RU45539U1 - SALT HYGROSTAT OF AIR HUMIDITY - Google Patents

Abstract

Salt hygrostat air humidity refers to devices designed to control air humidity sensors, and can be used in various instruments for measuring and regulating relative air humidity, for example, in the children's compartment of an incubator for newborns, and can also be used to certify reference and control humidity meters, for example, hygrometers. Salt hygrostat of humidity of air consists of a body made of transparent material, for example, organic glass, with cells for installing the sensor, containing different or identical solutions of salts and equipped with devices to prevent the salt solution from entering the sensor and covers that hermetically close the cells inoperative. In this case, the salt hygrostat is equipped with a built-in thermometer, and the number of cells with salt solutions corresponds to the number of specified calibration characteristics of the sensor or the number of monitored sensors. Adaptation from the ingress of salt solution onto the sensor can be made in the form of a mesh, a sleeve or a semipermeable membrane. The name of the salt in the cell and the value of the relative humidity created by the cell are indicated on its side surface and / or cover. The technical result is to increase the performance and accuracy of monitoring humidity sensors.

Description

Salt hygrostat air humidity refers to devices designed to control air humidity sensors, and can be used in various instruments for measuring and regulating relative humidity, for example, in the children's compartment of an incubator for newborns, and can also be used to certify reference and control humidity meters ( hygrometers).

Known humidity generators based on the principles of water evaporation (Album "Equipment for testing for mechanical and climatic influences and reliability", book 1, pp. 135-152, 1989), and made in the form of volumetric chambers, which allow to obtain and automatically maintain the required temperature and humidity in the useful volume of the camera in continuous and cyclic modes according to specified programs. The advantage of such devices is to ensure operation in a wide temperature range with high accuracy. But such cameras are very cumbersome and for their placement at the place of operation requires an area of 15 m ² with a room height of at least 3 m, in addition, they are energy-intensive and expensive.

Stationary and portable hygrostats based on changes in the physicochemical properties of saturated salt solutions are known (article “Stationary and portable hygrostats using saturated salt solutions”, authors G. A. Simonyan et al., “Instruments and Control Systems” magazine No. 2, 1970), the principle of which is based on the property of saturated salt solutions to create and maintain at a constant temperature a constant relative humidity in an enclosed volume above the surface of the solution. The advantages of salt hygrostats over other types of humidity generators are: simplicity of design, high reliability, high stability

the obtained values of relative humidity, the absence of the need for a control hygrometer and the immutability of reproducible values of relative humidity throughout the life of the device. Such hygrostats allow the calibration of humidity sensors directly in the field, as well as create cheap and simple hygrostats available to a wide range of consumers.

Closest to the claimed one is a salt hygrostat of air humidity (Certificate of adjustment procedure 5KO.097.009 YES, published by Vost.-Sib.pravda, 1997), structurally made in the form of a transparent body (glass) made of organic glass with a cell filled to a certain point with a saturated salt solution, and a device from the salt solution falling onto a controlled or reference sensor, made in the form of a grid with holes. In the idle state, a plug is installed on the grid, and the cell is hermetically sealed by a lid on top. Separately, a thermometer is attached to measure the temperature of the air above a saturated salt solution and a graph of the dependence of relative humidity above the salt solution on temperature. Such a device has all the advantages of salt hygrostats and was chosen as a prototype. But it is possible to use only one salt or a sequential replacement of containers (glasses) with salts is necessary, and the establishment of an equilibrium value of humidity occurs sequentially, which requires considerable time for work at various values humidity and affects the accuracy of control.

The problem that this utility model is aimed at is to increase the performance and accuracy of the sensors.

To achieve the specified technical result, the salt humidity hygrostat of air humidity contains a transparent body made, for example, of organic glass, with a cell filled to a certain point with a saturated salt solution and equipped with a device against getting

salt solution on the sensor and a lid that tightly closes the cell inoperative.

The claimed salt hygrostat differs from the prototype in that it contains several such cells at the same time, the number of which corresponds to the number of specified calibration characteristics of the sensor or the number of monitored sensors, and is equipped with a built-in thermometer.

In this case, the adaptation from the ingress of salt solution to the sensor can be made in the form of a grid with holes (as in the prototype), a sleeve or a semipermeable membrane.

The presence of a built-in thermometer and at the same time several cells with salt solutions as sources of several fixed values of relative humidity in one housing at the same time does not require thermostatting of the hygrostat, which allows to increase the performance and accuracy of sensor monitoring.

The transparent body of the hygrostat, made, for example, of organic glass, allows you to visually determine the state of the saturated solution and correct it if necessary (add distilled water if it is lacking or remove it in excess).

The device against salt solution entering the sensor and the lid contained in each cell with salt solutions serves to increase the reliability of measurements and increase the service life of the device. The essence of the device is shown in Fig.1-2.

Figure 1 shows the salt hygrostat (side view)

Figure 2 presents the salt hygrostat (top view).

Salt hygrostat of air humidity consists of a transparent body 1, made, for example, of organic glass, in which cells 2 are located, filled to the mark with saturated solutions of different or identical salts 3, and a thermometer 4, designed to determine

temperature inside the housing 1 and cells 2. A saturated solution of a certain salt 3 creates in each cell 2 a fixed value of relative humidity. Cell 2 contains a device to prevent the ingress of salt solution 5, and when inoperative, it is hermetically closed by a stopper 6 and a lid 7, which can also be made of transparent material, for example, organic glass, and be threaded. The cover 6 is equipped with a rubber gasket 8. For convenience, the name of each saturated salt solution 3 located in cell 2 and the relative humidity created by this cell 2 are indicated on the side surface of the housing 1 and the corresponding cover 7.

Monitoring humidity sensors using the inventive salt hygrostat are as follows.

The controlled air humidity sensor is installed on the device 5, which is built into cell 2, and is kept in cell 2 for 1-2 hours until equilibrium humidity is reached. The tightness of the volume of the cell 2 during control is ensured by means of a rubber gasket 8. After reaching equilibrium humidity, the characteristics of the sensor are fixed at the indicated relative humidity and temperature. Then, cell 2 is sealed with a stopper 6 and cover 7, and the sensor is placed in the next cell 2 with another salt solution 3, which creates a different relative humidity, the value of which is indicated on the corresponding cover 7, and again the process is repeated until it is completed depending on the requirements presented to the humidity sensor. Thus, the values of the dependences of air humidity on temperature at given points are obtained. Since the hygrostat is equipped with a built-in thermometer 4, the temperature of the housing 1 and all cells 2 is the same, thermostating of each cell 2 is not required. In the prototype, it is necessary to measure the temperature of each individual volume with a salt solution, the temperature of which, due to the low thermal conductivity of the air, takes from 0.5 to 2 hours. Also, since the built-in

thermometer 4 allows you to determine and maintain the same temperature at the same time in all cells 2, improves the accuracy of sensor monitoring as a result of a more accurate determination of its characteristics at a specified relative humidity and temperature. Additionally, the productivity of work can be increased by tuning several sensors at once, placed simultaneously in different cells with solutions of the corresponding salts and successively interchanged after the measurement process in each cell 2. Thus, it is possible to determine the characteristics (control) of several sensors simultaneously, the number of which will correspond to the number of cells 2 contained in the housing 1 of the salt hygrostat.

The inventive salt hygrostat humidity is compact and simple to perform. When using it, the acquisition of expensive and bulky equipment, as well as significant energy costs, are not required.

Tests conducted at the FSUE “PA“ UOMZ ”confirmed its effectiveness and compliance with calculated indicators.

Claims (3)

1. Salt hygrostat of air humidity, consisting of a housing made of transparent material, for example, organic glass, with a cell for installing a sensor containing a salt solution and equipped with a device to prevent the salt solution from entering the sensor and a lid that seals the cell inoperative, characterized the fact that it is equipped with a built-in thermometer and at the same time contains several cells with salt solutions, the number of which corresponds to the number of specified calibration characteristics of the sensor or the number controlled sensors. 2. Salt hygrostat of humidity according to claim 1, characterized in that the device from the salt solution on the sensor is made in the form of a sleeve or in the form of a semipermeable membrane. 3. Salt hygrostat of air humidity according to claim 1 or 2, characterized in that the name of the salt in the cell and the relative humidity of the air created by the cell are indicated on its side surface and / or cover.