IWS ICE WARNING SYSTEM - Mierij Meteo
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Mierij Meteo
IWS ICE WARNING SYSTEM
Mierij Meteo • Weltevreden 4c, 3731 AL De Bilt • Postbus 97, 3730 AB De Bilt
Tel.: +31 (0)30 2200064 • Fax.: +31 (0)30 2204264 • Internet: www.mierijmeteo.nl • E-mail: info@mierijmeteo.nl
Mierij Meteo
INTRODUCTION
For a long time people searched for a solution for
the great economical damage that each year in
the winter season occurs as a result of slippery
roads. It is particular the severe damage to peo-
ple, cars, environment and the effects of traffic-
jams, that led to the development of a reliable,
accurate and on-time predicting stand-alone
early Ice Warning System.
The success of this system is a result of the close
cooperation of Mierij Meteo, the Dutch govern-
ment and other companies. The early ice detecti-
on techniques, the algorithms and the optimal
ROAD MANAGEMENT
system configuration have evolved from this coo- Control of road salting operations within city bor-
peration. As a result it generated an Ice Warning ders has become an essential task for various
System that is accurate and 98% operational communities. The government introduces tighter
legal requirements to ensure safer winter condi-
tions and at the same time demands a more effi-
cient use of salt recourses to reduce environmen-
tal pollution. These items and the increase of
financial constraints demand a proper manage-
ment of resources.
In a large urban area the local differences due
the microclimates are considerable. More than
one system can be used, each stand-alone system
will predict the chance that a local area becomes
slippery.
Mierij Meteo • Weltevreden 4c, 3731 AL De Bilt • Postbus 97, 3730 AB De Bilt
Tel.: +31 (0)30 2200064 • Fax.: +31 (0)30 2204264 • Internet: www.mierijmeteo.nl • E-mail: info@mierijmeteo.nl
Mierij Meteo
ICE WARNING SYSTEM
Our Early Ice Warning System is an automated
decision aid for the prediction of slippery roads
and bad weather conditions. Using road surface
and other meteorological sensors both the road
surface condition and the local microclimate are
measured. The system collects and analyzes all
meteorological parameters and predicts the possi-
bility of slippery roads up to 2 hours in advance.
Mierij Meteo’s Ice Warning System not only takes
measurements, but will also generate alarms to
alert winter maintenance personnel to the presen- the present road condition. This system allows the
ce or likelihood of a critical situation developing authorities to act in time to reduce the chance of
on the road surface. slippery roads. The prediction of the road condi-
tion is very reliable. The instruments and measu-
When critical set points or conditions are excee- ring systems are similar to the ones that are used
ded the designated personnel is alarmed by at the Royal Dutch Meteorological Institute
means of a pager. This pager can contain a (KNMI) and used for years to service Dutch road
numeric message to inform the road manager of authorities.
IWS & WEATHER SERVICES
The system can be used to inform a meteorologist
who prepares a detailed road weather forecast.
The meteorologist will transmit this warning
directly to those responsible for road maintenance.
Such forecasts enhance their ability to foresee
dangerous conditions that may develop, thus
providing the time necessary to put into
place counter measures, such as the mobilization
of personnel and equipment. At the same time the
road manager can ‘look’ at the road condition
with a computer or laptop at home or at work.
This enables him to make decisions based on the
meteorological data in combination with other
given meteorological advise.
Mierij Meteo • Weltevreden 4c, 3731 AL De Bilt • Postbus 97, 3730 AB De Bilt
Tel.: +31 (0)30 2200064 • Fax.: +31 (0)30 2204264 • Internet: www.mierijmeteo.nl • E-mail: info@mierijmeteo.nl
Mierij Meteo
SYSTEM DESCRIPTION ICE WARNING
Slippery roads can occur under different condi-
tions. These conditions determine if freezing rain, SYSTEM COMPONENTS
black ice, frost or snow make the roads hazar- • Measuring unit
dous. To detect and analyze all these conditions a • Meteorological unit
computer collects all data from the sensors. The • Road condition sensors
sensors needed for this analysis are: • Presentation unit
• Road surface temperature
• Road surface moisture (conductivity)
• Salt content
• Air temperature
• Relative humidity
• Precipitation
• Wind direction (optional)
• Wind speed (optional)
METEOROLOGICAL UNIT
As weather conditions develop above ground, a
sensor shelter is installed beside the road surface
at a height of 1.5 m. The shelter also serves as a
landmark for the measuring site. The following
actual values are measured in the shelter:
• Air temperature
• Relative humidity
• Precipitation presence
A radiation shield, or thermometer shelter, is
necessary to ensure accurate measurement of
outside temperatures. The special design of the
discs permits a natural flow of air through the
thermometer shelter, even at very low wind
speeds. This prevents the air in the radiation
shield from warming up.
DIGITAL PRECIPITATION clear of old precipitation. These features ensures
A response time of less than 5 minutes.
SENSOR
The digital rain sensor is equipped with a wind During periods of precipitation the temperature of
screen, which prevents the wind from interfering the sensor surface, which is normally maintained
with the measurement. The sensor surface is at 3°C above ambient temperature, is increased
mounted at an angle of 30°, which will keep it to 10°C above ambient temperature
Mierij Meteo • Weltevreden 4c, 3731 AL De Bilt • Postbus 97, 3730 AB De Bilt
Tel.: +31 (0)30 2200064 • Fax.: +31 (0)30 2204264 • Internet: www.mierijmeteo.nl • E-mail: info@mierijmeteo.nl
Mierij Meteo
COMBINED WIND SENSOR
An additional option is to mount a set of wind The substation can also be used to control an
sensors on a 10 m mast to measure the actual automatic spreader, for example for the steel deck
wind direction and wind speed. of a bridge. Ice will form much earlier on the deck
of a bridge than on adjacent road surfaces.
IWS to PC communications are possible over
leased lines, PSTN, fiber-optic, radio etc.
according to individual customer requirements.
ROAD CONDITION SENSORS
Conductivity (water and salt contents) and asphalt
temperature are measured on site in the asphalt,
preferably in each lane. If necessary, deep soil
temperature sensors can be used.
MEASURING UNIT
The measuring unit collects all the actual measu-
ring values and calculates 5-minute means. With
these 5-minute averages the unit will calculated the
possibility of dangerous road conditions. If so it
will page. The data can be retrieved automatically
or manually, this data can be used for archiving
or later evaluation of past events.
Maximum number of connected sensors The road sensors are suitable for dense asphalt or
asphalt with an open structure, brick pavement
Air temperature 1
and clinker concrete.
Relative humidity 1
Precipitation 1
Wind direction / speed 1
Road temperature 6
Road Conductivity 4
Required infrastructure
Cabinet with stainless steel/concrete foundation
Continuously available mains voltage
Connection to a telephone or communication network
Mierij Meteo • Weltevreden 4c, 3731 AL De Bilt • Postbus 97, 3730 AB De Bilt
Tel.: +31 (0)30 2200064 • Fax.: +31 (0)30 2204264 • Internet: www.mierijmeteo.nl • E-mail: info@mierijmeteo.nl
Mierij Meteo
PRESENTATION &
DATA COLLECTION
The Ice Warning System PC208W soft-
ware enables you to interact with the
IWS datalogger using your PC. The
PC208W software operates in
Windows 95/98/2000/XP and
Windows NT environments. The soft-
ware can act as a direct online decision
aid for the road manager. Real-time
graphs are shown in an user defined
time interval. The data can easily be retrieved in
various formats for evaluation in spreadsheet
programs. You can monitor real-time data, retrieve
stored data, and generate simple reports.
PC208W has a floating toolbar that gives you
access to PC208W's primary features. This tool-
bar can be resized and moved.
The IWS software also provides real-time digital
and graphical displays and access status screens.
The software supports multiple IWS stations, thus
a network of IWS stations can be established.
IWS MODEM OTHER APPLICATIONS
The IWS telephone modem is robust and devel- High temperatures of the asphalt and heavy
oped for industrial needs. It can be used as either loading, such as those caused by overloaded
dial-up or leased-line unit and is easily adapted trucks, can cause damage to the road surface.
to a variety of customer needs. The temperature of the asphalt measured by the
IWS can give the road manager a good indication
The IM-64 is designed for a 35 mm DIN rail and of its condition in hot weather. Using this data in
is attached and locked in place with the utmost combination with weather forecasts will give a
simplicity. good prediction of the road surface conditions, so
that precautionary measures can be taken in time.
Contending with icy conditions on airfields is
not really different from that on roads. The IWS is
suitable for this application too. Traffic safety
is the aim in both cases.
Mierij Meteo • Weltevreden 4c, 3731 AL De Bilt • Postbus 97, 3730 AB De Bilt
Tel.: +31 (0)30 2200064 • Fax.: +31 (0)30 2204264 • Internet: www.mierijmeteo.nl • E-mail: info@mierijmeteo.nl
Mierij Meteo RCS – 290 Road conductivity sensor
Operating range 0...999µS
Accuracy 1µS@0...100µS
10µS@100...999µS
SPECIFICATIONS Dimensions Ø 88,9 mm / height 30 mm
Material Stainless steel 316
IWS Measuring unit Cable length 15 m
Supply voltage 230 VAC
Model MP-320RS (B) Meteo pole
Dimensions L x w x h = 400 x 300 x 120 mm
320RS 320RB
Power consumption 50 Watt
soil mounting hard surface mounting
Data storage capacity Three(3) weeks
Dimensions Ø 76 mm Ø 76 mm
Protection IP 55
height 2100 mm height 1200 mm
Static discharge unit All in and outgoing signals
are protected against outside Material Stainless steel 316 Stainless steel 316
inductive interference up to a discharge 307R mounting plate included
power of 1500W Cable length 15m 15m
Model 263 Temperature & Relative humidity RTS – 806T Road temperature sensor
Temperature Humidity Sensor type NTC 2252 Ω @ 25°C
Operating range -20...+80°C
Operating range -30...+40°C 0...100% RH Accuracy ±0.1°C @ 0°C
Accuracy ±0.3°C @ 20°C ±1.5% RH @ 20°C Response time < 0,5s
Dimensions 270 x 80 x 55 mm Dimensions Ø 3,5 mm / length 225 mm
Weight 400 gr. Material Stainless steel 316
Protection IP 65 Cable length 15 m
Model 307R Radiation shield for sensor 263 & 203 Model 665 Combined wind sensor
Dimensions Ø 250 mm / height 400 mm Anemometer Wind vane
Material reinforced synthetic material delrin/stainless steel Operating range 0,5...50 m/s 0...360°
Weight ± 4 kg. Resolution 0,04 m wind run 5,6°
Color Inside dull black, outside white
Mounting Easy exchangeable plate Dimensions Ø 48 mm / 780 x 555 mm
Weight 2,5 kg.
Model 203 Digital precipitation sensor Operating temperature -20...+60°C
Operating range Precipitation Yes / No Material Stainless steel 316 / anodized aluminum 51ST
Operating temperature -40...+60°C Protection IP 65
Dimensions Sensor 56 x 56 x 30 mm
Wind screen Ø 120, h=80 mm IM – 64 AC/DC Industrial modem (optional)
Material Sensor surface Gold 25 µm Supply voltage 12-36Vdc / 230Vac
Wind screen Stainless steel 316 Power Consumption 25 mA @ 230 VAC
Weight 0.5 kg. 200mA @ 12 VDC
Protection IP 65 Line 2-wire for dial up
2– or 4-wire for leased line
Weight 0,6 kg. IM-64 AC0,4 kg. IM-64 DC
Size 55 x 100 x 128 mm
Mierij Meteo • Weltevreden 4c, 3731 AL De Bilt • Postbus 97, 3730 AB De Bilt
Tel.: +31 (0)30 2200064 • Fax.: +31 (0)30 2204264 • Internet: www.mierijmeteo.nl • E-mail: info@mierijmeteo.nl
Mierij Meteo
ORDERING
IWS basic system IWS-2069
IWS basic system with wind sensor IWS-2069W
BASIC SYSTEM SETUP:
• Measuring unit MU-2069
• Sensor static discharge unit SDU-100
• Meteo pole MP-320RS
• Radiation shield (incl. sensors) MH-330R
• Road temperature sensor 3x RTS-806T
• Road conductivity sensor 2x RCS-290
• Presentation & collecting software PC-208W
• Industrial modem IM-64DC/AC
OPTIONAL COMPONENTS:
• Wind sensor Model 665
• Wind sensor plug-in module WM-100
• Wind pole IWS-WP
Mierij Meteo • Weltevreden 4c, 3731 AL De Bilt • Postbus 97, 3730 AB De Bilt
Tel.: +31 (0)30 2200064 • Fax.: +31 (0)30 2204264 • Internet: www.mierijmeteo.nl • E-mail: info@mierijmeteo.nl
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