Patent ID: 9120044
Filing Date: 2015-09-01
Classification: B01D

Abstract:
1. A fume extraction apparatus, comprising: a pressure sensor assembly, the pressure sensor assembly configured for sensing fluid pressure at an outlet to a downstream filter, fluid pressure from an inlet to an upstream filter, and fluid pressure from fluid flowing from an outlet of the upstream filter to the inlet of the downstream filter; and a memory configured for storing multiple predetermined saturation levels for each filter, with different saturation levels indicative of different extents of saturation of each filter from the fluid pressure values; a data processor to process fluid pressure difference values between the respective inlet and outlet of each filter, the data processor arranged (i) to calculate average fluid pressure values from the pressure sensor assembly and thereby determine a saturation level of each filter, and (ii) to determine when a determined saturation reaches a predetermined saturation level and to thereupon cause a pre-emptive alert signal to be generated.