Unformatted text preview: ssure nozzle (1) Immersion tube (2) to the pump (3) Fig. 8.7.3: Filling level monitoring by means of a back pressure nozzle The threaded end of the back pressure nozzle enables the attachment of an
immersion tube. Once the level of fluid in the immersion tube has reached a certain
height, the back pressure nozzle and the pressure amplifier fitted downstream
The pressure of the output signal is proportional to the height of the fluid level. The
maximum pressure of output signal 2 corresponds with the supply pressure.
This solution is primarily suitable for foaming liquids, as pneumatic proximity
sensors only react to the fluid, but not to the foam. 132 © Festo Didactic GmbH & Co. KG • FP 1110 8. Pneumatic proximity sensors x2 1
1 x2 x1 Fig. 8.7.4: Band edge control Fig. 8.7.5: Sensing of instrument pointers © Festo Didactic GmbH & Co. KG • FP 1110 133 8. Pneumatic proximity sensors Fig. 8.7.6: Camshaft control using air barrier sensor Fig. 8.7.7: Counting of glass bottles 134 © Festo D...
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- Spring '12
- pH, proximity sensors, Festo Didactic GmbH, Festo Didactic GmbH & Co