Electrolytic humidity sensor

FIELD: measurement technology.

SUBSTANCE: electric insulating base, electric insulating substrate onto which moisture-sensitive coating is applied on the base of gelatin which has its external layer tanned, two plated electrodes which have contact surface to contact with moisture-sensitive coating on base of gelatin and measuring device connected to outputs of plated electrodes. Two clamping units are introduced into the device additionally. Any clamping unit intends for creating permanent pressure of corresponding plated electrode onto working surface of moisture-sensitive coating on base of gelatin. Layer of gelatin coating has uniform thickness. Contact surface of plated electrodes adjacent the moisture-sensitive gelatin-based coating is made to be oxidized and flat.

EFFECT: prolonged service life; higher stability of operation; increased moisture resistance.

5 cl, 1 dwg

 

The technical field to which the invention relates.

The invention relates to measurement technology and is designed for continuous monitoring of humidity and gases and can be used, for example, in the chemical industry, in agriculture for the control of humidity in the premises or in containers.

The level of technology

The famous "humidity Sensor gases [see Ed. mon. The USSR №541137, CL G 01 W 1/11, publ. 1976], containing a non-conductive substrate coated with moisture-sensitive coating of the monocrystalline epitaxial gallium arsenide and two metal conductive electrode.

This non-conductive substrate coated with a moisture-sensitive floor and two conductive electrodes form together the so-called moisture-sensitive element.

A serious disadvantage of this device is that it is moisture-sensitive element is essentially monolithic, i.e. rigid fastening to the substrate with a moisture-sensitive coating of conductive electrodes, making it impossible to replace in case of failure of individual components of the moisture-sensitive element (for example, conductive electrodes or only the substrate with a moisture-sensitive coating). Thus, in case of failure come the Xia to replace the entire moisture-sensitive element entirely.

The closest analogue to the stated object is "Electrolytic humidity sensor [see ed. mon. The USSR №286291, CL G 01, 1965], selected by the author as a prototype.

This is the prototype includes an insulating base, a flexible insulating substrate coated on its surface is moisture-sensitive coating on the basis of gelatin outer layer which sadubin, two overhead metal electrode contact surface which is in contact with the moisture-sensitive coating based on gelatin, made of shaped, spring-loaded rod, a cap with a metal mesh, a measuring device connected to the leads of the overhead electrode.

The advantages of the device of the prototype should include the possibility of replacement when failure is not only entirely moisture-sensitive element, and only some of its components (for example, invoices electrodes or only insulating substrate with a moisture-sensitive coating).

Among the drawbacks of the prototype should be attributed to its lack of stability and moisture resistance, and insufficient service life of the sensor and the complexity of its design.

The essence of the invention.

It is known that the problem of determining and maintaining the proper level of humidity is placed in the s and tanks is very relevant to the various sectors of the national economy.

The basis of the present invention is supposed technical solution to the problem of creating such a humidity sensor, which would not only possessed high stability and moisture resistance, but would be quite simple and durable.

If implementation of the proposed sensor humidity are achieved by the following technical results:

- increasing sensor life;

- the simplification of the structure of the sensor;

- increased stability of the sensor;

- increases the moisture resistance of the sensor.

Getting a new technical result is achieved by the electrolytic humidity sensor containing insulating base, insulating substrate coated on its surface is moisture-sensitive coating on the basis of gelatin outer layer which sadubin, two overhead electrode, the contact surface which is in contact with the moisture-sensitive coating based on gelatin, and a measuring device connected to the leads of the overhead electrode, additionally introduced two clamping node, each of the two pressure nodes is designed to create a constant pressure of the corresponding surface electrode on the working surface of the moisture-sensitive coating on the basis of gelatin, and the contact surface of the overhead electrode, with the drinking with moisture-sensitive coating on the basis of gelatin, performed oxidized and flat.

In the sensor, each of the two pressure nodes includes a spring guide spring bracket, the fastening element.

In the sensor, both overhead electrode is made of metal, for example, silver or titanium.

In the moisture-sensitive sensor coating on the basis of gelatin outer layer which sadubin, the insulating substrate is made in a layer of uniform thickness from 1 to 5 microns.

In the moisture-sensitive sensor coating on the basis of gelatin outer layer which sadubin, insulating substrate contains a tanning agent - Dubrovskiy potassium in the following ratio, wt.%:

gelatin0,4-0,6
Dubrovskiy potassium0,3-0,5
chloride lithium0,9-1,0
waterrest

Thus, the set of essential features of the present invention is sufficient to achieve provided by the invention of new technical results. Thus, the present invention meets the criterion of "inventive step".

The essence of the proposed devices will explain with the help of the drawing, which shows the proposed device, the Spa is a single, side and top.

The proposed device includes:

two overhead electrode - 1;

- elektroizoljatsionnye substrate - 2;

- moisture-sensitive coating on the basis of gelatin outer layer which sadubin - 3;

- - electrical insulating base 4;

two spring - 5;

two guides for the spring - 6;

two bracket - 7;

two fastener - 8;

measuring device 9;

- the conclusions of the overhead electrode 10.

The main blocks of the proposed device perform the following functions.

In the present invention the insulating substrate 2 coated on its surface is moisture-sensitive coating on the basis of gelatin outer layer which sadubin,3 form together with the two patch electrodes 1 a so-called collapsible moisture-sensitive element responsive in working condition for a change in the humidity of the air.

The use of demountable moisture-sensitive element allows you to quickly replace individual components out of service (for example, only the overhead electrode 1 or only the insulating substrate 2 coated on its surface is moisture-sensitive coating on the basis of gelatin outer layer which sadubin, 3), and not all moisture-sensitive element entirely.

Each of the Vuh pressure nodes of the proposed device is designed to create a constant pressure corresponding surface of the electrode 1 on the working surface of the moisture-sensitive coating on the basis of gelatin, the outer layer of which sadubin 3.

Each of the two pressure nodes may include, for example, the spring 5, the guide for the spring 6, the bracket 7, the fastening element 8.

In the present invention as a tanning material for moisture-sensitive coating on the basis of gelatin outer layer which sadubin 3 used the tanning agent - Dubrovskiy potassium (K2Cr2O7) in the following ratio, wt.%:

gelatin0,4-0,6
Dubrovskiy potassium0,3-0,5
chloride lithium (LiCl)0,9-1,0
waterrest

The proposed composition of the moisture-sensitive coating based on gelatin allows you to get the film on the insulating substrate 2, which after zagubieni (for example, using ultraviolet light) is not soluble in water, but retains the high hygroscopicity. Zagubiony outer layer of moisture-sensitive coating based on gelatin protects its internal nezadelannyh layer from the strain.

Moisture-sensitive coating on the basis of gelatin outer layer which sadubin 3 should be the same thickness. This thickness can vary from 1 to 5 microns.

In p Edegem the humidity sensor both are included in the overhead electrode 1 may be made of metal, for example, silver or titanium.

In the present invention, the part of both overhead electrode 1, which is in contact with the working surface of the moisture-sensitive coating on the basis of gelatin outer layer which sadubin,3 is made flat and smooth.

Flat and smooth contact surface of the overhead electrode 1 at small thickness of the moisture-sensitive coating on the basis of gelatin outer layer which sadubin, 3 is preferable in the case where the contact surface of the overhead electrode 1 is made of profiled (for example, in the form of parallel semi-circular grooves).

In the latter case, when a small thickness of the moisture-sensitive coating on the basis of gelatin outer layer which sadubin, 3 not all contact the surface of the overhead electrode 1 will be used for the purpose.

In addition, in the present invention, the part of both overhead electrode 1, which is in contact with the working surface of the moisture-sensitive coating on the basis of gelatin outer layer which sadubin, 3 insulating substrate 2 is made of pre-oxidized. The use of oxidized metal can improve the stability of the sensor, humidity and significantly increase its life.

In addition, the use of pre is varicella oxidized metal overhead electrodes 1 allows to achieve a consistent near-electrode resistance, that's why we have the ability to reduce the electrical resistance of the moisture-sensitive film, i.e. reduce its length and thereby to eliminate the necessity of podpruzhineny, that also allows to considerably simplify the design of the proposed sensor humidity.

In the assembled condition, each of the specially selected spring 5 must provide the required constant pressure on the corresponding invoice electrode 1.

In other words, we can say that in the assembled form of a moisture-sensitive element is tightened to the insulating base 4 two springs 5.

It should also be noted that when installed in a working position, each of the springs 5 is the desired position in the construction of the proposed "humidity Sensor" with the corresponding guide for the spring 6, made for example in the form of a rod of variable cross-section that fits the corresponding spring 5. One end of each of the two rails of the spring 6 rests on the upper portion of the corresponding bracket 7.

During final Assembly, we offer a "humidity Sensor" each of the two part bracket 7 is rigidly attached to the insulating base 4 by means of two corresponding fastening elements 8. The measuring device 9 are connected to the EN to the conclusions of the overhead electrode 1.

Information confirming the possibility of carrying out the invention.

The proposed sensor humidity at the location of its moisture-sensitive element in the medium works as follows.

So, its moisture-sensitive coating on the basis of gelatin outer layer which sadubin, 3 comes in sorption equilibrium with the environment by absorbing or releasing moisture. Thus, when the sorption equilibrium amount of moisture contained in the moisture-sensitive coating on the basis of gelatin outer layer which sadubin, 3 would be a function of the relative humidity of the environment. On the other hand, the conductivity of the moisture-sensitive element depends on the amount of moisture contained in the moisture-sensitive coating on the basis of gelatin outer layer which sadubin, 3. Determining the conductivity of the moisture-sensitive element of the measuring device 9 connected to pin 10 of the overhead electrode 1, determine the relative humidity of the environment with the use of calibration characteristics.

The proposed device, the types of materials used for the manufacture of insulating substrate 2, the insulating base 4, springs 5, the guides for springs 6, the brackets 7 and fasteners 8 may be different.

So, for example, as material for the insulating substrate 2 may be used, for example, the flexible base film.

Insulating base 4 may be made for example from plastic.

The spring 5 may be performed, for example, of an elastic steel. Guides for springs 6 can be performed, for example, in the form of rods made from plastic.

The brackets 7 may be implemented by a metal, for example, from aluminum.

Fasteners 8 may be implemented, for example, in the form of standard screws or bolts.

In conclusion, I would like to note that the proposed "humidity Sensor" can be practically implemented using known devices. Thus, the present invention fully meets the criteria of the invention "industrial applicability".

1. The humidity sensor containing insulating base, insulating substrate coated on its surface is moisture-sensitive coating on the basis of gelatin outer layer which sadubin, two overhead electrode, the contact surface which is in contact with the moisture-sensitive coating based on gelatin, and a measuring device connected to the leads of the overhead electrode, characterized in that the sensor further introduced two clamping node, each of the two pressure nodes is designed to create a constant pressure corresponding nakladni the electrode on the working surface of the moisture-sensitive coating on the basis of gelatin, which is performed in a layer of uniform thickness, and the contact surface of the overhead electrode in contact with the moisture-sensitive coating based on gelatin, oxidized and made flat.

2. The sensor according to claim 1, characterized in that each of the two pressure nodes includes a spring guide spring bracket, the fastening element.

3. The sensor according to claim 1 or 2, characterized in that both the overhead electrode is made of metal, such as silver or titanium.

4. The sensor according to claim 1 or 2, or 3, characterized in that the moisture-sensitive coating on the basis of gelatin outer layer which sadubin, the insulating substrate is made in a layer of uniform thickness from 1 to 5 microns.

5. Sensor according to any one of claims 1 to 4, characterized in that the moisture-sensitive coating on the basis of gelatin outer layer which sadubin, insulating substrate contains a tanning agent - Dubrovskiy potassium in the following ratio, wt.%:

Gelatin0,4-0,6
Dubrovskiy potassium0,3-0,5
Chloride lithium0,9-1,0
WaterRest



 

Same patents:

FIELD: measurement engineering.

SUBSTANCE: device can be used for monitoring of humidity of environment in meteorology, climatology and ecology. Two sensitive members, both made of shape memory effect alloy, are placed in air space. Difference in deformation between first and second elements is converted at difference in humidity to movement of writing element along diagram tape fixed to drum of clockwork. Sensitive elements are functionally connected to each other according to differential circuit. Clockwork is supplemented with sensitive element made of shape memory effect alloy and second drum which is combined together with the first one by first diagram tape.

EFFECT: improved precision.

1 dwg

FIELD: measuring engineering.

SUBSTANCE: instrument comprises a device for converting absolute humidity into electrical signal and recording device. The converter has multi-stage amplifier which consists of at least two amplifiers. The feedback circuit of the amplifiers is provided with semi-conducting thermistors. The thermistors are chosen to provide a given value of B=B1+…+BN, where B1,…, BN are the parameters which define temperature dependences of their resistances Ri = R∞iexp(Bi/T). The multi-stage amplifier is provided with a correcting amplifier whose feedback circuit is provided with a resistor with the positive temperature resistance coefficient.

EFFECT: enhanced accuracy of measuring.

1 cl, 3 dwg

FIELD: analytic chemistry.

SUBSTANCE: method comprises injecting water into the gas flow. The water is obtained by burning hydrogen on the heated cuprum oxide. Hydrogen is obtained by electrolyzing 30-% solution of orthophosphoric acid in distillated water.

EFFECT: enhanced accuracy of setting humidity.

1 dwg

The invention relates to hygrometry

The invention relates to techniques for measuring the humidity of gases

The invention relates to electrical measuring technique, is designed for measuring and controlling humidity and can be used in various fields such enterprises electronic, textile, food industries, warehouses for storage of industrial products and food, museums, archives, etc

The invention relates to measuring equipment

The invention relates to measuring technique and can be used mainly for measuring air humidity, and humidity control in humidistat and industrial installations

The invention relates to measurement techniques, in particular to alagomeji, and can be used for measuring the humidity of the atmospheric air, as well as to control humidity in humidistat and industrial installations, including remote humidity control

The radiosonde // 2029322

The invention relates to techniques for measuring

The invention relates to measuring equipment

The invention relates to measuring equipment

The invention relates to a technique of measuring the

Hygrometer // 2219532
The invention relates to techniques for measuring the humidity of gases

The invention relates to the measurement of moisture in natural gas

The invention relates to techniques for the measurement of impurities in compressed gases

The invention relates to process control of nuclear power plants

The invention relates to the field of gas analysis

FIELD: measurement technology.

SUBSTANCE: electric insulating base, electric insulating substrate onto which moisture-sensitive coating is applied on the base of gelatin which has its external layer tanned, two plated electrodes which have contact surface to contact with moisture-sensitive coating on base of gelatin and measuring device connected to outputs of plated electrodes. Two clamping units are introduced into the device additionally. Any clamping unit intends for creating permanent pressure of corresponding plated electrode onto working surface of moisture-sensitive coating on base of gelatin. Layer of gelatin coating has uniform thickness. Contact surface of plated electrodes adjacent the moisture-sensitive gelatin-based coating is made to be oxidized and flat.

EFFECT: prolonged service life; higher stability of operation; increased moisture resistance.

5 cl, 1 dwg

Up!