Decree of the Ministry of Industry and Trade No. 337 / 2000 Coll.
Decree of the Ministry of Industry and Trade laying down requirements for meters marked with EEC mark used for measuring air pressure in road vehicle tyres
Valid
Order
Effective from 21.04.2004
337
DECLARATION
Ministry of Industry and Trade
of 6 September 2000
laying down requirements for meters marked with the EEC mark used for measuring air pressure in road vehicle tyres
The Ministry of Industry and Trade provides, pursuant to Section 27 of Act No. 505 / 1990 Coll., on Metrology, as amended by Act No. 119 / 2000 Coll., ("the Act ') for the implementation of Sections 6 (2) and 9 (1) of the Act:
This Decree lays down requirements for air pressure gauges in road vehicle tyres as defined in point 1 of the Annex to this Decree.
The air pressure gauges in road vehicle tyres may be marked with the EEC type-approval mark and the initial EEC verification mark, the graphic form of which is provided for in the specific legislation, (2) only if they comply with the requirements set out in the Annex to this Regulation and the fulfilment of which has been verified by the procedures laid down in the specific legislation.2).
This Regulation shall enter into force on the day of the publication of the sectoral annex to the Protocol to the Europe Agreement establishing an association between the Czech Republic, of the one part, and the European Communities and their Member States, of the other part, on conformity assessment and acceptance of industrial products in the Collection of International Treaties, or on the date of the entry into force of the Treaty of Accession of the Czech Republic to the European Union, if that date is earlier.
Minister:
Doc.
Annex to Decree No 337 / 2000 Coll.
Requirements for air pressure gauges in road vehicle tyres
1. SCOPE
In this Annex, the words "tyre pressure gauges for road vehicles' means devices without pre-selection devices fitted with fixed or mobile tyre-inflation devices for road vehicles and in which the elastic deformation of the sensor is mechanically transmitted to the indicator devices and which show the pressure difference (Pe) between air in the tyre and atmosphere.
They also include all the parts between the tyre and the sensor.
2. METHOLOGICAL REQUIREMENTS
2.1 Maximum permissible errors
The maximum permitted positive or negative errors given in the table below are defined as absolute values with respect to the measured pressure:
| Měřený tlak | Maximální dovolená chyba |
|---|---|
| nepřesahující 400 kPa (4 bar) | 8 kPa (0,08 bar) |
| nad 400 kPa (4 bar), ale nepřesahující 1000 kPa (10 bar) | 16 kPa (0,16 bar) |
| nad 1000 kPa (10 bar) | 25 kPa (0,25 bar) |
The maximum permissible errors shall not be exceeded within the temperature range from 15 ° C to 25 ° C. This range is hereinafter referred to as the "reference temperature range '.
2.2. Temperature errors
Errors when reading from pressure gauges at temperatures outside the reference range but between -10 ° C and + 40 ° C are given in the following table:
| Měřený tlak | Maximální dovolená chyba |
|---|---|
| nepřesahující 400 kPa (4 bar) | 0,1 % ze 400 kPa (4 bar) na °C |
| nad 400 kPa (4 bar), ale nepřesahující 1000 kPa (10 bar) | 0,05 % z 1000 kPa (10 bar) na °C |
| nad 1000 kPa (10 bar) | 0,05 % z horní hranice stupnice na °C |
2.3 Error with increasing and decreasing pressure
For pressure gauges the error shall not exceed the absolute value of the maximum permissible error at any temperature within the reference temperature range. This temperature shall remain constant during the test.
For a given pressure, the value measured for increasing pressure shall not exceed the value measured for decreasing pressure.
2.4 Back movement of the instrument indicator to a pre-defined mark
At atmospheric pressure, the pressure gauge shall be stopped against a zero mark or against a pre-determined mark, clearly different from the scale sections, within the limits of the maximum permissible error. The pressure gauge shall have a stop distance corresponding to at least twice the maximum permissible error below the zero or pre-determined mark.
3. TECHNICAL REQUIREMENTS
3.1 Construction
The pressure gauges shall have a robust and careful design to ensure that they retain their metrological characteristics.
3.2 Indicator
3.2.1 Indicator devices are equipped with a scale in kPa (bar), the value of which is fixed to 10 kPa (0,1 bar).
3.2.2 The indicator device shall allow for direct and accurate reading of the measured pressure value within the measured range. For this purpose, the width of the part of the marker which overlaps the scale marks shall not be greater than the width of the scale marks themselves. The indicator shall overlap approximately half the length of the shortest scale marker. The maximum distance between the marker and the scale plane shall in no case exceed 2 mm or 0,02L + 1mm in the case of indicator devices with a circular dial (L being the distance between the axis of rotation of the marker and its end).
3.2.3 The scale shall have a constant division throughout the whole range. The lengths of the pieces which shall not be less than 1,25 mm shall be the same or show only minor deviations. Changes in the length of the pieces shall be permitted if the difference between the two subsequent lengths of the sections does not exceed 20% of the maximum value and if the difference between the smallest and the largest length of the piece does not exceed 50% of the maximum value.
Each fifth mark shall be distinguished from the others by its greater length; each fifth or tenth mark shall be numbered. The width of the marks shall be almost constant and shall not exceed one fifth (1 / 5) of the length of the piece.
4. SIGNS AND SIGNS
4.1. Entries
4.1.1. Compulsory inscriptions
The pressure gauges shall have the following inscriptions:
(a) on the code list:
- the measured value mark,
- a mark for the unit of measurement kPa (bar),
- if necessary, a mark indicating the working position of the apparatus;
(b) on the code list, on the label bearing the nominal data or on the apparatus itself:
- details of the manufacturer's identity,
- instrument identification data,
- the EEC type-approval mark.
These inscriptions shall be directly visible, easily legible and indelible under normal working conditions and shall not impede the reading of the instrument's data.
4.1.2. Optional inscriptions
Pressure gauges may also have additional inscriptions authorised by the competent authority provided that they do not prevent the reading of the instrument's data.
4.2 Verification and sealing marks
An appropriate place for placing EEC initial verification marks shall be provided.
The protection of the pressure meter shall be possible in such a way as to prevent any change in the characteristics of the apparatus.
5 EEC TYPE-APPROVAL
The EEC type-approval of pressure gauges shall be carried out in accordance with a separate regulatory provision (2).
When applying for type approval, at least two pressure gauges shall be submitted for examination. The Czech Metrology Institut3) may request additional pressure gauges to be supplied, depending on the test procedure.
5.1 Verification of compliance with technical and metrological requirements
The pressure gauges submitted for EEC type-approval shall be subjected to an examination to ensure that they comply with the technical requirements set out in points 2, 3 and 4.
The test shall consist of tests listed below which are carried out using reference pressure gauges, the errors of which shall not exceed one quarter (1 / 4) of the maximum permissible errors for the pressure gauges tested.
5.1.1. Determination of instrument error
The pressure gauges shall be checked at least five points (including points close to the lower and upper limits of the range) regularly distributed throughout the scale.
5.1.2. Determination of hysteresis error
This test shall be carried out only on those instruments which are normally used to measure decreasing pressures.
The test shall consist of a reading at least five points of the pressure gauge (including points close to the lower and upper limits of the measurement range) distributed regularly throughout the scale, with rising and decreasing pressure values.
In the case of decreasing values, the reading shall be performed only after the pressure gauge has been maintained for 20 minutes at a pressure equal to the upper between the measuring range.
5.1.3. Test of stability of the characteristics of pressure gauges
The tests shall consist of:
(a) a pressure exceeding 25% of the upper limit of the measuring range for 15 minutes;
(b) 1000 pulses generated by pressure varying from 0 to 90 to 95% of the upper limit of the measurement range;
(c) 1000 slow pressure cycles fluctuating from approximately 20% to approximately 75% of the upper limit of the measurement range at a frequency not exceeding 60 cycles per minute;
(d) ambient temperature - 20 ° C for six hours and + 50 ° C for six hours.
After the tests referred to in points (a) to (c) have been carried out, the pressure gauges shall be kept at rest for one hour and shall then comply with the conditions set out in points 2.1, 2.3 and 2.4.
After the temperature test referred to in point (d), the pressure gauges shall be kept at rest at any temperature in the reference temperature range for six hours. After this period, the pressure gauges shall comply with the requirements set out in points 2.1, 2.3 and 2.4.
5.1.4. Temperature variation
The test consists of determining the change in reading value for the given pressure at -10 ° C and + 40 ° C relative to reading at reference temperature range.
6. FIRST EEC VERIFICATION
The initial EEC verification of pressure gauges shall be carried out in accordance with a specific regulatory regulation.3)
6.1. Conformity examination
This test shall consist of checking the conformity of the pressure gauge with the approved type.
6.2 Verification tests
These tests shall be carried out using reference pressure gauges, the errors of which shall not exceed one quarter (1 / 4) of the maximum permissible errors for pressure gauges submitted for verification.
6.2.1 Identification of errors
The indication of the pressure gauge shall be checked on at least three points regularly throughout the measurement range.
6.2.2 Determination of an error in increasing or reducing pressure
The failure to increase or reduce the pressure shall only be tested in the case of pressure gauges which may measure the rising and decreasing pressure referred to in paragraph 2.3. The relevant test shall consist of the execution of a reading at least three points on the pressure gauge regularly distributed over the whole measuring range for increasing and decreasing pressure values. The test shall be carried out under normal conditions of use of the gauge.
1) Decree No. 262 / 2000 Coll., which ensures uniformity and correctness of meters and measurements.
2) Decree No. 332 / 2000 Coll., laying down certain procedures for the approval and verification of certain EEC-marked measuring instruments.
3) Article 14 of Act No. 505 / 1990 Coll., on Metrology, as amended by Act No. 119 / 2000 Coll.
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Regulation Information
| Citation | Decree of the Ministry of Industry and Trade No. 337 / 2000 Coll., laying down requirements for meters marked with EEC mark used for measuring air pressure in road vehicle tyres |
|---|---|
| Regulation Type | Order |
| Author | - |
| Collection | Code of Laws |
| Date of Promulgation | 26.09.2000 |
|---|---|
| Effective from | 21.04.2004 |
| Effective until | - |
| Status | Valid |
The regulation text is for informational purposes only.
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