ES1062109U - Electronic densimeter for liquids (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Electronic liquid densimeter, characterized in that it comprises sensor means (1) and (2), a differential transducer (10), an electronic processor of the signal (11), and a transmitting means (12) and/or (13) a remote computer data processing device. (Machine-translation by Google Translate, not legally binding)

Description

Electronic density gauge for liquids.

Object of the invention

The present invention relates to a simple and effective electromechanical device for measuring the density of liquids, especially designed for applications where current market solutions are inconvenient or unfeasible.

Background of the invention

As designers and equipment manufacturers electronic, we have not found so far, neither we nor our competition, densimeters that allow us to provide a solution suitable to the needs of our market.

There is a great diversity of devices based on the measurement of the density of a liquid directly to from its weight, detecting the thrust on a float or indirectly from properties of the fluids in which Density intervenes along with other parameters.

We know other patents that they present, between others, the inconvenience of having to make holes in the vessel wall The densimeter described here has, among others, the advantage of being able to install and replace a plug standard of a container, without requiring more outer space.

The densimeter described here achieves the precision we need with exclusive cost and simplicity for our preferred applications, while being a Interesting alternative for other applications.

Description of the invention

The present utility model refers to a device that calculates the density of a liquid from the measurement of the weight of a portion of liquid between two level lines located at different depths .

The principle of operation is inspired by the "pipette", which the Royal Spanish Academy defines as "tube of widened glass in its 5 middle part, which serves to remove from a vessel small amounts of liquid, for which it is introduced into this one covering with a finger its upper hole; etc.".

The present utility model refers to a device that places two tubes, not necessarily straight or of constant section , arranged in principle so that the holes of one end are outside the liquid to be measured, hermetically connected to both sides of the membrane of a differential pressure transducer and we will call the device "dry end". Next, the other two ends of these tubes are left open and kept submerged at different depths in the liquid whose density we want to measure. Hereinafter we will call this end "wet end" together with the piece that maintains this separation. The differential pressure transducer, through the appropriate electronic circuit, will provide the microprocessor with an electrical signal depending on the density of the liquid and the difference in depth at which the two open holes of both tubes are submerged.

Keeping the difference constant and invariable deep at the open and submerged ends of the tubes (wet end), the microprocessor calculates, after calibration, The density of the liquid to be measured with stability and precision.

The present utility model refers to a device capable of using this obvious and well-known physical principle to obtain a practical and economical commercial product . For this they have needed to solve, among others , the problems that are posed below:

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The density of the liquid must be measured " in situ ", in the same container, without the need to extract or pump samples.

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The device must be able to easily accommodate a plug, float or element next to the liquid or its container.

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The two tubes must have the adequate geometry in each case, so that the compensation and "differential" corrections are effective.

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The diameter of the holes open and submerged (wet part) must be in each case the appropriate depending on the application, considering the presence or not of possible suspended particles that can clog these holes

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You have to ensure the dry end tightness throughout the life of the device.

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You have to ensure the invariability of the differential height between the two holes open from the wet end.

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When liquids are very aggressive or corrosive, all and each of the parts and components of the device.

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The device must adapt easily to the application, preferably using the natural openings of the container, such as float caps, etc., without having to resort to drills or machining.

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The device must include, by technical imposition, the measurement of the temperature in one or several liquid points

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If the liquid is homogeneous This device should give us a measure of constant density, independent of the depth at which the end is submerged "damp". If there is stratification or it is not homogeneous, the device will give the average value of density between levels at the holes in the "wet" part are submerged. In the applications that require it, must be able to measure different liquid columns at different depths.

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To undertake with advantage certain preferred applications, the electrical consumption of all device must be exceptionally low, feature that It implies a careful electronic design and a "firmware" Ingenious enough

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The device, according to options, you must incorporate a reduced screen, indication of limits, alarms, registration and communications, fulfilling functions such as re-calibration, adaptation to different fluids, alarm programming, presentation and sending of data, which are an obvious result of the state of the art.

Brief description of the drawings

The description is made below with a variant, in a preferred, but not limiting, form of realization of the Electronic Densimeter of the present invention, for whose best understanding is accompanied by two drawing sheets, given merely by way of non-limiting example, whose figures they are a schematic representation in elevation, with the purpose of enumerate and describe the characteristic parts of this Model of Utility. In Figures 1 and 2 the same number of identification of common parts. Listed below are the  characteristic pieces, underlining those that are subject to claim in the following chapter:

one)

Long tube that transmits high pressure to the hermetic chamber B of the pressure transducer.

2)

Short tube that transmits low pressure to the hermetic chamber A of the pressure transducer.

3)

Depth separator , whose function is to keep the height (H) unchanged between the open and submerged holes of the tubes (1) and (2).

4)

Pole depth, whose function is to keep the separator (3) submerged at the desired fixed depth (P). It can be a rigid piece forming an assembly with the pieces (1), (2) and (3), as described in Fig. 1. In other cases this piece (4) could be a rod, wire or cable. In any case this piece is functionally a vindicable element.

5)

Choke , optional part required in some cases to produce a controlled narrowing in the tubes (1) and (2).

6)

Ballast , which serves as a counterweight to keep the separator (3) vertical, in case the box (9) is adapted to the float function, as shown in the example of Fig. 2.

7)

Interposition fluid, liquid or gas, with which the cavities A and B of the pressure transducer and part of the tubes (1) and (2) are filled.

8)

Temperature transducer housed in the separator (3) at a defined height, normally (H / 3), in thermal contact with the liquid being measured. This piece itself It is commercial and is NOT subject to claim.

9)

Box , or housing whose function is to support and protect the assembly, housing inside the pressure transducer, the microprocessor, and the various electronic components. This box is adaptable in form and functionality, to the requirements of the particular application. As a non-limiting example we show Fig. 1, in which this box takes the form of a cap , according to characteristics imposed by the container. In Fig. 2 the box takes the form and functionality of a float for applications where it is necessary to measure the density at a fixed depth with respect to the surface of the liquid.

10)

Differential pressure transducer This piece itself is commercial and is NOT subject to claim.

eleven)

Electronic circuit that operates as support of the conditioner, microprocessor, log memory, and  communications This part is descriptive only and is NOT claimed in this document.

12)

Bus Two-wire for communication and power. This part is just descriptive and NOT claimed in this document

13)

Optional antenna for systems Wireless This piece is only descriptive and is NOT claimed in this document.

14)

Container (tank, glass, tank, etc.). This part is only descriptive and is NOT claimed in this document.

fifteen)

Liquid measured. The nature of this liquid conditions the forms and materials employees. In itself this liquid (15) is only part Explanatory figure.

Description of a preferred embodiment

The brief and schematic description of Fig. 1 refers to our preferred application, characterized by the fact that the box (9) adopts the form of screw cap adapted to the container (14), the latter alien to the utility model that Here it is described. In this case the density is measured at a fixed depth (P) with respect to the container.

The brief and schematic description of Fig. 2 refers to a variant of our preferred application, characterized by the fact that the box (9) takes the form of a float . In this case the density is measured at a fixed depth (P) with respect to the surface of the liquid.

This application and its variant are NOT limiting , claiming those forms that result from obvious adaptations of the same model, as an alternative to the density measurement in other liquids or systems.

Describe sufficiently the nature of the The present invention, as well as how to implement it, is states that whatever does not alter, change or modify its principle fundamental may be subject to variations in detail.

Claims (7)

1. Electronic Densimeter for Liquids, characterized by the fact that it comprises sensor means (1) and (2), a differential transducer (10), an electronic signal processor (11), and transmitter means (12) and / or (13) a remote data processing device. 2. Electronic Densimeter for Liquids according to claim 1 characterized in that the sensor means consist of two tubes (1) and (2), whose upper ends are hermetically connected to a differential pressure transducer (10), and whose lower ends are submerged in the liquid to be measured (15), at a depth (P) defined by a pole (4), although each lower end ends in a hole that is located at a different and invariable depth (H) by a separator (3). 3. Electronic Densimeter for Liquids according to the claim, characterized in that it includes a part (5) that throttles the internal ducts of the tubes (1) and (2) before joining them with the inlets of the pressure transducer (10 ) 4. Electronic Densimeter for Liquids according to claim 1 characterized in that a protective fluid is interposed within the tubes (1) and (2) between the liquid (15) and the transducer element (10). 5. Electronic Densimeter for Liquids according to the claim, characterized by incorporating a thermal transducer (8). 6. Electronic Densimeter for Liquids according to claim 1, characterized in that all its components are adhered to a box (9) which is the cap (Fig. 1) of the container. 7. Electronic Densimeter for Liquids according to claim 1 characterized in that all its components are attached to a box (9) which is a float on the liquid to be measured (Fig. 2), equipped with a ballast (6) .