The filling sensor is a safety mechanism to prevent overfilling of storage and bunker tanks when they are filled with gasoline, diesel, and fuel oil from road tankers. It consists of a level sensor inside the tank and an amplifier with valve inside the road tanker. The QSS/ASS plugs are part of a safety system that prevents the blending of products due to a faulty connection and that checks the hose connection to the road tanker during the filling process.
- Proven millions of times – measuring principle functions reliably under the most difficult conditions
- Completely maintenance-free – robust design without moving parts
- Internationally certified – In Belgium, Germany, Austria, Poland, Czech Republic and Sweden
- Versatile – Approved in accordance with ATEX, TRbF 511 and TRbF 512
The electrical connection to the amplifier is made with the connection cable and coupling type 903 of the road tanker. This connection cable supplies the GWG with intrinsically safe electric current. In addition, it carries the signals for the QSS and ASS function. The threshold point of the GWG inside the tank includes a PTC-resistor. The PTC resistor is a variable resistance in relation to the rising temperature. As liquids are better thermal conductors than air or gas, the PTC-resistor heats up better in air or gas. When dipped into liquid, the PTC-resistor is cooled down, and the changing resistance value is interpreted by the amplifier. The amplifier controls a solenoid valve which is part of the control chain of the valve. If the threshold point of the GWG is dipped into liquid, the valve is closed automatically. The filling process is completed. The QSS functions are carried out by the simple pairing of magnetic reed sensor codings between plug and coupling. The ASS function is based on checking the closed circuit between amplifier, connection cable, GWG, filling nozzle, filling hose and hose connection in the road tanker.