Laying Down The Requirements On The Gauge With The Eec Mark Referred To

Original Language Title: , kterou se stanoví požadavky na měřidla označovaná značkou EHS

Read the untranslated law here:

Subscribe to a Global-Regulation Premium Membership Today!

Key Benefits:

Subscribe Now for only USD$20 per month, or Get a Day Pass for only USD$4.99.
337/2000 Sb.


The Ministry of industry and trade

of 6 May 1999. September 2000,

laying down the requirements on the gauge with the EEC mark referred to in use

to measure the air pressure in the tyres of road vehicles

Change: 260/2003 Coll.

The Ministry of industry and trade shall determine in accordance with section 27 of Act No. 506/1990

Coll. on metrology, as amended by Act No. 121/2000 Coll. (hereinafter the "Act")

for the implementation of § 6 (1). 2 and § 9 para. 1 of the Act:

§ 1

This Decree lays down the requirements on tyre pressure gauges

road vehicles as defined in point 1 of the annex to this Decree.

§ 2

Tyre pressure gauges for road vehicles can be

instead of marking the official markers laid down by specific legal

Regulation ^ 1) marked with the mark of EEC pattern approval and EEC initial

verification, whose graphic design provides for a separate legal regulation, ^ 2)

only if they meet the requirements set out in the appendix to this Decree and whose

meet the verify procedures laid down by specific legal

^ 2) of the regulation.

§ 3

This Decree shall take effect on the date of publication of the sectoral annex for

the measuring instrument to the Protocol to the Europe Agreement establishing an association between the

The Czech Republic on the one hand, 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 entry

the Treaty of accession of the Czech Republic to the European Union entered into force,

If the day earlier.


doc. Ing. Gregr, r.


The requirements on tyre pressure gauges for road vehicles



In this annex, the words "tyre pressure gauge road

vehicles "means the product without pre-setting mechanisms, which are

equipped with fixed or movable device to tire pressures road

vehicles and in which the elastic deformation of the sensors is transmitted mechanically

the indicating device and that show the difference pressure (Pe) between the air in

the tyre and the atmosphere.

They also include all the parts between the tyre and the sensor.



2.1. Maximum permissible errors

The maximum permissible positive or negative errors given in the below

table are defined as absolute values relative to the measured



| Measured pressure | The maximum permissible error |


not exceeding 400 kPa | (4 bar) | 8 kPa (0.08 bar) |


over 400 kPa | (4 bar) but not exceeding | 16 kPa (0.16 bar) |

| 1000 kPa (10 bar) | |


over 1000 kPa | (10 bar) | 25 kPa (0.25 bar) |


The maximum permissible errors must not be exceeded in the temperature range from 15

C to 25 degrees C this range is also called the "temperature reference

range ".

2.2 Errors due to temperature

Errors when reading from the gauge pressure at temperatures that lie outside the

the reference range but between-10 ° C and + 40 ° C, gives the following



| Measured pressure | The maximum permissible error |


not exceeding 400 | kPa (4 bar) | 0.1% of 400 kPa (4 bar) |

| C | on |


over 400 kPa | (4 bar) but not exceeding | 0.05% of 1000 kPa |

| 1000 kPa (10 bar) 10 bar) on C |


over 1000 kPa | (10 bar) 0.05% of the upper limit |

| the scale on the St. | C |


2.3 error when growing and declining pressure

Error when growing and declining pressure must not exceed the pressure gauges

the absolute value of the maximum permissible error, at any temperature

within the temperature reference range. This temperature must in the course

tests remain constant.

For a given pressure value measured must not for increasing pressure exceed the

the value measured for decreasing pressure.

2.4 the retrograde motion for resetting the unit to a predetermined mark

At atmospheric pressure gauge pressure indicator must stop against the

the zero mark or opposite a predetermined mark clearly different from

the scale intervals, within the limits of the maximum permissible error. Pressure gauge may only be

have a breakpoint at a distance corresponding to at least twice the maximum

permissible error below zero or a predetermined brand.



3.1 Construction

Pressure gauges must have robust and careful to ensure that the

keep its metrological properties.

3.2 the indicating device

3.2.1 indicating devices are graduated in kPa (bar), and

the value of the scale interval is fixed at 10 kPa (0.1 bar).

3.2.2 the indicating device must make it possible to direct in the measured range and

an accurate reading of the values of the measured pressure. For this purpose, it must not be the width of the

part of the bar that overlaps the scale marks, greater than the width

scale marks themselves. Marker must overlap by approximately half of the

the length of the shortest scale marks. The maximum distance between the index

and the plane of the scale must in no case exceed 2 mm or 0.02 L +

1 mm, in the case of circular-dial indicating devices (with L

the distance between the axis of the rotation of the pointer and its extremity).

3.2.3 the scale must be constant throughout the Division. The length of intervals

which may not be less than 1.25 mm, must be the same or only

small variations. Changes in the length of tick marks are acceptable if the difference between

the following two lengths of intervals shall not exceed 20% of the maximum value, and

If the difference between the minimum and maximum length of intervals does not exceed 50% of the

the maximum values.

Every fifth mark must be distinguished from the others by its greater length;

every fifth or tenth mark must be numbered. The thickness must be

the almost constant and must not exceed one-fifth (1/5) the length of the interval.



4.1 Inscriptions

4.1.1. Mandatory signs

Pressure gauges must have the following inscriptions:

and) on the dial:

-the measured, mark

-tag for the unit of measurement for kPa (bar)

-If necessary, a sign indicating the working position of the instrument;

(b)), on the label on the dial plate or on the device


-details about the identity of the manufacturer,

-identification of the device,

-EEC type-approval mark.

These inscriptions must be under normal working conditions directly visible,

legible and indelible and shall not impede reading of the instrument indication.

4.1.2 Optional inscriptions

Pressure gauges may also have additional inscriptions authorized by the competent

authority, provided that it does not prevent the reading of the instrument indication.

4.2 Verification and sealing marks

Must be provided, a suitable place for the placement of the initial EEC


Must be pressure gauges to prevent

change the properties of the device.



EEC type-approval for pressure gauges must be carried out under the Special

Law ^ 2).

When applying for a type-approval shall be submitted for examination

at least two pressure gauges. Czech metrology institute ^ 3) may request

in order to additionally supplied additional pressure meters, depending on the procedure

of the tests.

5.1 Verification of compliance with technical and metrological requirements

Pressure gauges submitted for EEC type-approval shall be subject to

examination to ensure that they comply with the technical requirements of the

laid down in points 2, 3 and 4.

The examination consists of tests mentioned below, which are executed

by means of reference pressure gauges whose errors must not exceed

one-quarter (1/4) of the maximum permissible errors for the test gauge


5.1.1. Determination of errors

Data pressure gauges shall be checked at least five points (including points

close the upper and lower limits of the measuring range) distributed evenly over

the whole scale.

5.1.2 determination of hysteresis error

This test is performed only on instuments which, in

normal use, designed to measure decreasing pressures.

The test consists of reading in at least five points (including pressure meters

a point near the upper and lower limits of the measuring range) distributed

periodically over the scale, at the rising and falling

values of pressure.

In the case of falling values must be performed only after reading what

gauge pressure was maintained for 20 minutes at a pressure that is equal to the

the upper limit of the measuring range.

5.1.3. the examination of the stability of the properties of pressure gauges

The tests consist of the fact that the gauge pressure be subjected to:

a) a pressure exceeding the 25% upper limit of the measuring range for 15 minutes,

(b)) created by a pressure varying 1000 pulses from 0 to 90-95% of the upper

the limits of the measuring range,

c 1000 cycles) pressure slowly from approximately 20% of the variation in approximately

75% of the upper limit of the measuring range at a frequency not exceeding 60 cycles

per minute,

d) ambient temperature-20 ° C for six hours and a temperature of + 50 ° C after

for six hours.

After the test referred to in points (a) to (c))) is the gauge pressure

leave for one hour at rest and then must satisfy the conditions

laid down in paragraphs 2.1, 2.3 and 2.4.

After you perform the test temperature referred to in point (d)) with pressure gauge

keep calm while some temperature of the temperature reference range

After a period of six hours. After this time the gauge pressure must comply with the

the requirements set out in sections 2.1, 2.3 and 2.4.

5.1.4 Variations due to temperature

The test consists in determining the change in reading for a given pressure when

temperature-10 ° C and + 40 ° C relative to reading in the reference

the temperature range.



The initial EEC verification of pressure gauges is carried out under a special

legislation. ^ 3)

6.1 examination of the conformity

This test consists of the examination of the conformity of the pressure gauge with the approved


6.2 verification tests

These tests are performed by means of reference pressure gauges whose

errors must not exceed one-quarter (1/4) of the maximum permissible

errors for the pressure gauges submitted for verification.

6.2.1. Determination of errors

Indication of pressure Gages checked in at least three points spaced

periodically over the measuring range.

6.2.2 Determine errors when you increase or decrease the pressure

Error when you increase or decrease the pressure must be checked only in the

case of pressure gauges which can measure increasing and decreasing pressure

referred to in point 2.3. The relevant test consists of making the deduction of at least

three points on a gauge pressure distributed evenly over the

the measuring range for increasing and decreasing pressure values. The test must

be carried out under normal conditions of use of the meter.

1) Decree No. 262/2000 Coll., which ensures consistency and accuracy

measuring instruments and measurements.

2) Decree No. 332/2000 Coll., laying down some of the procedures in the

type-approval and verification of measuring instruments, called marker set


3) section 14 of Act No. 506/1990 Coll., on weights and measures, as amended by Act No.

119/2000 Sb.