The process of filling inflammable liquids for transportation or storage, safety standards and procedures must
ensure that the static voltage which occurs during this process, should not lead to an explosion.
To handle this static voltage, the vehicle or the container should be properly earthed. This is important so that
the static voltage does not build up to a dangerous flash point . The Earthing method should be proper and
perfect, otherwise dangerous losses can take place.
The OSNA ERU - EARTHING RELAY UNIT gives complete reliability and assurance of a true and correct
grounding for maximum safety in all loading operations for variety of loading applications for use with tank
trucks, rail cars, air craft refuellers.
The core unit has been successfully used by over 5000 of Industrial users for over 15 years. The ATEX
Approved WE77/Ex-ERU which is the core of the Earth Relay Unit are certified from the BUREAU VARITAS
in Germany / ISSeP in Belgium / PTB in Germany . Housed in IECEx / ATEX Approved enclosure for
II 2G Ex d II C T6 Gb.
Principal users in Chemical plants and other hazardous areas are HPCL, IOCL, BPCL, RELIANCE ( marketing
terminals ) and other explosive areas like GAIL, IPCL, ONGC, NFC, and paint units to avoid static change.
The unit is manufactured according to European standards The Trip Amplifier is
intrinsically safe and is galvanically isolated from both input and output control circuits.
The ATEX Directive in Europe prescribes a Quality AUDIT of the factory producing the ATEX certified units.
Which means that an inspector from the foreign NOTIFIED BODY inspects the OSNA factory regularly without
notice to ensure that the Quality assurance is conforming to the ATEX Directive