Czech Metrology Institute  
Okružní 31,  638 00 
Brno 
1. ------IND- 2010 0349 CZ- EN- ------ 20100622 --- --- PROJET 
 The Czech Metrology Institute (CMI), as the comp etent local body for stipulating metrological and 
technical requirements for a specified measuring devi ce and for the stipulation of test methods for type 
approval and for verification of a specified measur ing device pursuant to Section 14(1) of Act No. 
505/1990 Coll., on Metrology, as amended, and pursua nt to provisions of Section 172 et seq. of Act 
No. 500/2004 Coll., the Administrative Code, as amende d (hereinafter the "AC"), has on 26 February 
2010 commenced ex officio proceed ings pursuant to Section 46 of the AC, and based on supporting 
documents issues this: 
 
I. 
M E A S U R E  O F  A  G E N E R A L  N A T U R E 
number: 0111-OOP-C009-10 
reference no. 0313/002/10/Pos., 
publication date: 26 February 2010 
 
stipulating metrological and technical requirements for specified measuring devices, including 
test methods for verifying specified measuring devices: 
"automatic level gauges and automatic level gauges with automatic checking of metrological 
parameters" 
 
1   Basic definitions 
For the purposes of this measure of a general natu re, terminology and defini tions contained in the 
VIM1) and the following apply: 
1.1   automatic level gauge, level gauge: an apparatus for the automatic measurement and display of 
fluid level with respect to a fixed reference point 
1.2   automatic level gauge with automatic checking of metrological parameters:  an automatic 
level gauge that is capable of automatically pe rforming a regular check of metrological properties 
1.3   fluid level sensor: an element that detects the surface of a fluid and provides information regard-
ing its level 
1.4   indicating device: a device that displays the measured fluid level value on an ongoing basis 
1.5   transducer: a device that converts the fluid level value to fluid volume in a tank using the tank's 
calibration table 
1.6   correction sensor: a sensor that measures relevant propert ies of the liquid and/or environment 
above the surface of the fluid in order to correct fluid level measurements 
                                                      
1)   International Vocabulary of Metrology - Basic and General Concepts and Associated Terms (VIM). Measure of a General Nature No. 0111-OOP-C009-10 
2 1.7   measurement range:  a set of values stipulated by the manufacturer that can be measured by a 
given level gauge with a specified instru ment uncertainty under defined conditions 
1.8   dipping datum point: the intersection of the vertical measurement axis and the upper surface of 
the dip plate, or with the bottom surface of the tank if a dip plate is not provided. It constitutes the 
origin for the measurement of liquid levels 
1.9   upper reference point: a clearly marked point above the surface of the measured liquid in the 
tank near the vertical measurement axis that p asses through the base point, used as a reference to 
measure ullage 
1.10   dip: the vertical distance between the dipping datum point and the liquid level in the tank 
1.11   ullage:  the vertical distance between the surface of  the liquid in the tank and the upper reference 
point measured along the measurement axis 
1.12   gauge reference length: the distance between the dipping datum point and the zero point of the 
level gauge 
1.13   checking facility: a facility included in an automatic el ectronic level gauge that permits the 
following events to be detected and acted upon: 
– significant faults, and/or 
– incorrect functionality of a specific level gauge device, and/or 
– disruption of communication between individual level gauge devices 
1.14   automatic checking facility: a checking facility that functions without the need for human in-
tervention 
1.15   permanent automatic checking facility (type P): An automatic checking facility that operates 
during each measurement cycle. 
1.16   intermittent automatic checking facility (type I): An automatic checking facility that operates 
at certain time intervals or per fixed number of measurement cycles. 
2   Metrological requirements 
Metrological requirements are based on the require ments of recommendation OIML R 85 "Automatic 
level gauges for measuring the level of  liquid in stationary storage tanks 2)". 
2.1   Rated operating conditions 
Automatic level gauges must function properly within  an ambient temperature range specified by the 
manufacturer as an operating temperature range, which must be at least -25 °C to 55 °C 
Level gauges must not be sensitive to relative humidit y of the surrounding air, and must work properly 
at a relative humidity of up to 93%. 
Reference laboratory conditions for le vel gauge tests are temperature ( 20 ± 5) °C and relative humidity 
of up to 85%. 
                                                      
2)   OIML R 85 "Automatic level gauges for measuring the level of liquid in fixed storage tanks" – available to 
the public at  www.oiml.org Measure of a General Nature No. 0111-OOP-C009-10 
3 2.2   Maximum permissible error 
The maximum permissible error applies according to the automatic level gauge's measurement princi-
ple for indication of dip or ullage. 
2.2.1    Maximum permissible error during verification 
The maximum permissible measurement error of a le vel gauge before its installation in a tank is 
± 1 mm. 
2.2.2    Maximum permissible error during operation 
The maximum permissible measurement error of a level gauge after its installation in a tank is 
± 4 mm. 
2.3   Hysteresis 
Errors resulting from hysteresis during changes in su rface level movement direction must not exceed 1 
mm. 
2.4   Resolution 
The level gauge must have a resolution of less than 1 mm. 
3   Technical requirements 
Technical requirements are based on the requirements of recommendation OIML R 85 "Automatic 
level gauges for measuring the level of  liquid in stationary storage tanks 2)". 
3.1   Level gauge design 
An automatic level gauge contains at least a fluid level sensor, a transducer and an indicating device. 
It must be manufactured of solid, lasting materials without internal tensions, reasonably resistant to 
corrosion, the chemical effects of measured liquids and their vapours. 
It must be capable of permanently resisting pressu re, temperature and other operating conditions in the 
tank without functional failure or changes to metrological characteristics. 
The minimum measurable distance to the fluid level from the dipping datum point must be known and 
indicated on the nameplate of the level gauge, if this value is greater than zero. 
3.2   Fluid level sensor 
For automatic level gauges with movable elements (e.g. float type), the movable element must be se-
cured against intentional restriction of movement by  the user. If such a movable element can be placed 
above or below the measured surface over a long te rm (e.g. for operational reasons), the level gauge 
must indicate that at that given instance it is not measuring the true surface level. 
3.3   Indicating devices 
If several indicating devices are used, each must meet the maximum allowable error requirements of 
Section 2.2. The difference between two indications under stable conditions must not be greater than 1 
mm. 
A remote indicating device must uniquely identify th e corresponding automatic level gauge to which it 
belongs. 
                                                      
 Measure of a General Nature No. 0111-OOP-C009-10 
4 An automatic level gauge must display fluid level. The same display can show other measured values, 
such as ullage, as long as this data is automatically replaced by  fluid level data within 10 seconds. 
Ullage data must be available for metrological purposes. 
During regular operation, reading of measurement results must be reliable, easy and unambiguous. 
Measurement results must contain the names or sym bols of the units of length in which they are ex-
pressed. Indication device divisions must be 1 × 10n, 2 × 10n or 5 × 10n units of length, where n is a 
positive or negative whole number or zero. 
3.4   Level gauge installation 
Following installation, indication of measurement results must be easily accessible and legible. 
The level gauge must be installed to permit checking of metrological parameter settings at the installa-
tion location. 
If the tank has areas where the volume cannot be dete rmined from dip and the tank's calibration table, 
the indicated dip values must be clearly differentiated from other values. 
The level gauge must be installed so that the resulta nt influence of eddies, currents, turbulence, foam, 
condensation, changes to operating conditions, asymme trical heating, wind and other influences on the 
level gauge's measurement is negligible. If need ed, it must be protected from these influences. 
An automatic level gauge must be installed on a ta nk in such a way that th e discrepancy between the 
gauge reference length and the surface caused by movements of tank walls, bottom and top or stilling 
tubes does not exceed the maximum permissible operating error according to Section 2.2.2, otherwise 
these movements must be compensated for. 
The level gauge must be installed in such a way that the fluid level sensor or measurement are not 
affected by obstructions in the tank 
The effect of thermal expansion of the tank or structur al tubing of the level gauge must be sufficiently 
small, or must be compensated for in such a way th at temperature changes do no t lead to the transgres-
sion of maximum permissible erro rs in measured fluid level. 
If a correction sensor is available, it must be insta lled so that it measures appropriate values that influ-
ence magnitudes. If needed, several sensors may be installed to gain appropriate average correction 
values. 
3.5   Auxiliary devices 
Auxiliary devices that perform special functions in processing, transmitting or displaying measure-
ment results may, for example, be connected to: 
– a printing device, 
– a memory device, 
– a conversion device. 
Connection of such devices, be it temporary or pe rmanent, must not change the metrological charac-
teristics of the gauge. These devices must not ha ve characteristics permitting fraudulent use of the 
gauge. 
3.6    Automatic checking of metrological parameters 
Automatic checking of metrological parameters cons ists of the periodic checking of metrological pa-
rameters of the level gauge under the following conditions: 
– during the check, the level gauge is compared to an independent length reference that is part 
of the measurement system, Measure of a General Nature No. 0111-OOP-C009-10 
5 – it is performed automatically at least once a day or upon each movement of fluid in the tank, 
depending on which comes first, 
– the result is not used for level gauge measurement correction. 
If the measurement error compared to the refere nce exceeds the maximum permissible error of the 
level gauge, the device must signal this state and record it in the gauge memory. 
3.7   Ensuring measurement reliability 3.7.1   In general 
An automatic level gauge must be equipped with a type I or P checking facility to prevent or signal 
significant errors.  
3.7.2    Prevention or si gnalling of significant errors 
An automatic level gauge must be designed and manuf actured in such a way that it and its constituent 
parts do not exhibit significant errors when subjected to specified disruptive influences, or in such a 
way that these significant errors are detected by th e checking facility and a visual and/or acoustical 
alarm is triggered that lasts until a user takes necessar y steps to correct this error, or arranges for such 
steps to be taken. 
During measurement, the checking facility must detect and immediately signal significant errors 
caused by the disruptive influences of: 
– radiated electromagnetic fields at radio frequencies, 
– conducted electromagnetic fields at radio frequencies, 
– electrostatic discharge, 
– bursts (transients) on signal, data and control lines, 
– surges on signal, data and control lines, 
– mains voltage dips, short interr uptions and voltage variations, 
– bursts (transients) on mains 
– mains voltage ripple. 
During measurement, the checking facility must de tect and, after completing measurement, signal 
errors caused by the disruptive influences of: 
– variable humidity and temperature, 
– mains surges. 
3.7.3    Signalling data loss or distortion 
The checking facility must, by signalling the loss or distortion of data, permit the detection and ad-
dressing of: 
– improper functionality of the level gauge or a part thereof, 
– disrupted communication between le vel gauge devices or components. 
If the checking facility detects the risk of data loss or  distortion, an automatic visual and/or acoustical 
alarm is immediately triggered that lasts until a user takes necessary steps to co rrect this error, or ar-
ranges for such steps to be taken. 
The design and construction of an automatic level ga uge must ensure that data and commands perma-
nently stored in the memory are always correct. Measure of a General Nature No. 0111-OOP-C009-10 
6 The integrity of all relevant measured data must be  checked any time it is internally transmitted or 
stored, or sent via an interface to an ex ternal device, using measures such as: 
– parity bit, 
– check sum, 
– independent redundant storage, 
– a different communication protocol with repeated transmission. 
3.8    Protection from unauthorized manipulation 
An automatic level gauge must be built in such a way that the measuring or indicating apparatus can-
not be interfered with in a way that could influen ce measurement integrity without visible damage to 
the verification mark. 
4   Gauge labelling 
4.1   Gauge labelling 
The nameplate of an automatic level gauge must state the following: 
– the manufacturer's name or logo, 
– type, 
– serial number and year of manufacture, 
– type approval label, 
– measurement range 
A remote indicating device must be labelled with the following: 
– type approval number, 
– tank identification. 
4.2   Verification marks 
The level gauge must have the necessary number of places for verification marks, allowing easy appli-
cation and visual inspection without having to disassemble the device. 
5   Type approval 
5.1   In general 
The approval process for an automatic level gauge includes the following tests: 
a) external inspection; 
b) laboratory tests of the level gauge; 
c) tests of the resistance of the level gauge to  disruptive influences of the surrounding environ-
ment; 
d) a test of the automatic checking of metrological parameters function; 
e) a test of the conversion unit. 
5.2   External inspection 
The following is assessed durin g an external inspection: 
– that prescribed technical documentation is complete; Measure of a General Nature No. 0111-OOP-C009-10 
7 – that metrological and technical characteristics specified by the manufacturer in documentation 
conform to the requirements of this regulation listed in sections 2 and 3; 
– that the level gauge's functional wholes are comp lete and in accordance with prescribed tech-
nical documentation; 
– that the software version of the level gauge is  the same as the version specified by the manu-
facturer. 
5.3   Laboratory tests of the level gauge 
5.3.1   Test equipment 
The uncertainty of test equipment used to perform  accuracy, resolution and hysteresis testing must be 
equal to or smaller than one fifth of the maxi mum permissible error according to Section 2.2.1. 
5.3.2   Accuracy test 
The accuracy of a level gauge is tested at least 10 fluid level points between the limits of the gauge 
measurement range, including its lower limit. At eac h point, measurement errors of the level gauge 
under test are calculated. 
During the accuracy test, level gauge errors must not exceed the maximum permissible error listed in 
Section 2.2.1. 
5.3.3   Resolution test 
Level gauge resolution is tested at three fluid leve l points, including the lower limit of the level gauge 
range. 
During the resolution test, level gauge errors must not exceed the maximum permissible error listed in 
Section 2.4. 
5.3.4   Hysteresis test 
The level gauge hysteresis test is performed at thre e fluid level points. During the hysteresis test, the 
fluid level is moved in both directions by at l east 1/10 of the level gauge's measurement range. 
During the hysteresis test, level gauge errors must not exceed the maximum permissible error listed in 
Section 2.3. 
5.4   Tests of the resistance of the level gauge to disruptive influences of the surrounding envi-
ronment 
5.4.1    Tests of resistance to climactic influences 5.4.1.1    Limit temperatures test 
Resistance to ambient temperature limits is tested with the level gauge switched on: 
a) with dry heat at a temperature of 55 °C for 2 hours, 
b) with cold at a temperature of -25 °C for 2 hours. 
After the specified time has passed, an accuracy test at the given limit temperature is performed at 
three points of the measurement range, and hysteresis and resolution tests at one point of the meas-urement range of the level gauge. Measurement errors must not exceed the greatest permissible error 
according to Section 2.2.1, 2.3 and 2.4. 
5.4.1.2   Humidity test 
Resistance to humidity is tested on level gauges that ha ve been switched off by cycling wet heat in two 
24 hr cycles at a maximum temperature of 55 °C and a relative humidity greater than 95 %. Measure of a General Nature No. 0111-OOP-C009-10 
8 After both cycles have completed, no significant errors  may occur, or they must be detected and cor-
rected by the checking facility. 
5.4.2   Limit power voltages test 
Resistance to limit power voltage values are tested with the level gauge switched on. For DC, these 
limits are given by manufacturer specifications, for AC these limits are UN – 15 % and UN + 10 %, 
where UN is the nominal power voltage. 
Measurement errors must not exceed the greatest perm issible error according to Section 2.2.1 at limit 
power voltage values. 
5.4.3   Electromagnetic compatibility (EMC) tests 
5.4.3.1    Resistance to radiated electromagnetic fields at radio frequencies 
Resistance to a radiated high-frequency electromagnetic  field is tested with the level gauge switched 
on. The level gauge is subjected to an electroma gnetic field in the 80 MHz to 2 GHz frequency range 
with test field intensity amplitude of 10 V/m and 80% amplitude modulation with a 1 kHz sinus wave. 
During interference, at least one accuracy test mu st be performed at roughly halfway along the meas-
urement interval. No serious errors may occur during th is test, or they must be detected and corrected 
by the checking facility. 
5.4.3.2   Resistance to interference caused by  power lines, induced by high-frequency fields 
Resistance to interference caused by power lines, induced by high-frequenc y fields is tested with the 
level gauge switched on, between a frequency range of  150 kHz to 80 MHz at a test voltage amplitude 
of 10 V. Interference is applied to all inputs and outputs and to gauge power. 
During interference, at least one accuracy test mu st be performed at roughly halfway along the meas-
urement interval. No serious errors may occur during th is test, or they must be detected and corrected 
by the checking facility. 
5.4.3.3   Resistance to electrostatic discharge 
Resistance to electrostatic discharge is tested with  the level gauge switched on, preferably with a con-
tact discharge of 6 kV applied to a conductive section of the meter or with an 8 kV air discharge ap-
plied to coupling plates near the gauge. 
During interference, at least one accuracy test mu st be performed at roughly halfway along the meas-
urement interval. No serious errors may occur during th is test, or they must be detected and corrected 
by the checking facility. 
5.4.3.4    Resistance to bursts (transi ents) on signal, data and control lines 
Resistance to rapid transient el ectrical phenomena/impulse groups is tested with the level gauge 
switched on at a test voltage of ± 1 kV on signal te rminals with a repeat frequency of 5 kHz. Interfer-
ence is applied to all gauge inputs and outputs. 
During interference, at least one accuracy test mu st be performed at roughly halfway along the meas-
urement interval. No serious errors may occur during th is test, or they must be detected and corrected 
by the checking facility. 
5.4.3.5    Resistance to surges on signal, data and control lines 
Resistance to surges is tested with the level gauge  switched on by applying at least three positive and 
three negative voltage surges: 
– asymmetrical line for line – line 0.5 kV, 
– asymmetrical line for line – ground 1.0 kV, Measure of a General Nature No. 0111-OOP-C009-10 
9 – symmetrical line for line – ground 1.0 kV. 
During interference, at least one accuracy test mu st be performed at roughly halfway along the meas-
urement interval. No serious errors may occur during th is test, or they must be detected and corrected 
by the checking facility. 
5.4.3.6    Resistance to AC mains voltage dips, short interruptions and voltage variations 
Resistance to short AC voltage gips, short interruptions  and slow voltage variations are tested with the 
level gauge switched on at all AC power inputs by applying a voltage reduction: 
– of 100% of UN for 0.5 of an AC voltage cycle, 
– of 100% of UN for 1 AC voltage cycle, 
– of 60% of UN for 10 AC voltage cycles, 
– of 30% of UN for 25 AC voltage cycles, 
– of 20% of UN for 250 AC voltage cycles. 
and a power outage simulated by a voltage reduction of 100% of UN for 250 AC voltage cycles, where 
UN is the nominal value of AC mains voltage. 
During interference, at least one accuracy test mu st be performed at roughly halfway along the meas-
urement interval. No serious errors may occur during th is test, or they must be detected and corrected 
by the checking facility. 
5.4.3.7   Resistance to bursts (transients) on mains 
Resistance to rapid transient el ectrical phenomena/impulse groups is tested with the level gauge 
switched on at a test voltage of ± 2 kV on signal terminals for at least 1 minute for each amplitude and 
polarity with a repeat frequency of 5 kHz.  
During interference, at least one accuracy test mu st be performed at roughly halfway along the meas-
urement interval. No serious errors may occur during th is test, or they must be detected and corrected 
by the checking facility. 
5.4.3.8   Resistance to DC mains voltage dips, short interruptions and voltage variations 
Resistance to short DC voltage gips, short interruptions  and slow voltage variations are tested with the 
level gauge switched on at all DC power inputs. A series of three disturbances at least 10 seconds 
apart are applied, at the following voltage levels: 
– 40 % of UN for 0.1 s;  
– 70% of UN for 0.1 s; 
– 0 % of UN for 0.01 s; 
– 85 % of UN for u 10 s; 
– 120 % of UN for 10 s. 
During interference, at least one accuracy test mu st be performed at roughly halfway along the meas-
urement interval. No serious errors may occur during th is test, or they must be detected and corrected 
by the checking facility. 
5.4.3.9    Resistance to DC voltage ripple 
The voltage ripple is a sinusoid whose amplitude is 2% of mains voltage. The interference is applied 
for at least 10 minutes and for the entire time of the test of the gauge. 
During interference, at least one accuracy test mu st be performed at roughly halfway along the meas-
urement interval. No serious errors may occur during th is test, or they must be detected and corrected 
by the checking facility. Measure of a General Nature No. 0111-OOP-C009-10 
10 5.4.3.10    Resistance to surges on mains 
Interference is composed of three positive and th ree negative voltage impulses. For AC, pulses must 
be applied synchronously with AC power for phase shifts of 0° , 90°, 180° and 270°. Voltage ampli-
tude is 1.0 kV for line – line and 2.0 kV for line – ground. 
Immediately after interference, at least one accuracy  test must be performed at roughly halfway along 
the measurement interval. No serious errors may occu r during this test, or they must be detected and 
corrected by the checking facility. 
5.5    Test of the automatic checking of metrological parameters 
If the manufacturer declares that the level gauge is  equipped with automatic checking of metrological 
parameters, it is investigated whether this function meets the requirements of Section 3.4. If this func-
tion meets prescribed parameters, this is stated in the type approval certificate, where the method of 
automatic checking of metrological parameters used is described, as well as the manner in which it 
should be tested during initial and subsequent verification. 
5.6   Conversion unit test 
If the level gauge is equipped with a built-in or auxiliary conversion unit that uses tank calibration 
tables to convert fluid level to fluid volume, also  if it uses attached measuring devices for measuring 
temperature to automatically convert to volume at re ference temperature, this conversion unit is tested 
from the perspective of its functionality and from the perspective of storage of tank calibration tables 
in the conversion unit. 
If attached measuring devices (e.g. a thermometer or  pressure meter) are used as inputs to the conver-
sion unit for correction or conversion of measured data, they must be included in the type approval of 
the level gauge; if they are subject to type appr oval on their own, during le vel gauge type approval it 
must be assessed whether their connection does not influence the metrological characteristics of the 
level gauge. 
6   Initial verification 
6.1   In general 
The following is performed during initial verification of level gauges: 
c) a visual inspection of the level gauge and connected devices; 
d) laboratory tests of the level gauge and connected devices; 
e) installation in a tank, setting of the reference point, settings check; 
f) sealing with a verification mark. 
6.2   Visual inspection 
During the visual inspection, the level gauge and connected devices submitted for verification are as-
sessed as to whether they correspond to the approved type, and whether they are not physically dam-
aged. 
6.3   Laboratory tests of the level gauge 6.3.1   Test equipment 
The uncertainty of test equipment used to perform  accuracy, resolution and hysteresis testing must be 
equal to or smaller than one fifth of the maxi mum permissible error according to Section 2.2.1. Measure of a General Nature No. 0111-OOP-C009-10 
11 6.3.2   Accuracy test 
The accuracy of a level gauge is tested at least 10 fluid level points between the limits of the gauge 
measurement range, including its lower limit. At eac h point, measurement errors of the level gauge 
under test are calculated. 
During the accuracy test, level gauge errors must not exceed the maximum permissible error listed in 
Section 2.2.1. 
6.3.3   Resolution test 
Level gauge resolution is tested at three fluid leve l points, including the lower limit of the level gauge 
range. 
During the resolution test, level gauge errors must not exceed the maximum permissible error listed in 
Section 2.4. 
6.3.4   Hysteresis test 
The level gauge hysteresis test is performed at thre e fluid level points. During the hysteresis test, the 
fluid level is moved in both directions by at l east 1/10 of the level gauge's measurement range. 
During the hysteresis test, level gauge errors must not exceed the maximum permissible error listed in 
Section 2.3. 
6.3.5    Test of the automatic checking of metrological parameters 
If the level gauge is equipped with automatic checki ng of metrological parameters, a test of this func-
tion is performed (according to the procedur e listed in the type approval certificate). 
6.3.6    Test of connected measuring devices 
If attached measuring devices (e.g. a thermometer or  pressure meter) are used as inputs to the conver-
sion unit for correction or conversion of measured data , their verification is pe rformed or arranged if 
their verification has not been performed independen tly and if the verification validity is not guaran-
teed for the validity period of the verification of the level gauge. 
6.4    Setup and sealing at the installation location 
After installation on the tank, the reference point is  set, level gauge confi guration and communication 
with connected measuring devices are checked, and th e entire measuring system is sealed with verifi-
cation marks. 
7   Subsequent verification 
Subsequent verification is performed using the sam e procedure as initial verification according to Sec-
tion 6. 
8   Notified standards 
To specify metrological and technical requirements for measuring devices and to specify verification test methods stemming from this measure of a gene ral nature, the CMI notifies Czech technical stan-
dards, other technical standards or technical documen ts of international or foreign organizations or 
other technical documents containing detailed tec hnical requirements (hereinafter "notified stan-
dards"). The CMI shall publish a list of these notifie d standards, with their assignation to relevant 
measures, along with the measure of a general nature , in a manner available to the public (on the web-
site www.cmi.cz). Measure of a General Nature No. 0111-OOP-C009-10 
12 Compliance with notified standards or parts thereof is considered to be, to the extent and under the 
conditions stipulated by a measure of a general nature, to be compliance with those requirements 
stipulated by this measure to which these standards or parts thereof apply. 
 Measure of a General Nature No. 0111-OOP-C009-10 
13 II. 
J U S T I F I C A T I O N  
Towards the implementation of Section 24c of Act No. 505/1990 Coll., on metrology, as amended, the 
CMI issues this measure of a general nature, sti pulating metrological and te chnical requirements for 
specified measuring devices and test methods for verification of these specified measuring devices. 
In Decree No. 345/2002 Coll., specifying measuring devices for mandatory verification and measuring 
devices subject to type approval, as amended, the annex "List of Specified Measuring Device Types" 
classifies automatic level gauges and automatic leve l gauges with automatic checking of metrological 
parameters under item 1.1.7 as measuring devices subject to type approval and verification. 
Towards the implementation of Section 24c of Act No . 505/1990 Coll., on metrology, as amended, for 
the measuring device type specified as "alcohol meters used to measure the volume of alcohol pro-duced", the CMI thus issues this measure of a gene ral nature, stipulating metrological and technical 
requirements for automatic level gauges and automa tic level gauges with automatic checking of met-
rological parameters and test methods for type a pproval and verification of these specified measuring 
devices. 
  
III. 
E F F E C T I V E  D A T E 
This measure of a general nature takes effect on th e fifteenth day following the day of its publication 
(Section 24d of Act No. 505/1990 Coll., on metrology, as amended).