13.03.2019 | V1.81
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Overfill Prevention Controller EUS-2 |
Technical Description
[email protected]
www.timm-technology.de
1.
General Information
As stationary part of the Overfill Preven-
tion System for liquid fuels, the explosion-
proof control unit type EUS-2 complies
with the requirements on overfill preven-
tion systems for bottom-loading tank
trucks according to Annex IV of VOC-Di-
rective 94/63/EC as well as with European
standard EN 13922 and American API RP
1004 recommendations. Timm has com-
bined its longterm competencies in ex-
plosion protection and experiences in
overfill prevention in this control unit.
EUS-2 is characterised by ease of installa-
tion, convenient operation, functional
safety and a user-friendly state-of-the-art
explosion protection concept (IEPC) de-
signed by Timm.
2.
Functional Principle
To ensure a safe filling process, the overfill
prevention controller EUS-2 provides
three main functions:
Overfill prevention
Grounding verification
Vapour recovery monitoring
During loading of tank trucks, the level
sensors at the truck (one sensor per tank
compartment) are connected to the con-
trol unit at the filling gantry by a standard
plug and socket connection. The level
sensors are positioned in the top of each
tank compartment deep enough to as-
sure that once a sensor gets activated,
product flow stops before the compart-
ment is completely full. In case a sensor
senses liquid, the control unit triggers to
shut-off the product flow for all compart-
ments to prevent leakage of fuel or the
compartment’s bursting.
When being connected to a tank truck,
the control unit EUS-2 detects the type of
level sensors (optic/thermistor), the sen-
sor installation (five-wire/two-wire) as well
as the way of ground verification (re-
sistance/ ground bolt) and activates auto-
matically the required operating mode.
For a wide range of applications, tank
trucks with up to twelve five-wire sensors
and eight two-wire sensors are supported.
The control unit verifies permanently the
correct grounding of the truck via the
connection cable. The preset limit value of
this verification can be set according to in-
dividual requirements exceeding EN
13922 requirements.
The vapour recovery hose connection is
monitored on the tank truck via an elec-
tro-pneumatic interlock switch, which is
looped into the grounding verification
line. The control unit EUS-2 ensures that
filling is only possible if the vapour recov-
ery system and the grounding line are
connected properly.
Figure 1: Bottom loading with overfill prevention control by Timm`s control unit type EUS-2
