JPH07218318A - Liquid level and precipitate height measuring device - Google Patents

Abstract

PURPOSE:To enable simple, rapid and accurate automatic measurement by providing a vertically long insulating plate, a detection part and an electrostatic capacity measuring part. CONSTITUTION:Detection parts are parallelly provided to the vertically long insulating plates attached to a holder 2 at the upper ends thereof at a small interval. Interval holders 3 connecting the insulating plates 1 are provided to the intermediate parts and lower ends of the insulating plates 1 and the spaces between the insulating plates 1 are opened downwardly and laterally and a substance enters the spaces. Electrode plates 4 having an equal area are arranged to the opposed surfaces of the insulating plates 1 at an appropriate interval and copper wires are connected to the respective electrode plates 4 from the holder 2. A measuring part 6 measures the electrostatic capacities between the electrode plates 4. Gas (a), a liquid (b) and a precipitate (c) are successively arranged in a liquid storage tank from above and the differencies of a dielectric constant between them are grasped as the change of the electrostatic capacities of the electrode plates 4 by the measuring part 6 and the measured results of the measuring part 6 are sent to a control unit such as a computer or the like to know the heights of the boundary surfaces of the gas (a), the liquid (b) and the precipitate (c).

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] The present invention is a measurement for measuring the liquid level and the height of sediment in various liquid storage tanks such as pollution control in manufacturing plants, water and wastewater treatment plants and construction works, and sludge and sewage treatment facilities. It is related to vessels.

[0002]

2. Description of the Related Art Conventionally, when measuring the liquid level in various liquid storage tanks and the height of sediment, when a person inserts a rod and feels the pressure change when the tip of the rod contacts the sediment, Either by knowing the height of the upper part of the precipitate by the insertion length of the rod, or by pulling out the tip of the rod after contacting it with the bottom of the tank, and by knowing the deposit height of the precipitate by the deposit attached to the rod. .

[0003]

However, such manual measurement is troublesome and labor-intensive, and continuous measurement cannot be performed even when the height of the measuring object changes, and the measuring accuracy is high. Absent.

An object of the present invention is to provide a liquid level and sediment height measuring device which solves the above-mentioned disadvantages of the prior art and enables simple and quick and accurate measurement by automatic measurement.

[0005]

In order to achieve the above-mentioned object, the present invention is provided with vertically long insulating plates arranged in parallel at a small interval, and electrode plates are provided in the longitudinal direction of the insulating plates on the surfaces facing each other. A detection unit arranged at an appropriate interval, and a measurement unit for measuring the capacitance between the electrode plates having the same facing area,
In addition, the insulating plate is provided with a holder connected to the measuring part by a cable at the upper end, and this holder is used as the uppermost space retainer, and crosspiece-shaped space retainers connecting the side ends of the insulating plate are connected to the middle and lower ends. The purpose is to set up. The electrode plate is thinly coated with an insulating material so that the electrodes are not short-circuited even in liquid.

[0006]

According to the first aspect of the present invention, the electrode plates having the same area are arranged at equal distances in the vertical direction by the insulating plates facing each other, and if the same voltage is applied between the electrode plates. , Its capacitance changes depending on the dielectric constant of the substance between the electrode plates. That is, a gas such as air, a liquid and a precipitate have different permittivities between the electrode plates, and by measuring which of these positions the permittivity between the electrode plates corresponds to, the gas, You can know the height of the interface between liquid and sediment.

According to the second aspect of the present invention, in addition to the above-mentioned action, the holder portion serves as a support portion, and the whole is hung through this portion for setting. Then, it is possible to easily obtain a structure in which the insulating plates are assembled in parallel by the holder portion and the bar-shaped spacing holders and the electrode plates are arranged at equal distances.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a liquid level and sediment height measuring device of the present invention, and FIG. 2 is a principle explanatory view.

The measuring instrument of the present invention comprises a detecting section and a measuring section. Of these, the detecting section has a vertically long insulating plate 1 attached to a holder 2 at the upper end thereof, and is suspended from the holder 2 in parallel at small intervals. To be installed.

At this time, the insulating plate 1 was provided with crosspiece-shaped spacing members 3 connecting the side ends to each other in the middle and at the lower end. As a result, the insulating plates 1 that are parallel to each other have open surfaces at the lower end and the lateral sides, and a substance enters between them.

Electrode plates 4 having the same area are arranged on the mutually opposing surfaces of the insulating plate 1 at appropriate intervals in the length direction of the insulating plate 1. The electrode plate 4 is wired with copper wires from the holder 2.

Further, the holder 2 is connected to the measuring unit 6 by a cable 5.
The measuring unit 6 includes a power supply unit, a signal detecting unit, a signal determining unit, and a signal external output unit, and has a function of measuring the electrostatic capacitance between the electrode plates 1.

In this way, the measuring instrument of the present invention is set by suspending the holder 2 or the like.

[0014] It is represented by.

Therefore, if the same voltage is applied to the electrode plates 1 arranged at equal distances and having the same area, the capacitance thereof changes depending on the dielectric constant of the substance between the electrode plates 1.

As shown in FIG. 2, gas a, liquid b, and precipitate c are lined up in order in the various liquid storage tanks from the top. The difference in dielectric constant between these is measured as a change in capacitance of the electrode plate 1. Find out in Part 6. The measurement result of the measuring unit 6 is sent to a control device such as a computer, whereby the gas a, the liquid b,
The height of the boundary surface of the precipitate c can be known.

[0017]

As described above, the liquid level and sediment height measuring device of the present invention is capable of performing accurate measurement easily and quickly by automatic measurement.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a liquid level and sediment height measuring device of the present invention.

FIG. 2 is a principle explanatory view of the liquid level and sediment height measuring device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Insulating plate 2 ... Holder 3 ... Space | interval holding body 4 ... Electrode plate 5 ... Cable 6 ... Measuring part

Claims (2)

[Claims] 1. A detection unit in which vertically long insulating plates are provided in parallel at a small interval, and electrode plates are arranged on the surfaces facing each other at appropriate intervals in the lengthwise direction of the insulating plates, and areas facing each other. A liquid level and sediment height measuring device comprising a measuring unit for measuring the electrostatic capacitance between electrode plates having the same height. 2. The insulating plate is provided with a holder at the upper end, which is connected to the measuring section by a cable, and this holder is used as a space holding member at the uppermost end, and a middle of the space and a lower end of the insulating plate are connected to each other to form a bar-shaped space. The liquid level and sediment height measuring device according to claim 1, further comprising a holder.