Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Vapor pressure
Patent
1988-09-08
1989-09-26
Noland, Tom
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Vapor pressure
73 59, G01N 1110
Patent
active
048690988
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a device for analysing the elastic and/or viscous properties of gels or liquids according to the preamble of the appended claim 1.
PRIOR ART
A device of the type defined above is described in the Swedish patent application No. 8205627-6. Although this prior device has led to a substantial improvement concerning the possibilities to analyse the elastic and/or viscous properties of gels or liquids, it has however turned out that its analysing accuracy occasionally is not as good as desired. Other known analysis devices, which are based on different construction principles, have to an even greater extent the same drawback. As an example reference can be made to the device according to the Swedish patent application No. 8104453-9. In this device a movable member is displaced or tipped and the analysis result is based on measurement of the movement which a certain force gives rise to or measurement of the resistance of the liquid against a certain predetermined displacement of the movable member. In the German patent publication No. 2909087 a device is described which is based on the fact that a measuring body is forced to move into, through and subsequently out of a liquid, while the resistance against this movement is measured. In practice the measuring body describes a curved path through the liquid to be analysed.
OBJECT OF THE INVENTION
The object of the present invention is to provide a device, by means of which it has to be possible to obtain very good measurement results with an extraordinary reproduceability so far as the elastic and/or viscous properties of gels and liquids are concerned. In particular it is an object to design the device so that it may be adapted to the gels or liquids to be analysed as well as the demands made upon the analysis results. Depending on the character of the process in which the device is going to be utilized, it is possible that the elastic properties may be more interesting than the viscous ones or conversely.
SUMMARY OF THE INVENTION
The object of the invention is primarily obtained by the embodiment which gives rise to a very simple construction, which imply a maximum of sensitivity of the sensing member and by that a maximum of measuring sensitivity. When the sensing member is moved through the liquid the resistance exerted by the liquid will be directly transmitted to the flexible portion and cause bending thereof and accordingly an output signal typical for the resistance from the sensor, without possible jamming in hinge arrangements and the like leading to a risk of some doubtful measuring results. Thus, the flexible portion will act as a pivot center for the pivoting of the sensing member during the analysis process. For the rest the flexible portion allows the sensing member to act as a flexible member, so that the real movement of the sensing member varies in dependence of the viscosity of the liquid.
It is very important for the attainment of an excellent analysis result that an accurate adjustment of the distance, by which the driving means moves the movable member during the analysis process, may be carried out in dependence of the character of the gel or liquid to be analysed and in dependence of for what purpose the analysis results shall be used. For example in viscosity measurements concerning comparatively thin fluid liquids it has turned out to be suitable to use a comparatively long movement distance. In the application of the device to analysing comparatively viscous gels and liquids it has turned out that substantially improved analysis results are obtained by comparatively short distances of movement. This is in particular the case if the elastic properties of the gel or liquid are of proportionately great importance in comparison with the purely viscous properties. In the application of the invention within cheese production in order to determine the rigidity of a cheese coagulant and by that a point at which the coagulation is to be terminated, there is a desire to cont
REFERENCES:
patent: 4542645 (1985-09-01), Richardson et al.
Brown Charles A.
Brown Charles E.
Ermartic International AB
Noland Tom
Roskos Joseph W.
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