement of the capture medium, measureme nt of volume flow must 
not be affected.  
3.2 Pump  
The pump is an important element for controlling flow through the sampling apparatus.  Its design 
must permit permanent and reliable operation when used as intended.  If flow is controlled by 
manipulating the pump motor, a suitable design must eliminate the influence of interfering signals on 
its operation (for example pulses in the power grid or interference with a wireless connection).  It must 
be ensured that the pump is not overloaded and that a temperature increase will not affect the 
medium's physical properties.  
If the pump is installed as an auxiliary element outside the sampling apparatus, it must reliably ensure 
sufficient medium availability during all sampling modes.  
The manufacturer must specify the properties of the medium for which the pump is suited (especially 
content of particulates or other inhomogeneities).  When using the sampling apparatus, this 
specification must be taken into account.  
3.3 Power  
The sampling apparatus may be powered by the el ectrical grid or by an internal source.  For some 
especially important uses (nuclear power plants, etc.), power requirements are part of safety 
regulations.  Grid power must not affect measurement accuracy outside of permitted limits during 
expected grid def iciencies, and internal power must facilitate operation for the entire duration of the 
period between maintenance dates (capture medium replacement).  
3.4 Pipes and fittings  
Pipes and fittings must facilitate representative sampling of the medium.  Unobstruc ted passage must 
be guaranteed for the medium along the entire route to the sampling apparatus.  Pipes and fittings must 
not change the nature of the operating medium.  
3.5 Flow control  
The flow of the medium through the sampling apparatus must be controlled  at every instant of 
operation in a manner that ensures the sample is representative.  If this is not possible, the apparatus 
must switch to an error mode (to report an error, and if needed to cease sampling).  Measure of a General Nature No  0111 -OOP -C072 -16 
5 3.6 Sample capture mechanism  
The efficiency of collection into the capture medium must be known at every moment.  In the case of 
mechanical collection, an appropriate capture medium (filter type) must be chosen that will capture 
particles of the expected size and composition.  In the case of chemical sor ption, a filler (cartridge) 
type must be chosen that is suited to the expected chemical composition of the retained entity and 
guarantees sufficient temporal stability of the sorbent and retained entity for the entire duration of the 
sampling cycle until m easurement of the sample has been completed.  If the retained entity is 
chemically treated prior to capture (via a chemical reaction), constant efficiency of this reaction must 
be ensured for the entire duration of the sampling cycle.  Errors caused by chang es in capture 
efficiency must not exceed the maximum permissible error in the entire sampling, transport  and 
measurement procedure.  
3.7 Resistance of the apparatus to external influences  
The scope and type of external influences and the degree of resistanc e to them is agreed upon by the 
manufacturer and customer.  
3.8 Electromagnetic environment  
Sampling apparatuses are in principle intended for a class E2 electromagnetic environment 
(industrial).  Depending on customer requirements, a different environment m ay also be defined: 
however, the manufacturer must define the appropriate class for which type approval is requested prior 
to commencing testing.  
The apparatus must be capable of resisting the following electromagnetic conditions:  
 electrostatic discharges;  
 radiated high -frequency electromagnetic fields;  
 shocks;  
 rapid electrical surges (transients).  
3.9 Measuring instrument safety  
The sampling apparatus must be designed and installed so that it cannot pose a threat to individuals in 
its immediate vicinity.  The apparatus must be installed in a way that prevents unauthorised access to 
stored flow control parameters.  An instrument measuring the total amount of medium flow must stop 
at the final value during any sampling outage.  
4 Measuring instrument labels  
4.1 Markings on the measuring instrument  
The measuring instrument must have a data plate with at least the following information:  
a) model and serial number;  
b) in the case of external power, the power voltage;  
c) type-approval mark.  
Following its installation in the m easurement system, these marks need not be routinely accessible.  
4.2 Official mark placement  
The official mark is situated so that it is visible upon cursory examination.  It may be situated beside 
the data plate, on the face of the indication device, or in  the installation location near the instrument in 
a manner that makes it clear that the mark relates to the installed measuring instrument.  Measure of a General Nature No  0111 -OOP -C072 -16 
6 5 Type approval of the measuring instrument  
During type approval, the following tests are performed:  
 external inspec tion; 
 a test of constancy of the configured medium flow;  
 a test of the correct control of the medium flow;  
 a test of the response to increased resistance of the medium flow (increased pressure differential 
at the filter);  
 a leak test;  
 a test that the mediu m flow amount is measured correctly;  
 a check of sampling efficacy;  
 a check of chemical treatment efficacy (if it is part of the sampling apparatus);  
 a test of resistance to environmental influences (climatic tests);  
 tests of elecromagnetic resistance and e ffects of power supply.  
5.1 External inspection  
The following shall be assessed during an external inspection:  
 completeness of technical documentation ; 
 the completeness and condition of the sampling apparatus according to supplied technical 
documentation . 
5.2 Test conditions during type approval  
Tests performed under reference conditions must be performed under the following conditions (normal 
test conditions):  
 initial running time ≥ 30 minutes;  
 ambient temperature 18 –22 °C; 
 relative air humidity 50  %–75 %; 
 air pressure 86 –106 kPa; 
 power voltage UN ±1 %; 
 sampling flow rate —nominal flow rate ±5  %; 
 control elements set for normal operation.  
5.3 Basic functional tests  
5.3.1 Configured medium flow permanency test  
A device for measuring volume or a flow meter cal ibrated for the given measurement conditions with 
accuracy better than 2  % (k = 2) is installed into the liquid flow circuit (of the measured medium).  If 
the medium is a liquid, the flow can be determined using measuring containers, or the amount of 
(sampl ed) liquid can be determined by weighing it.  
The flow pump is switched on, and following a 30 -minute initial running period the flow is measured 
after 1, 5, 10, and 100  hours have passed.  Instead of flow, the amount of medium collected (capture 
medium) can  be read.  Read values must not differ from the rated flow or prescribed amount of capture 
medium by more than 5  %. Measure of a General Nature No  0111 -OOP -C072 -16 
7 5.3.2 Medium flow control test  
The sampling apparatus is connected to piping before the inflow of the tested medium, and a control 
signal is connected to the flow control input (the control signal depends on the design of the sampling 
apparatus; either there are built -in terminals for analogue control, or control takes place digitally via an 
input to the control computer).  The test is performed  according to the procedure in 5.3.1.  The control 
signal is configured so that the flow is at the lower value of the measurement range of the sampling 
apparatus, and then at a minimum of eight additional points up to the upper limit of the measurement 
range. The test points must be spaced equally (so that every quarter of the measurement range contains 
at least two test points).  Measured values of immediate flow through the sampling apparatus or the 
amount of capture medium taken off are compared with presc ribed values (if not agreed upon 
otherwise by the manufacturer and customer, prescribed values are proportional to the quantity 
controlled).  The difference between values at each point must not be greater than 10  %. 
5.3.3 A test of response to increased re sistance along the sampling route (reduced pressure at the 
filter)  
This test is performed only for a sampling apparatus in gas (air).  The purpose of this test is to 
determine the increase in the pressure drop at the filter causing a 10  % decline from the a ir flow rate 
under normal conditions.  An acceptable minimum pressure drop that can cause a 10  % decline from 
the rated flow rate must be agreed upon by the manufacturer and user.  
The flow meter is inserted in front of the monitor, and an adjustable limiter  (for example a valve) is 
inserted between the flow meter and the monitor input.  A calibrated pressure sensor is placed after the 
capture medium at the point stipulated by the manufacturer so that it measures the pressure drop in the 
monitor caused by air flow.  
The rated flow rate is measured during the specified pressure drop in the capture medium, then the 
adjustable limiter is configured to achieve a median flow rate value 10  % below the rated flow rate 
under normal test conditions.  Under these condition s, the conventionally true value of the sampling 
flow rate is measured.  
Under these conditions, the measured pressure drop and flow rate must meet the requirements.  
5.3.4 Air leak test  
Air or gas leakage prior to the flow rate meter must be less than 5  % of the rate flow rate.  
The size of the leak is measured using two volume meters or flow rate meters; they must be mutually 
calibrated to an accuracy greater than 1  %. One meter is situated before the apparatus and the second 
in the direction of flow past th e filter holder or another capture device and immediately before the 
flow rate meter built into the apparatus.  A series of 10 consecutive measurements are performed at 
suitable time intervals.  The median values of flow rates measured before and after must not differ by 
more than 5  % during a normal sampling period.  If needed, corrections for air pressure differences are 
performed.  
NOTE This test can be replaced by an air -tightness test performed on the apparatus.  Air pressure is increased in the sealed 
appa ratus, and an appropriate pressure meter is used to monitor the pressure drop for at least 10  minutes.  A calculation 
involving the amount of air sealed in the apparatus and the amount that escaped will determine the true amount of air that ha s 
escaped unde r the given conditions.  The value must not exceed 1  % of the flow under routine conditions.  
5.3.5 A test that the medium flow amount is measured correctly  
If the sample is part of the measured medium (this concerns liquids, where the sampled amount is the 
sample), the measuring instrument must count the entire amount of medium that has passed through.  
The deviation from the correct medium flow amount value must not exceed 10  %. 
The procedure is the same as in Article  5.3.2.  If flow is controlled, the test m ust be performed at both 
extremes of the measurement range and at a minimum of seven other points within the measurement 
range.  If the tested medium is gas (air), evaluation of stipulated quantities must be taken into account Measure of a General Nature No  0111 -OOP -C072 -16 
8 (volume under current conditio ns, under standard conditions  or evaluation of the mass of gas that has 
passed through).  
5.3.6 Sampling effectiveness (for gaseous media)  
Requirements  
Capture efficacy must not differ by more than 10  % from the value stipulated by the manufacturer for 
the given particle size.  
Particle size  
Particle diameter and the range of sizes used to measure capture efficacy of the sampling apparatus 
must be agreed upon by the manufacturer and users, for example, depending on the diameter of 
monitored aerosols, the capt ure efficacy of filter media depending on particle size, etc.  
Aerosol types  
Various aerosol types are suitable for use in capture efficacy tests, for example:  
 non-radioactive aerosols with particles containing a fluorescent indicator;  
 non-radioactive aeros ols containing latex or polystyrene balls;  
 radioactive aerosols.  
Test method  
Capture efficacy is tested by bringing an air sample containing particles with the suitable median 
aerodynamic diameter to the sampling pipe inlet.  Particle separation may have a small geometric 
standard deviation.  The sampling apparatus operates under normal test conditions, for example flow 
rate. 
After the sampling apparatus has been switched off, the amount of aerosol collected on the capture 
medium is determined.  The total amou nt of aerosol at the monitor inlet is also determined.  This is 
performed using an independent measurement of the sample amount of aerosol or by determining:  
 the amount of aerosols collected on interior surfaces of supply pipes and other surfaces of the 
air circuit in front of the capture medium;  
 the amount of aerosols past the capture medium.  
Determining sampling efficacy  
The sampling efficacy of the ( Em) of the monitor is calculated as follows:  
100
TM
mCCE
 (1) 
where  CM  ......  is the amount collected on the capture medium;  
 CT  .......  is the total amount of aerosol that has entered the monitor during the test.  
It is recommended that the total amount of aerosol ( CT) be determined by an alternative method as the 
median of obtained values.  These methods include  measuring the concentration of aerosols entering 
the apparatus using various measuring techniques, for example a spectrophotometer, a particle 
analyser, referenced sampling, etc.  
If the entire sampled aerosol is determined using the total amount of substa nce collected in the 
monitor, the total amount of aerosol ( CT) (activity, mass, or number of particles) is as follows:  
D U M T CCCC 
 (2) 
where  CU  .......  is the amount re -released from interior surfaces of the air circuit before the capture 
medium;  Measure of a General Nature No  0111 -OOP -C072 -16 
9  CD  .......  is the amount deposited past the capture medium.  
5.3.7 Chemical treatment efficacy test  
This test concerns only the sampling apparatus where prior to capture or during sampling part of the 
medium undergoes a chemical change.  
The efficacy of the chemical treatment and capture of the treated sample is stipulated by the 
manufacturer.  This efficacy must not diverge by more than 10  % from the declared value.  
The test procedure depends on the chemical form of the sampled medium and the changed chemical 
form.  Two procedures can be used:  
1) An initial chemical compound marked with a standardised amount of the measured (or 
analogous) radionuclide is introduced into the inlet pipes of the sampling apparatus (or part 
thereof that performs the chemical change).  The ef ficacy of the change in chemical composition 
and capture are determined through direct measurement of the capture medium.  
2) An inactive initial chemical compound is introduced into the inlet pipes of the sampling 
apparatus (or part thereof that performs t he chemical change).  The efficacy of the change and 
capture medium are determined through chemical analysis.  Chemical analysis can also be 
performed in the output pipe (or at the outlet of the part performing the chemical change) to 
determine the content o f the remaining initial compound.  In this case capture efficacy is 
determined chemically or via a chemical evaluation independent of this test.  
5.3.8 Test of resistance to environmental influences  
These tests are performed in a climate control chamber with  an open circuit if the medium is a gas 
(air), and with a closed circuit if the medium is a liquid.  
Because the sampling apparatus can be used in various environments, the range of operating 
conditions is specified by the manufacturer.  
The apparatus is pla ced in a climate control chamber and put into operation.  Climactic conditions are 
set pursuant to paragraph  5.2. Media flow is set to its operating value.If flow is controlled, the value is 
set to the bottom third of the measurement range.  
a) The set value is  maintained for at least four hours, and then the required number of flow 
measurements is made.  The internal meter measuring the amount that has flowed through is 
used to determine flow rate.  If the apparatus is intended for sampling a liquid and does not 
contain a flow meter, an external instrument measuring flow rate or amount that has flowed 
through must be used.  
b) Temperature tests  
The lower operating temperature limit and temperature change are then set so that the rate of 
change is not greater than 10  °C per hour.  Once the set temperature has been reached, 
Article  5.3.5 is followed.  
The temperature of the climate control chamber is set to the upper operating limit with a rate of 
temperature change of at most 10  °C per hour.  Once a stable temperature has been reached, a 
procedure analogous to that in a) is followed.  
Differences in flow rate at temperature limits compared to normal test conditions must not 
exceed 10  %. 
c) Test of resistance to changes in air humidity  
This test is performed only if the apparatu s can be expected to have significant sensitivity to air 
humidity.  
The test can be performed at a temperature of +35  °C and relative humidity of 90  %. A 
permitted deviation of 10 % of the value is in addition to the permitted deviation caused by 
temperatu re alone.  Measure of a General Nature No  0111 -OOP -C072 -16 
10 5.3.9 Power supply  
When supply voltage changes from 88  % to 110  % of the rated voltage, the flow rate of the medium 
must not change by more than ±5  %. The test is performed after connection to test equipment by 
changing supply voltage over the in dicated range.  The flow rate of the medium is measured pursuant 
to Article  5.3.2.  Measurement is performed once equilibrium has been reached after the voltage 
change.  
When power supply frequency changes from 47  Hz to 51  Hz, the flow rate of the medium must  not 
change by more than ±10  %. The test procedure is the same as for the supply voltage test.  This test 
need not be performed if the apparatus is powered by an inverter.  
5.3.10 Electromagnetic immunity and interference  
5.3.10.1 Radiated power line disturb ances  
The apparatus is operated under normal conditions.  A measuring receiver with detector is used to 
measure the level of disturbances on the power line for the phase and neutral conductor.  The 
measurement range is from 0.15  MHz to 30  MHz.  The quasi -peak  values of radiated disturbances 
must not exceed 56  dBµV (0.15 to 5  MHz) and 60  dBµV (5 to 30  MHz).  
5.3.10.2 Radiated fields  
The level of radiation at 10  m must not exceed 30  dBµV/m (30 to 230  MHz) and 37  dBµV (230 to 
1 000 MHz).  
5.3.10.2 Resistance to ele ctrostatic discharge  
The test is performed using the air method on a non -conductive surface and the contact method on the 
conductive parts of the apparatus.  The degree of rigour is 4  kV using the contact method and 8  kV 
using the air method.  
Discharges mus t not affect operation of the apparatus.  
5.3.10.3 Resistance to pulse groups  
Pulse groups are introduced directly into individual load and neutral (L, N) power conductors and into 
the protective earthing (PE) conductor.  
Pulse properties: pulse group width 15 ms, period 300  ms, pulse group repetition frequency 5  kHz, 
duration of positive and negative pulses 1  minute per conductor.Amplitude: 2  kV. 
Pulse groups must not affect operation of the apparatus.  
5.3.10.4 Resistance to electrical voltage surge  
The test  is performed by introducing a surge between the load and neutral (L, N) conductors and 
between (L, N) and the PE conductor.  
Surge properties: shape 1.2/50  µs (open -circuit voltage), 8/20  µs (short -circuit current), phase of the 
injected signal relative to  grid 0°, 90°, 270°, positive and negative polarity, a series of 5  surges.  
Amplitude ±1  kV (between L and N), ±2  kV (between L/N and the PE conductor).  
Surges must not affect operation of the apparatus.  
5.3.10.5 Resistance to conducted electromagnetic inte rference  
The test is performed for electromagnetic interference in the 150  kHz to 80  MHz frequency range, 
with 80  % modulation (1  kHz), with a 10  V degree of rigour.  
Electromagnetic interference must not affect operation of the apparatus.  Measure of a General Nature No  0111 -OOP -C072 -16 
11 5.3.10.6 Voltage dips and interruptions  
The test is performed for the following phenomena:  
a) a short interruption (for 5  000 ms); 
b) a voltage dip to 40  % Uτ (100 ms); 
c) voltage dip to 70  % Uτ (10 ms); 
d) a short interruption (10  ms) 
Operation can cease during the test if it is rest ored automatically or through operator intervention.  The 
measuring instrument must indicate that it has ceased operation.  
6 Initial verification  
6.1 Visual inspection  
A visual inspection is performed to check whether the apparatus is not obviously damaged and 
whether supply and outlet pipes and fixtures are no showing obvious signs of leakage.  
6.2 Functional tests  
6.2.1 Test equipment accuracy requirements  
The measuring instrument used to check the flow amount or flow rate must have a measurement 
accuracy b etter than ±2  %. For the stability and linearity test, an internal flow rate or flow volume 
meter can be used, if prior to verification this internal measuring instrument is calibrated to the given 
accuracy.  
6.2.2 Tests of sampling route efficacy (installe d apparatus)  
If sampling takes place at a location different from where the sampling apparatus is installed, and the 
medium is conducted through pipes, the sampling efficacy of the sampling route must be checked 
during initial verification.  For a gaseous m edium the test is performed pursuant to Article  5.3.6.  
However, given the variability of possible physical and chemical forms of samples collected by these 
sampling apparatuses, this test procedure cannot be generalised.  
The test can be replaced by an expe rt assessment that will prove that the supply pipes cannot affect the 
composition of the sampled medium with respect to the content of the entity under examination.  
6.2.3 A test that the medium flow amount is measured correctly  
Performed pursuant to Articl e 5.3.4.  This test can be replaced by a flow rate test or with proof that the 
measuring instrument flow rate was calibrated at an authorised facility.  
6.2.4 Medium flow control test  
Performed pursuant to Article  5.3.2.  This test cannot be replaced if flow through the apparatus is 
controlled (see 1.5).  
6.2.5 Air leak test  
Performed pursuant to Article  5.3.4.  
6.2.6 Chemical treatment efficacy test  
Performed pursuant to Article  5.3.7.  Measure of a General Nature No  0111 -OOP -C072 -16 
12 7 Subsequent verification  
For subsequent verification, the same tests as dur ing initial verification are performed, with the 
exception of the sampling route efficacy test (6.2.2).  This test is performed only when design changes 
have taken place along the sampling route.  
8 Measuring instrument check  
When checking measuring instrume nts pursuant to §  11a of the Metrology Act at the request of an 
entity that could be affected by its incorrect measurement, Chapter  7 is followed.  The maximum 
permissible error used is 1.25  times the maximum permissible errors pursuant to Chapter  7. 
9 Noti fied standards  
To specify metrological and technical requirements for measuring devices and to specify verification 
and type approval test methods stemming from this Measure of a General Nature, the CMI notifies 
Czech technical standards, other technical s tandards or technical documents of international or foreign 
organisations or other technical documents containing detailed technical requirements (hereinafter 
‘notified standards ’). The CMI shall publish a list of these notified standards attached to the r elevant 
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 considered, to the extent and under the 
conditions stipulate d by a general measure, to be compliance with the requirements stipulated by this 
measure to which these standards or parts thereof apply.  
Compliance with notified standards is one way of demonstrating compliance with the requirements.  
These requirements m ay 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 Metrology Act, towards the implementation of §  6(2), 
§ 9(1), § 9(9) and §  11a(3) of the Metrology Act, this general measure, stipulating metrological and 
technical requirements for the specified measuring instruments and test methods for the type approval 
and verification of the specified measuring instruments —'Measuring instruments used to monitor 
activity and concentration of effluents from nuclear facilities, from nuclear raw material mining or 
processing facilities, from the processing or application of radioactive materials, and from radioactive 
waste processi ng plants, and to determine environmental radiation exposure due to effluents' —
modules for discontinuous measurement of activity or concentration by sampling that require specific 
test procedures and methods during type approval and during the verification  of these specified 
measuring instruments.  
Decree  No 345/2002, stipulating measuring instruments for mandatory verification and measuring 
instruments subject to type approval, as amended, classifies this type of measuring instrument as a 
measuring instrume nt subject to type approval and verification under item  8.1 in the Annex ’s 'List of 
Specified Measuring Device Types'.  
This legislation (Measure of a General Nature) will be presented in accordance with Directive 
(EU)  2015/1535 of the European Parliament a nd of the Council of 9  September  2015 defining the 
procedure for the provision of information in the field of technical regulations and of rules on 
Information Society services.  Measure of a General Nature No  0111 -OOP -C072 -16 
13 III. 
I N S T R U C T I O N S 
In accordance with §  172(l), in conjunction with § 39(l) CAP, 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 dr aft Measure of a General Nature. With  
a view to the provisions of §  172(4) CAP, the comments shall be submitted in writing.  
In accordance with §  174(l) CAP in conjunction with §  37(l) CAP, it must be clear who is making the 
comments, which measure of a gen eral nature they concern, how it contradicts legislation or how the 
measure of a general nature is inaccurate, and they must be signed by the person making them.  
The supporting documents for this draft Measure of a General Nature may be consulted at the Cz ech 
Metrology Institute, Legal Metrology Department, Okružní  31, 638  00 Brno, after making 
arrangements by telephone.  
This general measure shall be posted for 15  days.  
 
 
 
 
 
 
 ...………………………… ..............  
RNDr.Pavel Klenovský  
Director -General  
 
 
Person respo nsible for accuracy:  Mgr.  Tomáš Hendrych  
 
Posted on:  
Signature of the authorised person confirming posting:....................................................  
 
Removed on:  
Signature of the authorised person confirming removal:............................. .......................