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BS EN 12645:2014

BS EN 12645:2014

$167.15

Tyre pressure measuring instruments. Devices for inspection of pressure and/or inflation / deflation of tyres for motor vehicles. Metrology, requirements and testing

Published By Publication Date Number of Pages
BSI 2014 40
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This European Standard defines metrological and technical requirements and tests of tyre pressure measuring instruments.

Tyre pressure measuring instruments (often referred to as Tyre Pressure Gauges, [TPG]) are for the inspection of pressure and/or inspection of inflation/deflation of tyres of motor vehicles.

It establishes in the context of motor vehicles tyres, the minimum characteristics of the chain of measurement of tyre pressure measuring instruments intended to inspect or adjust the pressure of tyres inflated by air or nitrogen.

These devices, classified in different categories, are hereinafter referred to by generic term, “tyre pressure measuring instruments”.

This chain of measurement consists of all the elements between the tyre valve and the display device (connector, hose, control device, measurement components, reservoir, preset device etc.).

They indicate the pressure difference ( p e) between the air or the nitrogen in the tyre and the atmosphere.

The field of application established above can be extended to other applications where no specific standard exists.

Because of the influence of tyre pressure on road safety and energy efficiency, periodical verification of tyre pressure measuring instruments is strongly recommended.

PDF Catalog

PDF Pages PDF Title
6 Foreword
7 1 Scope
2 Normative references
8 3 Terms and definitions
10 4 Categories
12 5 Metrological requirements
5.1 Maximum permissible errors
5.2 Hysteresis error
5.3 Zero
5.3.1 Return of the instrument’s indication to zero
5.3.2 Zero setting
13 5.4 Units
6 Technical requirements
6.1 Construction
6.2 Analog indicating tyre pressure measuring instrument
6.2.1 Scale angle
6.2.2 Scale interval
6.2.3 Scale spacing
14 6.2.4 Index
6.3 Digital indicating tyre pressure measuring instrument
6.3.1 Scale interval
6.3.2 Readability
6.4 Additional constructional requirements
6.4.1 Mechanical tyre pressure measuring instruments
6.4.2 Electronic tyre pressure measuring instrument
15 6.4.3 Electronic and mechanical tyre pressure measuring instruments
6.4.4 Preset device
6.5 Operating conditions
6.5.1 Climatic requirements
6.5.1.1 Rated temperature in service
16 6.5.1.2 Rated storage temperatures
6.5.1.3 Humidity
6.5.1.4 Corrosion requirements
6.5.2 Mechanical requirements
6.5.2.1 Protection against ingress of water and foreign particles (degree of protection)
6.5.2.2 Durability of the measuring instrument
6.5.2.3 Vibration
6.5.2.4 Free fall
17 6.5.3 Electromagnetic immunity requirements for electronic tyre pressure measuring instruments (with digital display and/or electronic sensor)
6.5.3.1 Essential requirements
18 6.5.3.2 Technical requirements
6.5.3.3 Acceptance criteria
6.5.4 Software requirements for electronic tyre pressure measuring instruments
19 6.5.5 Mounting position requirements
6.5.6 Kind of pressure indication requirement
7 Type approval testing to check for compliance with metrological and technical requirements
7.1 General
20 7.2 Determination of accuracy error
7.3 Determination of hysteresis error
7.4 Determination of return of instrument’s indication to zero
7.5 Determination of error after/during a disturbance or influence
7.6 Climatic tests
7.6.1 Determination of the MPE in the rated temperature in service
21 7.6.2 Rated storage temperature
7.6.3 Humidity
7.6.4 Corrosion test
7.7 Mechanical tests
7.7.1 Protection against ingress of water and foreign particles (degree of protection)
22 7.7.2 Examination of the durability of the measuring instrument
7.7.3 Vibration (random)
23 7.7.4 Free fall
7.8 Electromagnetic immunity
7.8.1 AC mains voltage variations
7.8.2 DC mains voltage variations
7.8.3 AC mains power
7.8.4 Bursts on AC and DC mains
7.8.5 Electrostatic discharges
24 7.8.6 Fast transients on signal and I/O lines
7.8.7 Surges on signal and I/O lines
7.8.8 DC mains power
7.8.9 Ripple on DC input power ports
7.8.10 Surges on AC and DC mains lines
7.8.11 Radiated radio-frequency electromagnetic fields
7.8.12 Conducted radio-frequency fields
7.8.13 Voltage variations (if powered by vehicle battery)
25 7.8.14 Electrical transient conduction along supply lines (if powered by vehicle battery)
7.8.15 Load dump (if powered by vehicle battery)
26 The pulse shape and parameters for an alternator with centralised load dump suppression are given in Figure 4 and Table 5 below.
27 7.9 Software examination
28 7.10 Mounting position
7.11 Determination of pressure sensor — kind of pressure test
8 Inscriptions and marking
8.1 Inscriptions
8.1.1 Obligatory inscriptions
29 8.1.2 Optional inscriptions
8.2 Verification marks and sealing
9 Metrological control
9.1 Type approval
9.2 Initial Verification
9.3 Subsequent verification
30 9.4 In-service control
31 Annex A (normative) Correspondence between requirements and tests
32 Annex B (normative) MPE graphics
34 Annex C (informative) Examples of type approval test sequence for multiple samples
37 Annex D (informative) Recommended solutions for special test conditions
38 Bibliography

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BS EN 12645:2014
$167.15