Device for measuring pressure and controlling a flow

Abstract

The invention relates to a system for measuring cell turgor pressure (dendroturgometer), which can also operate as a firmometer. The system can also be used as an automatic dripper, wherein in this embodiment it is kept pressed by means of a flattening plate (1) against the organ (4), as well as by employing a brace (6) provided with a spring (5) that applies stable force of a magnitude higher than the product between the water pressure, regulated by a pressure adjuster (10) and the fluid layer (2) under the membrane (3), on which the plant exerts compression and obstructs the water flow. The dripping is started when the transpiration provides a drop in the cell turgor pressure of the plant, so that the resulting pressure will be lower than the adjusted water pressure. This system may also be miniaturized and used for measuring the vegetable turgor pressure by using water pressurization with an plunger (11). The cell turgor pressure is achieved with a pressure transducer (12), as the lower pressure applied that forces the passage of water through the layer (2). Alternatively, the system may be mounted for operation as a dendroturgometer in a closed system with a cover (13), and a pressure transducer (12), while a brace applies press force with a spring (5) to enable continuous reading of the turgor pressure in the stern.

Dependencies are inferred from the claim text.