Measuring and testing – Liquid level or depth gauge – With other measuring device
Patent
1984-05-17
1987-01-13
Yasich, Daniel M.
Measuring and testing
Liquid level or depth gauge
With other measuring device
331265, 137558, 374142, G01F 2304
Patent
active
046354786
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for measuring, by means of a manually operable portable measuring apparatus, the physical properties of the contents of the tank, said device including a probe being sensitive to the medium to be measured, said probe being connected to a reel means through a tape measure having means for positional read-off.
It is previously known devices where a measuring probe is lowered into a container in order to detect liquid surface by letting a slit between two acoustic transducers or a transmitter and a receiver be filled with liquid. Such a device is only capable of detecting whether there is liquid present or not. Such a slit has in addition the property of being easily clogged by the medium to be measured in case it is of high viscosity type.
The present invention is therefore intended to record the transition between liquid and gas, and/or the transition layer between two liquids or other medium to be measured.
It is also intended to let the temperature at the location of measurement be measured by having a combination probe.
The present invention to be described further solves the problem of detection of level and transition layers by providing high accuracy, independently of the nature of the medium to be measured. Simultaneously, the effect of hysteresis is minor, and there are no cleaning problems, in addition to the fact that three properties may be measured by one single probe. Further, the probe is capable of being adjusted such that it may record an interface between two media without the body of the probe touching said interface.
The device consists of a manually operable apparatus having a reel upon which is wound a graded tape measure having integrally connected therewith electrical conductors. The combination probe is attached to the free end of the tape measure, said probe being capable of registrating a sharp and well-defined interface between gas and liquid as well as a mixed transition layer between two liquids by means of a sensing device responsive to the electrical properties of the ambient measuring medium, in particular dielectric constant and loss factor. The temperature is recorded by means of a temperature sensitive current generator or modifier. An indication of the probe reaching the liquid surface or possibly the mixed transition layer between two liquids, appears either as an acoustic signal from an audio signal transmitter arranged at the center of the said reel means or as change in current being registered on a suitable indicator. The temperature may be read off on a display together with or combined with the means for reading off the other parameters arranged at the center of said reel. The actual position of the tip of the probe may be read off on the tape measure by means of a suitable indicator.
The present device is particularly suitable in cases where the medium to be measured is of such nature that the probe is not capable of penetrating into the medium. This may be the case with high-viscosity liquids, particles or medium being of such a nature that it is not of advantage to have contact between the probe and the medium to be measured, or that the medium is of such a nature that a change in dielectric constant or loss factor is the most suitable or the only method for recording a transition layer.
The invention is now to be further described with reference to the enclosed drawings wherein
FIG. 1 shows a section through the manually operable apparatus according to the invention,
FIG. 2 shows a front view of the manually operable apparatus of FIG. 1,
FIG. 3 is a valve device adapted to cooperate with the sluice of the manually operable apparatus illustrated in FIGS. 1 and 2;
FIG. 4 shows a scrape-off means which cooperates with tape measure and is capable of draining off possible electrostatic charges created in connection with unwinding of the tape;
FIG. 5 is a view in cross section illustrating in detail the sluice/valve element of the embodiment of the inventive apparatus shown in FIG. 3;
FIG. 6a shows the relationship of the pro
REFERENCES:
patent: 812269 (1906-02-01), Horton
patent: 2284396 (1942-05-01), Pfeiffer
patent: 3098914 (1963-07-01), Giannino
patent: 3500546 (1970-03-01), Pilcher
patent: 4226023 (1980-10-01), Gravert
patent: 4255859 (1981-03-01), Klieman
Tanksystem A/S
Yasich Daniel M.
LandOfFree
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