The ACROSTATION o02 is the second version of the family ACROSTATION amongst the ACRONET Modular Elements, operationally used for field installations. According with the new nomenclature, the letter “o” means “outdoor” and substitute the “r” which in the first version was adopted to indicate the “rural” attitude of the station.

The modification of the nomenclature is crucial because the ACROSTATION o02 will be used tout-court even in the urban configurations. Those, in the first version, were described separately.

This decision implies that a o01 version doesn’t exist as well as the r02 and u02.

Each specific variation of the same station will be furtherly featured by a progressive letter (A, B, C, etc.).

PACKAGING

The Modular Elements grouped under the name ACROSTATION o02 are featured by a new packaging. It is used for any variation of the device and it is realized by a polycarbonate external box with double waterproof (IP66) chamber (FIBOX ARCA 302015).ACROSTATION o02_0

This material maintains optimal characteristics of mechanical resistance and improves the capability to resist against chemical agents (i.e., salt) if compared to the metal-based solutions. Furthermore, it allow to adopt internal antennas since it does not represent a shield for electromagnetic waves.

In the front side, the box is equipped with reversible door with PUR gasket key lock, which, opening up to 180 °, allows fast access to the content.

Thanks to its compactness, the box can be easily fixed on civil structures (lampposts, railings, etc.). This can be achieved directly with standard fasteners or with the adoption of adequate support structures (pylons, outreaches, etc.).

Internal

The internal side of the box is subdivided in two distinct parts.

In the lower one, the buffer battery is hosted: this can change (both electrical and dimensional features) according with specific requirements of each configuration.ACROSTATION o02_1

In the upper one, the so-called “castle” is fixed with the metal plate of the box. It is a modular multilevel structure that allows grouping the electronic boards (ACROBOARD) of any specific realization. Furthermore, the “castle” hosts also the interfaces aimed at connectivity and electrical supply.

The solution allows simple interventions where the internal apparatuses can be completely substitute without having to modify the whole installation.

The “CASTLE”

For any station of the family ACROSTATION o02, the whole set of ACROBOARD needed to run the configuration are grouped and fixed in overlapped positions to form a modular multilevel called “castle”.

The castle is made by overlapping one or more electronic cards, in relation to their physical size. They are suitably perforated, so that the mounting bolts may pass completely through the structure and maintain their correct position.

The relative distance of the different layers is maintained by the interposition of suitable spacers.ACROSTATION o02_3

The castle is completed with the zero level, represented by a plexiglass front panel properly drilled. This panel hosts both the 4 bolts “interior” which fix the electronic boards of the other levels, and the 4 bolts “external” with which the whole castle is attached to the steel base of the box. Also in this case, to ensure the minimum distance between the castle and the base 4 outer bolts are prisoners of as many cylinders spacers.ACROSTATION o02_4

The Levels

The outermost layer has the function of support and protection for other electronic boards attached to it. It is made by shaping and drilling a suitably transparent plexiglass panel, so that, upon completion of the installation and positioning in the box, it is always possible a visual control of the LED lamps placed on the boards below.

In fact, at the first level, the “ACROboard Station” is always positioned visible from the outside even after assembly. It is the true heart of the system. It combines the functionality and connectivity data logger and is made so as to condense on its back all the lamps for the control of operation.

A part of the second level is always occupied by a board of the family “ACROboard Power” which normally has the function of charging the device.

Other electronic ACROboard, specific of each configuration, in relation to their relative size, can be added gradually to the castle, completing the second level or into subsequent levels.

The Front Panel

The front panel also has the function of accommodating all the interfaces for the connection of sensors and for the power supply, so that it is possible to act upon them by simply opening the door of the box.

In both cases, we selected quick connectors plug-in with a pin number that varies according to the different configurations, and in particular, the numerosity of the input signals.

In versions connected to the infrastructure ACRONETWORK via GPRS mobile network, the front panel also hosts the connector for a remotized SIM card which can then be replaced without dismantling the castle.

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External Cabling

The cables access from the outside with two separate circuits, dedicated respectively to the data line and the power supply one.

For increased security, the cables are inserted inside proper external conduits, conventionally adopted with a diameter of 25 mm for the data line, and equal to 20 mm. for the power supply.

In the lower part of the box two holes are placed for the separate inlet of the two cable conduits, provided with suitable conduit glands.

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The solution implies that, from the other end of each conduit, in relation to the relative distance of each individual installation, an inspectable junction box is positioned. It is suitably perforated and equipped with conduit glands, in which the circuit can be interrupted, and where, in order to facilitate the phases of assembly, the cables are connected to their sources.

In all cases of single sources, the junction box can not be interposed, and the conduit, suitably sized in length, be connected directly to the housing of the sensor, in the case of the data line, or directly in the control cabinet, in the case of the supply line.

If multiple sources are present, a terminal can be placed in the junction boxes allowing to track the continuity of the terminals of the primary cable from each sensor to the pins of the plug-in connector placed inside the box.