Bsi bs en 15518 3 2011

BSI Standards Publication BS EN 15518 3 2011 Winter maintenance equipment — Road weather information systems Part 3 Requirements on measured values of stationary equipments BS EN 15518 3 2011 BRITISH[.]

BSI Standards Publication

Winter maintenance equipment — Road weather information systems

Part 3: Requirements on measured values of stationary equipments

This British Standard is the UK implementation of EN 15518-3:2011 The UK participation in its preparation was entrusted to Technical Committee B/513, Construction equipment and plant and site safety

A list of organizations represented on this committee can be obtained on request to its secretary

This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application

© BSI 2011 ISBN 978 0 580 65403 9 ICS 07.060; 13.030.40; 35.240.99

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2011

Amendments issued since publication

NORME EUROPÉENNE

ICS 07.060; 13.030.40; 35.240.99

English Version

Winter maintenance equipment - Road weather information

systems - Part 3: Requirements on measured values of

stationary equipments

Matériels de viabilité hivernale - Systèmes d'information

météorologique routière - Partie 3: Exigences relatives aux

valeurs mesurées par des matériels fixes

Winterdienstausrüstung - Straßenzustands- und Wetterinformationssysteme - Teil 3: Anforderungen an gemessene Werte der stationären Anlagen

This European Standard was approved by CEN on 1 January 2011

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member

This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom

EUROPEAN COMMITTEE FOR STANDARDIZATION

C O M I T É E U R O P É E N D E N O R M A L I S A T I O N

E U R O P Ä I S C H E S K O M I T E E FÜ R N O R M U N G

Management Centre: Avenue Marnix 17, B-1000 Brussels

2

Foreword 3

Introduction 4

1 Scope .5

2 Normative references .5

3 Terms and definitions 5

4 Requirements .7

Tables Table 1 — Measurement requirements 8

Foreword

This document (EN 15518-3:2011) has been prepared by Technical Committee CEN/TC 337 “Winter maintenance and road service area maintenance equipment”, the secretariat of which is held by AFNOR This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2011, and conflicting national standards shall be withdrawn at the latest by August 2011

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights

EN 15518, Winter maintenance equipment — Road weather information systems, comprises of the following

parts:

 Part 1: Global definitions and components

 Part 2: Road weather — Recommended observation and forecast

 Part 3: Requirements on measured values of stationary equipments

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom

4

Introduction

Road Weather Information Systems (RWIS) are complex structures used for road maintenance decision support, which feature as a rule the following components: meteorological sensors and instruments, transmission technology, computer systems for processing, representation and storing of information, road weather forecasts and alarms, in relation to traffic control and traffic information systems and more

Stationary equipment performs the acquisition of road and meteorological information at a fixed location This part of EN 15518 lays down the requirements for the recommended components of a stationary equipment of a RWIS In the description of requirements a distinction is made between the components forming a basis stationary equipment for winter use and the recommended complementary components The aim is to ensure extensive combination and interchangeability within the systems

With a set terminology for the components and the meteorological expressions an attempt is made to counteract a diversity of terms and designations for identical phenomena

1 Scope

This European Standard specifies the terminology and performance requirements for all components of stationary equipment within a Road Weather Information Systems (RWIS)

The following referenced documents are indispensable for the application of this document For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies

EN 15144:2007, Winter maintenance equipment — Terminology — Terms for winter maintenance

3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 15144:2007 and the following apply NOTE The following definitions have been established specifically for the RWIS domain

3.1

surface

3.1.1

pavement surface temperature

effective radiation temperature of a pavement surface

3.1.2

road surface condition

qualification of the status of road surface affected by road weather phenomenon

3.1.3

water film thickness

mean thickness of the film of water present on a flat surface

3.2

aerial

3.2.1

relative humidity

filling rate of the mass of air with water vapour

NOTE It is determined in relation to water, in liquid phase, and recorded under a screen at a height between 1,5 m and 4,0 m from the ground

3.2.2

precipitation

exclusion of falling water from the atmosphere in liquid and/or solid form which can be observed and measured on ground

3.2.3

rain

precipitation in liquid form

6

3.2.4

depth of precipitation

thickness of the layer of water obtained by precipitation or deposit on a horizontal surface if the precipitations falling in solid form were to melt

3.2.5

depth of snow

raw thickness of snow deposited on the ground

3.2.6

intensity of precipitation

depth of precipitations collected per unit of time

3.2.7

wind speed (instantaneous and mean wind)

ratio of the distance travelled by the air, per unit of time

3.2.8

gust of wind

brief, sudden increase in the speed of the wind in relation to its mean value

3.2.9

wind direction (instantaneous and mean wind)

direction from where the wind is blowing with respect to the magnetic north

3.2.10

visibility

distance defined by the meteorological optical range

3.2.11

total radiation

solar radiation received by a horizontal surface from the galactic centre, directed towards the ground, within a spectral range from 0,3 µm to 3 µm

3.2.12

atmospheric radiation

high wavelength infrared radiation emitted by the atmosphere, within a spectral range from 4 µm to 100 µm

3.2.13

total cloud cover

fraction of the galactic centre hidden by all of the visible clouds

NOTE It is defined by the International Meteorological Code 2 700 It is expressed in octa corresponding to the eighth

of the galactic centre occupied by the clouds

3.3

general

3.3.1

screen

shelter built in such a manner that it protects its contents against solar radiation, precipitations and condensation and contributes at the same time to ventilation

3.3.2

sampling interval

time between two readings meant for the elaboration of a value

3.3.3

measurement interval

time between two elaborated values

3.3.4

polling interval

time between two transmissions of elaborated values

4 Requirements

The requirements hereafter apply to sensors in road conditions However, the accuracy requirements are meant for laboratory testing Sensor set-up, calibration and special handling shall be specified by the manufacturer

The first column of Table 1 hereafter states “B” for parameters recommended in a basic configuration, and “O” for parameters considered as optional according to specific applications

a) Thermal resistance

1) sensors embedded in the pavement need to survive surface temperatures from – 40 °C to + 70 °C; 2) equipment placed in the air need to survive air temperatures from – 40 °C to + 60 °C

b) Chemical resistance

All components of the road and weather information system installed on the pavement shall be resistant to the thawing agents and fuels to which roads are normally exposed

c) Mechanical resistance

Sensors and other components embedded in the pavement shall withstand regular mechanical loads exerted

by traffic, including rollovers by snow-clearing machines

d) Electro-magnetic resistance

All components of the road and weather information system shall not be affected by conventional environing electro-magnetic conditions

The equipment defined under this standard shall be considered as “Industrial equipment”

8

Table 1 — Measurement requirements

B Pavement surface

temperature Measuring range: Resolution: 0,1 – 30 °C to + 60 °C °C

Accuracy: – 15 °C to 10 °C, (± 0,2 °C)

– 30 °C to – 15 °C, (± 0,8 °C) and + 10 °C to 60 °C , (± 0,8 °C)

B Road surface condition Dry: no humidity over the sensor

Moist: from (0,01 mm) water film thickness over

the sensor Wet: from (0,2 mm) water film thickness over the

sensor Streaming water: from (2 mm) water film thickness over the

sensor Slippery: detection at least of the presence of partly

or wholly solidified aqueous solution over the sensor

O Water film thickness Measuring range: 0,2 mm to 3 mm

Accuracy: 0,2 mm to 3 mm, (± 30 %) Specific averaging can be required by the customer

Table 1 (continued)

B Freezing point temperature Measured:

Measuring range: – 30 °C to 0 °C

Accuracy: 0 °C to – 15 °C, (± 0,5 °C)

– 15 °C to – 30 °C, (± 1,5 °C) This requirement is independent of the de-icing agent being used These accuracies are obtained under the following conditions:

- Aqueous solution film thickness: 0,05 mm to 0,5 mm;

- Measured from ≤ 4 °C pavement surface temperature

Calculated

Measuring range : – 30 °C to 0 °C Resolution : 0,1 °C

Accuracy : 0 °C to – 2,5 °C, (± 0,5 °C)

– 2,5 °C to – 30 °C, (± 20 %) This requirement depends on the de-icing agent being used These accuracies are obtained under the following conditions:

- Aqueous solution film thickness: 0,05 mm to 0,5 mm;

- Under defined and constant de-icing agent;

- Measured from ≤ 4 °C pavement surface temperature

O Road body temperature Measuring range: between – 25 °C and + 60 °C

Accuracy: ± 1 °C

B Air temperature Measuring range: between – 40 °C and + 60 °C

Accuracy: ± 0,1°C between – 10°C and + 10°C

± 0,5 °C otherwise

B Relative humidity Measuring range: at least between 30 % and 100 %

Accuracy: ± 3 % between 85 % and 100 %

± 5 % otherwise

10

Table 1 (continued)

B Dew-point temperature Measured

Measuring range: between – 10 °C and + 10 °C

Accuracy: ± 0,3 °C

Calculated

Measuring range: between – 10 °C and + 10 °C and

relative humidity > 85 %

Accuracy: ± 1,5 °C

B Precipitation detection time The following precipitation have to be detected in the following time:

2 min: ≥ 1,2 mm/h

6 min: ≥ 0,4 mm/h

10 min: ≥ 0,1 mm/h

B Precipitation type Distinction between solid and liquid precipitation with 80 %

confidence within the above precipitation detection time

O Precipitation intensity Measuring range: between 0,1 mm/h and 200 mm/h

Accuracy: ± 30 % of measured value between 0,1 mm/h

± 20 % of measured value between 0,5 mm/h

± 40 % of measured value above 5 mm/h The accuracy is given for liquid precipitation, when measured in a

10 min period

Solid precipitation shall be expressed in terms of the rainfall equivalent

O Snow depth

(measured at the RWIS site) Measuring range : 0 cm to 50 cm Resolution : 1 cm

Accuracy : ± 2 cm

O Snow depth

(measured on the road

surface)

Measuring range : 0 cm to 50 cm Resolution : 1 cm

Accuracy : ± 2 cm These requirements shall be adapted to the equipment able to perform this type of measurement

This information shall be representative of a given area

Table 1 (continued)

O Wind speed Measuring range: at least between 0 m/s and 35 m/s

Accuracy: ± 1 m/s between 1 m/s and 10 m/s

± 10 % of measured value otherwise Starting value: < 1 m/s

The wind speed shall be specified as an average vector over a sliding time interval of 10 min

O Gust of wind Measuring range : between 0 m/s and 50 m/s

Resolution : 0,1 m/s Accuracy : ± 1 m/s between 1 m/s and 10 m/s

± 10 % of measured value otherwise Starting value: < 1 m/s

The gust of wind is measured over a period of ≤ 5 s, 3 s being recommended

O Wind direction Measuring range : 0° to 359°

Resolution: 1°

Accuracy: < ± 10°

Starting value: < 1 m/s at an initial deflection of 90°

The wind direction shall be specified as an average vector over a sliding time interval of 10 min

O Visibility Measuring range : 10 m to 500 m

Resolution : 10 m Accuracy : ± 10 m or ± 20 % of measured value,

whichever is greater

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