337/2000 Sb.
DECREE
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.
Minister:
doc. Ing. Gregr, r.
XIII.
The requirements on tyre pressure gauges for road vehicles
1.
THE SCOPE OF THE
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.
METROLOGICAL REQUIREMENTS
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
pressure:
+--------------------------------------+------------------------+
| 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
table:
+--------------------------------------+------------------------+
| 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.
TECHNICAL REQUIREMENTS
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.
INSCRIPTIONS AND MARKS
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
itself:
-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
validation.
Must be pressure gauges to prevent
change the properties of the device.
5.
EEC TYPE-APPROVAL
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
pressure.
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.
6.
THE INITIAL EEC VERIFICATION
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
type.
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
EEC.
3) section 14 of Act No. 506/1990 Coll., on weights and measures, as amended by Act No.
119/2000 Sb.
