Data Collection Unit

This unit is an electronic data processing unit, which has a microprocessor and memory and is able to perform procedures, control and transmission of data simultaneously. This procedure can be performed either automatically or at the request of the central computer system.
The sound transmission of the measurement results and data of operation of the sensor unit to the central computer, ensured thanks to the integration mechanism of communication errors (CRC), and the transfer repeated if necessary until successful.
 
The memory unit can store measurement data and status of the computer, at least up to 30,000 measurements per channel. The device has the ability to record the measurements of each sensor (sampling rate) per channel per period from 0.1 seconds to 1440 minutes (1 day). Each channel has the possibility of independent choice in the pace of recording measurements. Such data are deleted after confirmation by the host.
 
To meet the needs of each station Sensors used many units as needed for the «reading» of all sensors in parallel. Each unit has ability to support expansion by up to 300 sensors as needed. That may be connected to link master / slave and other relevant data loggers and remote controllers with individual sensors for the collection and aggregation of data communication. The data recorder is such that allows connection to almost any type of sensor, or a simple analog or «Smart» digital.

Furthermore, it can be placed either online, offline or in operation, that has the ability to query the sensors (polling) or in real time with more frequency and 0.1sec as above, or circular, with a choice of sensors of interest to the operator Control Center at a time.
 
The unit is able to perform self-monitoring and report on the computer system of the current mode of the same, and sensors. Plant self-monitoring (watchdog), with the possibility of re microprocessor unit and communication. Programming is done remotely from a central computer, or even locally from laptop PC, provided they have the appropriate software. For this reason, the recorder is equipped with serial port RS-232 for use with computer maintenance and a standard port for communication with the central computer system, either serial or Ethernet / IP.
 
Regarding energy, the drive is low so as not to burden the entire consumption of the Station. Indicative prices are less than (standby mode). Finally, the unit requires little maintenance and has a high MTBF (Mean Time Before Failure), being installed in remote locations.
The data collection unit placed in a special box housing.
 
GSM / GPRS Modem

The GSM / GPRS Modem is installed in a special box which is presented below. The modem interfaces with the unit / collection of data through a simple serial port (RS-232) and the IP camera through 10/100 Base-T Ethernet port.
Each modem stations via GPRS sensor interfacing with the Control Center through a Gateway. The way to interconnect and transfer data is presented below.

Housing Equipment kit

The box housing the equipment is sealed package with the option of outdoor fabric to support and able to accommodate the / units / units of data collection, the GSM / GPRS Modem and all necessary equipment and wiring, connectors and Adapters. The box has IP65 specifications and dimensions greater than 60 cm x 40 cm x 40 cm, it is easy to settle in the interior of all units that have no standards IR65 (sensor temperature / relative humidity, atmospheric pressure, Reading Units, Modems, wiring, etc.)

Power supply unit of the Sensor Stations

The proposed location of sensor stations, three of the four have access to the grid. The fourth station unfortunately lacks access to electricity from the specific point of installation. In the first three cases of photovoltaic panels will be used in conjunction with electricity from the fixed network to cover the days when there is no sunlight and in the latter case we use only alternative energy sources.
Specifically, since the last point (back Kalamaki) is a large part of the course of the day in shade and in winter the hours the days are shorter and the functioning and increased consumption due to the heated sensor using a combination of solar cells and energy.
To that end, photovoltaic systems, which are described in the relevant section on the power supply 150-170W and corresponding energy cells, which assist the power stations in particular in times of low sun and when the battery storage of photovoltaic systems has fallen below certain percentage of security. The system has the possibility of trend output both 12V and 24V.
 
Then describe the key characteristics of units:

Hybrid System photovoltaics and fuel cells

The system consists of photovoltaic cells and fuel cells. Photovoltaics operate continuously and meet the needs of power sensors (sensors, modems and IP cameras). Cooperate with the fuel cell to meet energy needs when the level has dropped.

Hybrid system with photovoltaic cells connectivity to the grid

The system consists of photovoltaic modules connected to the electricity network. Photovoltaics operate continuously and meet the needs of power sensors (sensors, modems and IP cameras). There is automatic interface with the network of electricity at low or no sunlight.

Web Support

The mast support is an appropriate metal construction, height 6 meters, with special support base in the territory, which has resistance at 130 km / h wind data with load sensors, the data collection unit, the GSM Modem and the host box . To better support the special fabric used truss.

How to Web Placement

The placement of the selected sensors follow certain rules to be able to operate optimally without being affected and not-respectively-in turn affecting the neighboring sensors.
Briefly, follow instructions for the installation of sensors in each type of tower support:
 

  • Sensors measuring air temperature and humidity
    • It is protected and well ventilated
    • The level ranges from 1.5 to 2M.
  • Sensors measure temperature and humidity of the substrate surface soil
    • The sensor is installed in the road surface and 25 cm in depth in order to measure the temperature below the surface.
  • Sensors record wind direction and intensity
    • The sensor is mounted at the highest point of the tissue (6 m in height).
  • Visibility Sensors
    • The sensor is mounted at a height of 2M.
    • Avoid exposure to sun or other light source randomly
  • Sensors measuring precipitation (Precipitation, pace, type, quantity)
    • The sensor is installed at a height of approximately 4 m and from other remote sensors
    • Avoid sun exposure or other random source.
  • Sensors measuring barometric pressure
    • Placed to avoid exposure to natural elements and sudden changes in temperature values.
  • Cameras
    • The cameras were placed above and to be clear in view.
    • Ensure that minimize interference from other sensors.
  • Data Collection Unit and GSM / GPRS Modem
    • The Unit / Unit Data Collection and the modem are mounted inside the special box housing on the basis of the tissue.
Configuration of Data Collection Stations shown in the following figure, which shows a station composed of these sensors, a unit of data collection, modem and power supply unit mounted in a tissue at an appropriate rate.
 
 
ESS station and sensors
 
 
Figure 3 ESS station and sensors
 

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