SMHI Automatic meteorological station network

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General info 138

Collected 1/hour by SMHI’s Data Acquisition System NEMO

Communication – PSTN (public switched telephone network), Wireless - Telematik M2M (machine to machine), GSM.

Powered from the grid by 230 V

2 stations powered by solar cells and wind generator (Utklippan, Östergarnsholm)

Log memory 1-3 months

Service - mountain and coast stations every year, all others every second year

Local maintenance person

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SMHI AWS

1 Anemometer, Wind Vane and mast 2 Sensors for Relative Air Humidity and Air Temperature3 Ceilometer4 Sensor for Accumulated Precipitation5 Sensor for Visbility, Present Weather and precipitation intensity6 Automatic Weather Station (AWS) Logger cabinet7 Power Distribution Central

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Stora Sjöfallet (67°30’N, 18°18’E, 425möh)

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• Since Vaisala has stopped producing the Milos system we need to replace our Milos stations.

• We plan to keep all the existing sensors.

• We need to replace the data logger and communication.

• We want to build a system with modular “off-the-shelf” equipment to avoid being in the hands of one supplier, and to have a more flexible system.

• We want to start with IP communication so that we can start using web -cameras etc.

• We wish to find some back up communication system.

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• Our data users wishes for more frequent data acquisition, e.g. every 5-10 minutes.

• We want to transfer more raw data directly to SMHI but still have some kind of data logging at the station in case of communication failure.

• In the future we might use “intelligent” sensors with built-in-communication as stand alone parameters for a more flexible network.

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This is what we are testing since fall 2012

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The real thing

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ICP CON

Modules for communication converting, analog or digital inputs/outputs etc.

fit-PC2i

“fit-PC2 is a miniature fanless PC based on Atom CPU. It is extremely small and extremely energy efficient, but still packs the full set of PC features.”

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Our intension is to test this system with all the sensors we normally use at our AWS.

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Next step maybe. To add a logger to get some redundancy.

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We have built a simple monitoring system in Lab View (National instruments)

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Benefits and disadvantages

+ We will get a more flexible system.+ We can choose devices with a certain function from several suppliers.+ Cheaper to purchase?+ ?

-We need more knowledge about linux programming, ip communication etc “in-house”. Resource consuming.-Incompatible devices?-Risk of getting many different versions of equipment at the stations? Hard to administer?-?

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We wish to get your opinions and experiences of this kind of module built system.

Benefits and disadvantages?

Risks and things to consider?

Thank you!