Overfill alarm system

December 2009 Level Measurement & Control

The AFRISO WATCHDOG overfill alarm system NB 220 QSA, consisting of the level sensor type 76(A, C, E, M, N) and the transducer NB 220 QSA serving as level controller, is designed to prevent overfilling of tanks with water-polluting liquids. The overfill alarm may be used on stationary tanks storing water-polluting liquids such as fuel oil, biodiesel, diesel, gear oils, hydraulic and vegetable oils. The level sensors may be used for fluid temperatures from -25 to 50°C (version H up to +80°C).

Operational safety is high since the unit continuously monitors the characteristic of the level sensor and checks for short circuits and cable breaks between the level sensor and the level controller. If a signal is generated, the filling process is interrupted and the unit triggers audible and visual alarms. Control lamps as well as a test and a reset button at the front ensure easy operation.

The system has the technical approval Z-65.11-193 of the German Institute for Building Technology.

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