EURO OVERFILL PREVENTION CONTROL DEVICE TYPE EUS-1

General instructions      As stationary part of the Euro Overfill Prevention System the control device type EUS-1 complies with the harmonised requirements on overfill prevention systems for bottom-loading tank trucks according to Annex IV of the VOC-Directive (directive 94/63/EG). In accordance with this directive minimum one bottom-loading station per tank farm has to be equipped with an appropriate overfill prevention system since the 01.01.1999; all the other bottom-loading stations must follow latest on 31.12.2004.     The explosion protected control device type EUS-1 has been developed in full compliance with European Standard EN 13 922 for “Overfill Prevention Systems for liquid fuels”. This standard takes over the technology formerly used for the most part in the Anglo-American market. The result is the full compatibility to equipment and sensors of other manufacturers can be ensured.

      As an electrical equipment of the category II (1) 2 G the control device type EUS-1 is intended for use in potentially explosive atmospheres of the zone 1 and supplies the intrinsically energy for the level sensors on the tank truck (zone 0). It has been proofed by an EC type-examination according to the directive 94/9/E.C. (ATEX 100a). The type of protection is EEx qe ib [ia] IIA T4.

 Principle of Operating

  During loading the level sensors on the tank truck side (one sensor per tank compartment) are connected to the control device at the filling gantry via a standard 10-pole plug and socket connector. The level sensors are positioned in such a way that they trigger the shut-off of the product flow for all compartments via the stationary gantry controller right in time to prevent an overfilling. Level sensors, cable and connectors are also
specified by the EN 13 922 standard.
   When being connected to a tank truck, the control device automatically recognises the type of level sensors (five-wire / two-wire sensors) and activates the required operating mode.
  The vapour recovery hose connection is monitored on the tank truck side by means of a switching contact looped into the circuit of the level sensors. In addition the control device permanently observes the correct grounding of the truck, which is carried out as well by the 10-pole connection cable. As a result it is ensured that filling is only possible, if the vapour recovery system and the grounding line are connected properly.

Special Features:

  The control device type EUS-1 is equipped with four control outputs (two potential-free contact outputs and two potential-free signal outputs), each optionally switchable to different operating modes. Referring to the control signals the control device meets the requirements of the standard for overfill prevention systems and furthermore provides additional control signals (e.g. „Earthing O.K.“ or „Truck Connector in Parking Position“) as well as the possibility of data communication for an optimum control and signalling during the filling process via the product managing system.
  The analysis of the different control signals enables the higher product management system to recognise whether a filling process is only interrupted due to a removable fault (e.g. missing vapour recovery hose connection) or finally completed because of an actual overfilling.
  According to the standard, the control device type EUS-1 exhibits fail-safe behaviour. A filling release is only possible if the periodic self-test operates properly. Interruptions or short circuits in the cabling or in associated components prevent the periodic self-test and thus the filling release.
  The filling status “Permissive” or “Non-Permissive” is indicated by two large LED-indicators, to be visible in a wide range. Additional 9 two-colour LED indicators signal the ”Compartment Status” and the “Earthing Status“.

Accessories Coiled cable type EUS-1-SSK3 (Figure): 10-pole PUR coiled cable (blue) with truck connector and disconnector plug for connection to the disconnector socket type EUS-1-ST or -STP, overall cable length 1.5 m, expandable to approx. 3.5 m.   Coiled cable type EUS-1-SSK7: Same as above, but overall cable length 2.6 m, expandable to approx. 7 m.

Disconnector sockets between the coiled cable and the EUS-1 controller EUS-1-STP: (Figure)  Disconnector socket (to be installed at the filling station) to connect a plug-in coiled cable type EUS-1-SSK7; with additional truck socket with integrated code generator for recognition of the “Truck Connector in Parking Position” status (e.g. for control of traffic lights or a barrier). EUS-1-ST: (not shown) Design without parking socket. The standard length of the cable tail for both designs is 1 m.