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Overview
1
Overview
Under the German Water Resources Act, vessels with water-polluting liquids must be equipped
with overfill prevention devices. In other countries, the corresponding national rules and regu-
lations must be observed. In the case of storage tanks which are filled by tank vehicles, the
overfill prevention device consists of an Overfill Prevention Sensor (e-OPS) in the storage tank
and an Overfill Prevention Controller installed in the tank vehicle.
The Overfill Prevention Sensors 81 D-Ex and 83 UV-… approved to standard EN 13616, and the
Overfill Prevention Controller approved to prEN 16657 in the tank truck (tanker) provide this
overfill prevention device - see the Figure below:
1 Overfill Prevention Sensor 81 D-Ex… or 83 UV-…
2 Measuring transducer
3 Signal amplifier
4 Controller (Tank truck Management Computer TMC)
5 Actuator
Function
At the lower end of the probe tube the Overfill Prevention Sensor contains a sensor (PTC ther-
mistor). The measuring transducer transmits changes in resistance to the signal amplifier in
form of binary signals. According to the resistance value (liquid level in the tank), the actuator
in the tank truck is either opened so that the fuel can be filled or closed so that the fuel supply
is interrupted.
Connection between the Overfill Prevention Controller and the Overfill Prevention Sensor
The connection between the Overfill Prevention Controller on the tank truck and the Overfill
Prevention Sensor on the tank is made via a connecting cable with a socket coupler which is
inserted into the connection fitting (see Figure below). Depending on the tank filling method,
two different connection fittings are used for the connection to the Overfill Prevention Sensor:
1)
Overfill Prevention Sensor with
pipe fitting
for the direct filling of individual tanks.
The socket coupler is inserted directly into the
pipe fitting
on the Overfill Prevention
Sensor.
2)
Overfill Prevention Sensor with
junction box
and
wall fitting
for remote filling.
The socket coupler is inserted into the
wall fitting
which is connected to the Overfill
Prevention Sensor in the tank by an extension cable.
(4)
(5)
+ ϑ
L
(1)
(3)
Overfill Prevention Sensor
in the storage tank
Overfill Prevention Controller in the tank truck
Overfill prevention device
(2)
E
