SU35413A1 - Instrument for determining the humidity of gases or vapors - Google Patents

Description

The invention relates to instruments for determining the moisture content of gases or vapors based on measuring the electrical conductivity of the gas or vapor under investigation.

. Molecules of saturated steam exist in the presence of certain intervals between them, depending on temperature. With a decrease in these gaps, the vapor condenses, while increasing, it approaches on the properties of k gases (superheated steam).

Wet steam is a mixture of steam and water; thus, there is more water per unit volume of wet steam than in dry, saturated steam.

The more mixture molecules per unit volume, the more electrically conductive the medium will be. Consequently, at constant pressure, with increasing humidity of the steam, its electrical conductivity increases and vice versa.

With the same degree of vapor moisture, with increasing pressure and the associated temperature increase, steam density increases, and its conductivity increases.

In the proposed device for determining the moisture content of gases and vapors, in order to automatically change the distance (408):

Nor between electrodes with temperature changes placed in the test medium, one of the electrodes is mounted on a curved tube filled with a fluid that is easily boiling.

The drawing shows a diagram of a device for determining the humidity of gases and vapors.

Two electrodes 1 and 2 are placed in the vapor space A, the ends of which are at a certain distance between them. If from any source 9 of electricity to the terminals 6 and 7 of the electrodes to bring the current, then its force in the circuit will depend on the electrical conductivity of the medium between the electrodes 1 and 2, and the greater the humidity in the space A, the greater the current flowing through the circuit An 8-millimeter or galvanometer-mounted sensing device will indicate the degree of vapor moisture.

With increasing pressure (temperature), steam density increases and,. consequently, its electrical conductivity increases with the same1 degree of moisture of the vapor. In order for this calibrated galvanometer (device) 8 to serve under increased pressure, it is necessary to increase the distance between the electrodes, which is achieved -,. : -. . , -. : - 2: ..., - aBTjDMaTH4 HH thanks to the bent tube 3, which is filled with light liquid. As the pressure increases, the temperature increases and the end of electrode 1 moves away from electrode 2 in order to maintain the same resistance at the same humidity, but at a different pressure. With increasing steam overheating, its density decreases and, consequently, the conductivity decreases; on the other hand, as the temperature increases, the electrode 1 moves away from the electrode 2, therefore, the current in the circuit decreases, as a result of which the vapor overheating is also determined by this device. A galvanometer may have, instead of a scale of current strength, a scale of clamsiness. in percents . To determine the humidity of the air, an instrument constructed according to the same principle will also give indications of the degree of humidity of the air at different temperatures, since as the humidity and temperature increase, the electrical conductivity of air increases. - The subject of the invention. A device for determining the moisture content of gases and vapors, based on the measurement of the electrical conductivity of the gas or vapor under investigation. In order to automatically change the distance between the electrodes 1 and 2 placed in the test medium with a change in temperature, one of the electrodes is fixed on a curved tube 3 filled with easily boiling liquid.