Law 3/1985, of March 18, of Metrology, establishes the legal regime of the metrological activity in Spain, to which they must submit in defense of the safety, the protection of the health and the economic interests of the consumers and users, the measuring instruments, under the conditions which they are determined to determine. This Law was subsequently developed by various norms of metrological content, among which is the Royal Decree 1616/1985 of 11 September, which establishes the metrological control carried out by the State Administration.

The Order of the Ministry of Public Works and Urban Planning, of 28 December 1988, regulated the metrological control of the pneumatic gauges of motor vehicles in their phases of model approval and verification primitive. The phases of verification after repair or modification and periodic verification of these instruments were regulated by the Order of the Ministry of Public Works, Transport and the Environment of 25 April 1995.

The metrological control phases established by the two aforementioned Orders affect only the non-equipped manometers of electronic components. For this reason, this Order is intended to regulate the various phases of the metrological control of the manometers which are fully or partially equipped with these components.

All electronic manometers are subject to the metrological control of the State established in this Order, in the phases of approval of the model and of the primitive verification, given that in these first two phases it is not distinguished the subsequent use, public or private, of electronic manometers. However, with regard to the verification phases after repair or modification and periodic verification, only electronic manometers of public use are affected by the Order which is now approved, so that they remain out of their field of application those of private use, given the material impossibility of their control and the fact that these have already been the object of the corresponding controls of approval of the model and of the primitive verification. However, the Order itself provides for the possibility for holders of private electronic manometers to be able, voluntarily, to submit them to verification checks after repair or modification, and for periodic verification.

The processing of this Order has been followed by the procedure for information on technical standards and regulations laid down in Directive 83 /189/EEC of 28 March of the European Parliament and of the Council and of the European Parliament. Decree 1168/1995 of 7 July.

In its virtue, I have:

CHAPTER I

Application, merchandising, and free field

circulation

Article 1. Field of application.

1. This Order is intended to regulate the metrological control of the State, established by Law 3/1985 of 18 March, of Metrology, and Royal Decree 1616/1985 of 11 September, of public manometers which are fully or partially endowed with electronic components, whether or not fitted with pre-determination devices, intended to measure the pressure of the tyres of motor vehicles, hereinafter referred to as electronic tyres for tyres.

2. By way of derogation from the preceding subparagraph, holders of private manometers may voluntarily submit them to the verification phases after repair or modification and periodic verification, which are regulated in this Order.

Article 2. Phases of metrological control.

State metrological control over electronic tyre gauges, to be carried out in accordance with the provisions of Law 3/1985, of 18 March, of Metrology, in Royal Decree 1616/1985 of 11 September 1985, and In this Order, it will consist of the following phases: Model approval, primitive verification, verification after repair or modification and periodic verification.

Article 3. Placing on the market and putting into service.

From the date of entry into force of this Order only electronic gauges for tyres referred to in Article 1 which comply with the provisions of this Order may be placed on the market and put into service, provided that are properly installed and maintained and used in accordance with their purpose.

Article 4. Free movement.

1. For the purposes of the foregoing Article, compliance with the requirements laid down in Annex I to this Order shall be presumed to be for electronic tyres for tyres from other Member States of the European Union or originating in other States which are signatories to the Agreement on the European Economic Area, which comply with the technical rules, rules or procedures legally established in those States, or have been tested in laboratories or approved bodies or have received a certificate from these bodies, provided the levels of accuracy, safety, fitness and suitability are equivalent to those required in this Order.

2. The competent public authority may request the necessary documentation to determine the equivalence referred to in the previous paragraph. Where the non-compliance with the essential requirements laid down in that Annex is established, the competent public administration may withdraw electronic pressure gauges from the market.

CHAPTER II

Model Approval

Article 5. Request.

Manufacturers, importers or any person who may fulfil the obligations arising from the approval of a model may apply for it in accordance with the provisions of Royal Decree 1616/1985 of 11 September 1985 and in the Order.

Article 6. Execution.

The approval of the model shall be carried out by the authorised services or bodies of the competent public administrations, which have the technically qualified laboratories and personnel required to carry out the tasks set out in this Order.

Article 7. Requirements.

The model approval will be granted once the formal requirements required by the title of Royal Decree 1616/1985, of 11 September, establishing the metrological control that is carried out by the State administration, as well as the metrological requirements and technical characteristics set out in Annex I to this Order, and after successful completion of the tests referred to in Annex II, No 1.

Article 8. Maximum errors allowed.

The maximum errors allowed in the tests inherent in the model approval shall be those indicated in Annex I. 1.

Annex I.

Article 9. Model approval sign.

All instruments manufactured in accordance with an approved model shall bear the sign of model approval set out in Annex I to Royal Decree 1616/1985 of 11 September.

Article 10. Registration.

Any electronic gauge for tyres manufactured in accordance with an approved model shall bear the inscriptions referred to in Annex I. 3.1.

CHAPTER III

primitive verification

Article 11. Subjects obliged.

Beneficiaries of model approvals are required to present to the primitive verification all instruments manufactured according to them, prior to their placing on the market or putting into service.

Article 12. Testing and execution.

The tests to be carried out for the purpose of the original verification shall be those specified in Annex II, number 2.1. Such tests shall be carried out by the departments or bodies authorised by the competent public authorities or under their control by the officially approved metrological verification laboratories.

Article 13. Maximum errors allowed.

The maximum errors allowed in the primitive verification shall be those indicated in Annex I. 1.1.

Article 14. A primitive check mark.

The instruments that have passed the primitive verification control shall be duly sealed, placing on them the mark set out in Annex II to Royal Decree 1616/1985 of 11 September.

Article 15. Effects.

Once the primitive verification has been exceeded, the instrument shall be declared in conformity for its purpose, by means of a document issued by the corresponding authorized service or body. The primitive verification will have periodic verification effects.

CHAPTER IV

Verification after repair or modification

Article 16. Authorized repairers.

The repair or modification of electronic tyre gauges can only be performed by a person or entity registered in the Metrological Control Register, as established by Royal Decree 1616/1985, of September 11. Registration in that Register shall require compliance with the requirements set out in Annex III to this Order.

Article 17. Performances of the repairers.

The person or entity that has repaired or modified an electronic gauge for tires, once checked for correct operation and that its measurements are within the maximum permissible errors, will place again the seals which it has had to lift to carry out the repair or modification.

Article 18. Bound subjects and applications.

1. After fixing or modifying an electronic gauge for tyres, the holder shall communicate such repair or modification to the competent public administration, with an indication of the purpose of the repair and specification of the components. replaced, where appropriate, and the adjustments and controls made. You must also request verification of the instrument after repair or modification, prior to your new commissioning.

2. The application for verification shall be accompanied by the bulletin set out in Annex IV, duly completed, for the purposes of identifying the instrument and its holder.

Article 19. Testing and execution.

The tests to be performed on the verification after repair or modification shall be as set out in Annex II, number 3.2. Such tests shall be carried out by the authorised departments or bodies of the competent public authorities.

In addition to the above mentioned tests, the instrument shall also exceed the administrative examination referred to in paragraph 3.1 of Annex II.

Article 20. Maximum errors allowed.

The maximum errors allowed in the verification after repair or modification shall be as indicated in Annex I. 1.1.

Article 21. Conformity.

1. After the verification phase after repair or modification, the competent Public Administration shall declare the conformity of the instrument to carry out the measures of its own purpose, by means of the adhesion, in place of the visible a verified instrument or the supporting installation of a verification label to meet the characteristics and requirements set out in Annex V, and the issue of a certificate attesting to the verification carried out.

2. Verification after repair or modification shall take the effects of the periodic verification.

Article 22. Not exceeding the verification.

When an electronic tyre pressure gauge does not exceed verification after repair or modification as a result of deficiencies detected in its operation, it shall be put out of service until it is remedied. such deficiencies, or withdrawn definitively for use in the event that they are not remedied.

CHAPTER V

Periodic Verification

Article 23. Bound subjects and applications.

1. The holders of electronic gauges for service tyres shall be required to apply annually for the periodic verification of their instruments and their use shall be prohibited in the event that this stage of metrological control is not exceeded. The period of validity of such verification shall be one year.

2. The application for periodic verification shall be accompanied by the bulletin set out in Annex IV to this Order, duly completed, for the purposes of identifying the instrument and its holder.

Article 24. Testing and execution.

The tests to be performed on the periodic verification shall be those specified in Annex II, number 3.2. Such tests shall be carried out by the authorised departments or bodies of the competent public authorities.

In addition to the above mentioned tests, the instrument shall also exceed the administrative examination referred to in paragraph 3.1 of Annex II.

Article 25. Maximum errors allowed.

The maximum errors allowed in the periodic verification shall be as set out in Annex I. 1.1.

Article 26. Conformity.

Exceeded the periodic verification phase, the competent Public Administration shall declare the conformity of the instrument to carry out the measurements proper to its purpose, by means of the adhesion, in the visible place of the instrument verified or of the installation which supports it, of a verification label which shall meet the characteristics and requirements set out in Annex V, and the issue of a certificate attesting to the verification carried out, and shall be affixed again the seals that have been necessary to lift to carry out the verification.

Article 27. Not exceeding the verification.

When an electronic tyre pressure gauge does not exceed periodic verification as a result of deficiencies detected in its operation, it shall be put out of service until such deficiencies are remedied; or It is definitely used in the event that they are not remedied.

Transitional disposition. Electronic gauges for service tyres.

Electronic gauges for tyres which are already in service for the entry into force of this Order and whose models comply with the technical rules, standards or procedures referred to in Article 4, may continue being used provided that they have successfully completed the metrological control phase as regulated in Chapter V.

Final disposition. Entry into force.

This Order shall enter into force on the day following that of its publication in the "Official State Gazette".

Madrid, 16 January 1996.

BORRELL FONTELLES

Ilmo. Mr President of the Spanish Metrology Centre.

ANNEX I

Metrological prescriptions, technical characteristics and inscriptions

1. Metrological prescriptions.

1.1 Maximum permissible errors. -Maximum permissible errors, in more or less, mentioned in the following table, are fixed in absolute values, depending on the pressure measured.

Measure pressure (p)/Maximum errors allowed

p < = bar/0.08 bar

4 bar < p < = 10 bar/0.16 bar

10 bar < p/0.25 bar

Maximum permissible errors will be valid at temperatures between 15 ° C and 25 ° C. This field shall be referred to as the 'temperature reference field'.

1.2 Variation due to temperature. -For tests performed at temperatures outside the reference field of 15 ° C to 25 ° C, the maximum permitted errors, previously indicated, will be modified in absolute value, increasing for each degree Celsius the test temperature differs from the value of 20 ° C, in the following amounts:

Measure Pressure (p)/Maximum Variation Allowed

p < = 4 bar/0.004 bar per ° C

4 bar < p < = 10 bar/0.005 bar per ° C

10 bar < p/0.008 bar per ° C

1.3 Reversibility error. The reversibility or hysteresis error should not exceed the absolute value of the maximum error allowed, at a temperature chosen within the temperature reference field. During the test the temperature shall remain stable.

The difference between the indicated value for a same pressure reached in decreasing fashion and the indicated value for that same pressure reached in an increasing manner should always be positive.

1.4 Indication at atmospheric pressure. -At atmospheric pressure the indicator should always be zero.

2. Technical characteristics.

2.1 Construction. In order to guarantee the permanence of its metrological qualities, the instruments must be constructed in a solid and careful way.

2.2 Indicator device. The pressure indicator device may be an electronic type display or any other device that allows for direct and accurate reading of the measured pressure, with the following: features:

You will be a bar graduate and the value of the step will be set at 0.01 bar.

The height of the figures for the indicator device must be at least 6 millimetres, or, failing that, they shall be of a size allowing for easy reading at a minimum distance of 0,6 metres directly, without an optical system of increase in reading.

In the inflation or deflating regime, the display of pressure will not be apparent.

The data collection frequency will be greater than 2 Hz.

The instrument will allow control of the good functioning of the indicator device.

The instrument must emit a low electrical power signal and prevent the measurement in such a case.

The instrument will allow zero control or will incorporate a manual or automatic zeroing.

When the measured pressure is greater than or equal to the maximum pressure of the nominal range of the scale, a status signal shall be displayed on the indicator device and shall prevent the measurement in that case.

The instrument, before each measurement, must perform a self-check, in order to verify the proper functioning of its components, such as:

Function of digital segments.

Battery status.

Ready for measure indicator signal.

2.3 Timer.-The manometers provided in the manufacture of a device limiting the operating time must have a mechanism which enables the cancellation of this function during the tests, to the object of allow the complete realization of these.

3. Registration.

3.1 Mandatory subscriptions. -Manometers must bear the following entries:

The symbol of measure magnitude: P.

The symbol of the unit measure: Bar.

The power voltage.

If necessary, a symbol indicating the working position of the instrument.

The manufacturer's identification.

The identification of the instrument.

The model approval sign.

Such inscriptions must be directly visible, easily legible and indelible under the normal conditions of use of the instruments, without affecting the reading of the indications.

3.2 Optional subscriptions.-The manometers may also carry inscriptions authorized by the competent Public Administration, provided that such inscriptions do not hinder the reading of the indications provided by the instrument.

ANNEX II

Model approval procedure and electronic gauge verification for tires

1. Model approval.

The approval of the model of electronic tyre gauges must be carried out in accordance with the provisions of Royal Decree 1616/1985 of 11 September establishing the Metrological Control which carries out the State administration.

The minimum number of manometers under examination for the purpose of model approval shall be two. According to the development of the tests, the competent public administration may require the applicant to provide additional manometers.

The test to carry out the model approval shall include the tests specified below. These tests shall be carried out using reference manometers, the errors of which may not exceed the fourth part of the maximum permissible errors for controlled manometers.

1.1 Determination of the error of the instrument. The control of the indications of the manometers shall be carried out at least five points evenly spread over the scale, including a point close to the limit. above and a point near the lower limit of the measurement field.

1.2 Determination of reversibility error. -This test will only be performed on instruments that, in normal use, allow to measure the decreasing pressures. The test shall consist of obtaining the indications of the manometers at least five points, evenly spread over the scale, for increasing and decreasing pressure values, including a point close to the upper limit and a point near the lower limit of the measurement field. The indication for decreasing values shall be obtained after the manometer has been kept for 20 minutes at a pressure equal to the value of the upper limit of the measuring field.

1.3 Test of the stability of the qualities of the manometers. -This test will consist of the following tests:

1.3.1 Aging Trials:

a) A pressure equal to 125 per 100 of the upper limit of the scale, for fifteen minutes.

b) 1,000 pulses given by a pressure ranging from zero to 90/95 per 100 from the upper limit of the measurement field.

c) 10,000 cycles of a slowly varying pressure and from about 20 per 100, to about 75 per 100 of the upper limit of the measurement field, with a frequency not exceeding 60 cycles per minute.

After the described ageing tests, the electronic gauges, after an hour of rest, shall comply with the metrological requirements set out in Annex I. 1, 1.3 and 1.4.

1.3.2 Climate Trials:

a) Room temperature of -20 ° C for six hours and room temperature of +50 ° C for six hours.

b) Environment temperature of 30 ° C and relative humidity of 85 per 100 for two days.

Once these weather tests have been carried out, the electronic gauges must remain at a temperature within the "temperature reference field" for six hours. At the end of the rest period, the manometers shall comply with the metrological requirements set out in numbers 1.1, 1.3 and 1.4 of Annex I.

1.3.3 Mechanical tests:

(a) Vibrations between 10 and 150 Hz, with an acceleration of 2 m/s, at sweep speed of 1 octava/minute for 20 cycles per axle, the instrument being placed on its packaging.

b) 10 series of shocks caused by the free fall of the apparatus from a height of 0.80 meters on a hard floor (concrete). Each series is composed of a shock according to each of the three main axes of inertia (three shocks per series).

c) 10 shocks caused by the free fall of the apparatus from a height of 0.30 meters on a hard floor (concrete), the apparatus being found at the beginning of the fall in a normal position of use.

After the mechanical tests referred to above, the electronic gauges shall comply with the metrological requirements of numbers 1.1, 1.3 and 1.4 of Annex I.

1.3.4 Electrical tests:

a) Variations of the power voltage. This test consists of:

Apply a pressure on the instrument that is between 1/2 of the maximum pressure and the maximum pressure.

Submit the instrument to voltage variations of V + 10 per 100 and V-15 per 100, where V is the value specified by the manufacturer. If the instrument has a operating voltage margin (Vmin, Vmax), then the test will be performed on Vmax +10 per 100 and Vmin -15 per 100.

The indication must remain within the maximum permitted margin of error referred to in Annex I. 1.1. Otherwise, the instrument must detect and react to the failure.

b) Microcuts in the power supply voltage. The test consists of:

Apply a pressure on the instrument that is between 1/2 of the maximum pressure and the maximum pressure.

Reduce to zero the amplitude of the pressure gauge of the gauge for 100 meters, using an appropriate generator.

Power reductions must be repeated ten times with at least 10 seconds intervals.

The indication must remain within the maximum permissible error margin indicated in Annex I. 1.1. Otherwise, the instrument must detect and react to the failure.

c) Rafagas. The test shall consist of:

Apply a pressure on the instrument that is between 1/2 of the maximum pressure and the maximum pressure.

Expose the manometer to bursts of voltage peaks, having a waveform of a double exponential. Each peak must have a rise time of 5 ns and a duration to a means of the amplitude of 50 ns. The width of the gusts will be 15 ms, with an interval between gusts of 300 ms. The test generator must have an output impedance of 50 X and must be adjusted before the pressure gauge is connected. At least 10 positive burst sequences and 10 negative burst sequences should be applied.

The pulse repetition rate and the output voltage peak values for 50 X loads are:

5.0 kHz ± 20 per 100 to 0.125 kV

5.0 kHz ± 20 per 100 to 0.25 kV

5.0 kHz ± 20 per 100 to 0.5 kV

5.0 kHz ± 20 per 100 to 1.0 kV

2.5 kHz ± 20 per 100 to 2.0 kV

The indication must remain within the maximum permissible error margin indicated in Annex I. 1.1. Otherwise, the instrument must detect and react to the failure.

d) Electrostatic charges. The test consists of:

Apply a pressure on the instrument that is between 1/2 of the maximum pressure and the maximum pressure.

Expose the gauge to electrostatic discharges produced by a 150 pF capacitor, which will be charged with a continuous voltage source, connecting one terminal to the ground (manometer chassis), and the other via a 330 X resistance to surfaces that are normally accessible to the operator. At least 10 direct downloads and 10 indirect downloads should be applied. The time interval between successive discharges shall be 10 seconds. Direct discharges will be a continuous voltage of up to 6 kV and indirect or through air discharges of up to 8 kV.

The indication after the disturbance must remain within the maximum permissible error margin indicated in Annex I. 1.1. Otherwise, the instrument must detect and react to the failure.

e) Immunity to radiations of electromagnetic fields. The test shall consist of:

Apply a pressure on the instrument that is between 1/2 of the maximum pressure and the maximum pressure.

Expose the gauge to an electromagnetic field of the following characteristics:

Frequency field: 26 MHz-1,000 MHz.

Field Strength: 1 V/m.

Modulation: 80 per 100 AM, 1 KHz sine wave.

The indication after the disturbance must remain within the maximum permissible error margin indicated in Annex I. 1.1. Otherwise, the instrument must detect and react to the failure.

1.4 Variation due to temperature.-The test will consist of finding, for the same points in which the error of the instrument was determined, the variation of the indication with respect to the above mentioned points for the temperatures of -10 C and +40 C. During this test the manometers shall comply with the requirements set out in Annex I. 1.2.

2. Early verification. The primitive verification of electronic tyre gauges shall consist of checking the conformity of the gauge with the approved model. This phase of the metrological control must be carried out in accordance with the provisions of Royal Decree 1616/1985 of 11 September, establishing the metrological control carried out by the State Administration.

2.1 Tests.-Before carrying out the tests, a reference manometer must be provided, which shall be properly calibrated prior to use in the verification, and the errors of which may not exceed the fourth Part of the maximum permissible errors indicated in Annex I. 1.1.

In the case where the reference manometer is electronic, it shall be lit and shall be lit for at least 15 minutes before any measurement is made to ensure its thermal stability.

The trials to be performed will be as follows:

2.1.1 Determination of the error of the instrument. The control of the indications of the manometers shall be carried out in three points, at least, evenly distributed along the measurement field.

2.1.2 Determination of the reversibility error. The reversibility error should only be determined in the pressure gauges to measure increasing and decreasing pressures. This determination shall be made in accordance with the requirements of Annex I. 1.3. To this effect, the test shall consist of obtaining the indications of the manometers by at least three points evenly spread over the field of measure, for increasing and decreasing pressure values. The test shall be carried out under normal conditions of use.

3. Verification after repair or modification and periodic verification.-The verification after repair or modification as well as the periodic verification of the electronic gauges for tyres shall be carried out in accordance with the (a) the Order.

3.1 Administrative examination. The administrative examination shall consist of the complete identification of the instrument and the verification that it meets the requirements required to be legally in service. It shall be carried out on the basis of the information provided by the applicant in the identification bulletin set out in Annex IV. It shall be verified, in particular, that the instrument has the approval of the model, as well as the inscriptions referred to in Annex I. No 3. It shall also be accredited that it has exceeded the original verification.

3.2 Tests.-Before carrying out the tests, a reference manometer must be provided, which shall be properly calibrated prior to use in the verification, and the errors of which may not exceed the fourth Part of the maximum permissible errors indicated in Annex I. 1.1.

In the case where the reference manometer is electronic, it shall be lit and shall be lit for at least 15 minutes before any measurement is made to ensure its thermal stability.

The tests to be carried out for the purpose of completing the verification after repair or modification, such as periodic verification, shall be as follows:

3.2.1 Operating test. The electronic tyre pressure gauge shall be lit and shall be lit for at least 15 minutes before any measurement is made in order to ensure its thermal stability.

The electronic tyre pressure gauge must be pressurised to the upper limit of the scale, maintaining the pressure at the same value for one minute and then depressurising it in order to adjust all of its elements.

During this test the maintenance of the reading will be checked.

3.2.2 Pressure measurement test.-The control of the indication of electronic tyre gauges shall be carried out at least five points evenly spread over the scale, including a point close to the upper limit and a point near the lower limit of the measurement field.

The value of the electronic gauge of the electronic gauge for tyres shall be determined for each test point, with the difference between the indications of the tyre and the standard gauge for the same value of the pressure.

For electronic gauges for tyres which, in normal use, allow the measurement of decreasing pressures, the value of the reversibility or hysteresis error, defined in agreement, shall also be found for each test point. as specified in Annex I. 1.3.

Obtaining the indications for decreasing values shall be carried out after the manometer has been maintained for at least five minutes at a pressure equal to the value of the upper limit of the measuring field.

After the test and after five minutes at rest, the indicator device must indicate the zero value, in accordance with the provisions of Annex I. 1.4.

ANNEX III

Requirements for enrollment in the Metrological Control Registry of persons or entities that

intend to repair electronic manometers for

tires

Persons or entities who intend to repair or modify electronic gauges for tires referred to in this Order must previously register as authorized repairers in the Control Registry. Metrological, according to the provisions of article 8. of Law 3/1985, of March 18, of Metrology, and in article 2. of Royal Decree 1618/1985, of 11 September, for which the Register of Metrological Control is established.

Enrollment in the Metrological Control Registry will require, on the part of the applicant, compliance with the administrative and technical requirements specified below:

1. Administrative requirements.-Persons or entities applying for registration in the Metrological Control Register as authorised repairers of electronic tyre gauges shall comply with the administrative requirements required by the Royal Decree 1618/1985 of 11 September 1985 establishing the Register of Metrological Control.

2. Technical requirements.-In addition to compliance with these administrative requirements it will also be essential for the registration that the repairer has not only the necessary technical and human resources to be able to carry out his work, but also of the following technical means that allow you to make the contrast of the instrument once repaired and ensure the goodness of the repair:

A pressure source equipped with a system that allows continuous variation of the same between atmospheric pressure and at least 1.5 MPa, both in increasing and decreasing sense.

A properly calibrated reference manometer, the error of which is less than or equal to a quarter of the maximum permitted for electronic tyre gauges.

The necessary means to make the connection to the pressure source of both menometers-the reference and the electronic for tires-in order to be able to make the contrast of their measurements.

ANNEX IV

Electronic gauge identification bulletin for tires

Name of the holder

Address

Telephone location ...........................

Manufacturer of the instrument

Model Brand

Serial Number .................... Measure field

Scale Division Unit of Measure

Site placement of the instrument

Telephone location ...........................

Installation Date

Date Model Approval ...............................

Date of the primitive verification ................................

E/F/M/A/M/J/J/A/S/O/N/D

1996/1997/1998/1999/2000

Annual verification carried out in accordance with the Order of 16 January 1996.

Tester body

Identification Number

Label/Verification Result

Compliant and valid until

E/F/M/A/M/J/J/A/S/O/N/D

1997/1998/1999/2000/2001

The letters and series of digits that appear at the top of the box indicate the months and years,

, respectively, those corresponding to the month and the year in which the verification has been carried out must be drilled.

The letters and series of digits at the bottom right of the box also indicate months and years, and those in which the validity of the verification has expired must be drilled.

The label must include the identification number and the stamp of the body that has carried out the verification.

The manometer shall be sealed once the verification after repair or modification has been completed as well as the periodic verification, in order to prevent any possibility of modifying the characteristics metrology of the instrument.