Measuring and testing – Sampler – sample handling – etc. – With constituent separation
Patent
1989-12-12
1991-07-23
Raevis, Robert
Measuring and testing
Sampler, sample handling, etc.
With constituent separation
7386481, G01N 100
Patent
active
050333194
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
THIS INVENTION relates to a filtering and sensing assembly and system for continuously obtaining a solids free filtrate from a slurry or solids loaded liquid process, which shall hereinafter be generally referred to as a "slurry", and obtain a real time process measurement thereof. Moreover, the invention enables a continuous filtrate sample to be obtained from a slurry which is constantly representative of conditions within the slurry and provides for appropriate sensing and measurement of such conditions.
BACKGROUND ART
In certain industrial processes, it is necessary to obtain a particular measurement of a condition within a slurry flow, for example the pH level, using precision instruments. In order to obtain an accurate measurement it is necessary to extract a clean solids free liquid from the slurry, on which relevant measurements can be performed.
With previously existing systems for such measurements, much time is usually taken in obtaining the often clean solids free liquid from the slurry material before a measurement can be taken. Hence by the time the actual sensing is performed on the solids free liquid, the measurement obtained is often times no longer representative of the existing condition of the slurry.
Additionally, in controlling such industrial processes, it is desirable to provide a continuous measurement of a condition of the slurry, so that adjustments can be made to the introduction of condition altering additives or the like to the slurry. A problem with systems currently adopted for this continuous measurement is that once a quantity of clean solids free liquid is obtained, it has been difficult to continuously replace the obtained liquid with a constantly representative sample of liquid reflecting the existing conditions of the slurry.
DISCLOSURE OF INVENTION
It is an object of the present invention to provide a filtering and sensing assembly and system which can continuously obtain a solids free filtrate from a passing slurry, which filtrate is relatively closely representative of a particular condition of the slurry.
It is a further object of the invention to provide a filtering and sensing assembly which can be located in a passing slurry to obtain a real time process measurement of the slurry.
In accordance with one aspect of the present invention, there is provided a filtering and sensing assembly for obtaining a real time process measurement of a slurry comprising: detachably mounted upon said mounting assembly for contacting said slurry and combining with said mounting assembly to define an enclosed inner chamber for receiving a solids-free filtrate filtered from said slurry; said inner chamber and at the other end to a pump means to continuously extract said solids free filtrate from said inner chamber; and mounting assembly such that the sensor head of said sensor probe reposes within said inner chamber to contact said solids free filtrate prior to extraction through said passage; liquid Within said slurry can continuously filter to situate within said inner chamber said solids free filtrate.
Preferably, the filter member is in the form of a cup having: an open end adapted to be detachably mounted to a complementary connecting portion of said mounting assembly, a base opposite said open end, and a generally annular wall portion comprising said porous filtering material; said cup being disposed for immersion within said slurry such that the outer surface of said annular wall portion is exposed to said slurry.
A filtering and sensing assembly for obtaining a real time process measurement of a slurry comprising:
a mounting assembly for location within said slurry;
filter member detachably mounted upon said mounting assembly for contacting said slurry and combining with said assembly to define an enclosed inner chamber for receiving a solids free filtrate filtered from said slurry;
a passage provided within said assembly for communicating at one end with said inner chamber and at the other end to a pump means continuously extract said solids free filt
REFERENCES:
patent: 4112768 (1978-09-01), Holland et al.
patent: 4501161 (1985-02-01), Endo et al.
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