MEASUREMENT DEUMIDIFICATION POINT, AND METHOD OF CONTROL OF A DEUMIDIFICATION POINT

摘要

A dew point (5) measuring device, for measuring a dew point of a process fluid that flows in a dehumidifying plant (1) for dehumidifying plastics in granular and/or micro granular and/or powder and/or flake or similar form, including a process fluid generator (3) and at least one dehumidifying hopper (4) intended for supplying a respective user machine (2), comprises: process fluid extracting means (6, 6', 6"), which is configured for extracting from the dehumidifying plant (1) a quantity of process fluid and is arranged in an extraction conduit (8) included in the dehumidifying plant (1) and positioned immediately downstream of an advancement direction (A) of the process fluid in the dehumidifying plant (1), of a mixing zone (Z) between a process fluid exiting the process fluid generator (3) and a process fluid exiting at least one dehumidifying hopper (4); and processing means (7), connected to the process fluid extracting means (6, 6', 6"), which is configured for receiving from the process fluid extracting means (6, 6', 6") the quantity of process fluid and determining a dew point value of this quantity of process fluid. The aforesaid process fluid extracting means comprises at least one process fluid extracting tubular element (6, 6', 6") projecting inwards the extraction conduit (8) and provided with a plurality of process fluid extracting holes (13), each configured for extracting a determined quantity of process fluid from a respective inner zone of the extraction conduit (8), this at least one process fluid extracting tubular element 6, 6', 6" being configured for mixing internally these determined quantities of process fluid taken from the process fluid extracting holes (13) and sending a mixture of the determined quantities of process fluid to the processing means (7).