Patent ID: 7250302
Filing Date: 2007-07-31
Classification: G01N,Y10T

Abstract:
1. A method for ensuring reliable measurement values when measuring the content of solid substance in a fluid with an optical sensor/sampler, by periodical cleaning of the sensor/sampler through flushing thereof with a combination of water and pressurized air supplied through water and pressurized air lines, respectively, and in the form of a jet stream, the method comprising the steps of: a) arranging the sensor/sampler above a sludge container or sludge line and connecting the sensor/sampler to said container or line through a hose or pipe line so that the sensor is permanently provided separate from the body of the solid substance content of which is to be measured; b) initiating a measurement sequence by flushing the sensor/sampler with said jet stream of pressurized air and water; c) feeding sludge from said sludge container or sludge line to the sensor/sampler with one of a vacuum pump and a pressure generating pump; d) measuring the content of solid substance in the fluid with the optical sensor/sampler for a predetermined period of time so that the sensor is not submerged in the fluid but is only exposed to said fluid during the actual measuring period; and e) repeated flushing of the sensor/sampler with water and pressurized air.