SU148962A1 - Gas moisture meter - Google Patents

Description

Psychrometers with "wet and" hot thermometers, wound as resistance thermometers, are known, and the "wet thermometer is moistened with water from a reservoir through a wick.

These instruments for measuring the humidity of gases, based on the psychrometric method, have a measuring range lying well above the beginning of the existing psychrometric tables.

The proposed instrument for measuring the humidity of a gas, in contrast to the known, has a measuring range from 0 to 0.06% by weight. with an accuracy of +0.05 gLiZ of water in the gas, which lies much lower than given in their psychrometric tables. Such an expansion of the measurement range is achieved by the fact that the "wet thermometer is made in the form of a porous iC sleeve with a resistance coil. In addition, forced wetting of the thermometer was carried out, which was not previously known.

FIG. 1 shows the device sensor device; in fig. 2-inclusion of resistance thermometers in an electronic bridge.

The device consists of two main parts: a sensor and an electronic bridge with two resistance thermometers. A resistance thermometer (R.) for measuring the temperature of the wet surface of the liner and a resistance thermometer R, leading the psychrometric difference to a value independent of the gas temperature, are connected to the electronic bridge.

The resistance thermometer RM is made of copper wire with a diameter of 0.07 mm and has a resistance at 0 ° equal to 103 ohm. The coefficient of resistance versus temperature is 0.384.

RC resistance thermometer is made of nickel wire and has a resistance at 0 ° 75 Ohm. The coefficient of resistance versus temperature is 0.475.

Parallel to the RC resistance, a constant resistance of 150.0 Ω is connected.

Afb 148962-2 The magnitude of the variable resistance Re is made in accordance with the variable resistance RM so that its change from temperature serves not only to compensate for the gas temperature, as adopted in electrosychrometers, but results in an electrically psychrometric difference to a value that depends only on gas humidity.

A resistance thermometer with is manufactured such that its change in resistance from temperature is carried out along a curve approximating the dependence of the temperature of the wet thermometer on the gas temperature.

The sensor (Fig. 1) consists of a wet sleeve / serving as a pelvic moisture analyzer made of molybdenum glass with an outer diameter of 12 mm. The lower part of the liner with a height of 40 m. H is covered with porous glass with a thickness of 0.3 mm.

A resistance thermometer RM is inserted into a sleeve / to a depth of 3-8 mm from the bottom of the sleeve, and a resistance thermometer with is inserted into the same sleeve 70 mm higher than RM A sleeve} is placed in cylinder 2, between which inner wall and the porous surface of the sleeve is formed uniform a gap with a cross section of 0.3 cm.

Porous glass coated on the liner is a good material for wetting the liner. The wetting is carried out by force from the reservoir 3 of water supplied through the schotov filter 4, the capillary p 5 and the droplet. A capillary p 5 with a diameter of 0.1 mm and a length of 20 mm gives 5-8 drops, which are calculated by dropper. Water consumption per day is about 1000 ml with a pressure drop of 0.4-0.5 m. Then the water enters four holes 6 located around the upper part of the porous glass layer. Above the holes there are visors that prevent the gas flow from dropping water droplets along the wall of the cylinder. Excess water coming from reservoir 3 enters reserve 7.

Analyzed the humidity of the pelvis enters the nozzle 8 and passes the annular gap 9 at a speed of 2.5-5 m / s. Out of the gas sensor through the nozzle 10.

The flow stability is controlled by a flowmeter connected in parallel with the sensor.

The secondary main part of the device is an electronic ac bridge type EMD-212. The inclusion of resistance thermometers RM and RC is shown in the diagram (Fig. 2). RM is connected to terminals EMD 11 and 12 of block No. 4 by means of a wire, the resistance of which should not exceed 5 ohms. RC is connected in exactly the same wire to terminals 13 and M of block No. 1.

The voltage drop on a reichord will change by changing its resistance to 3.45 ohms over the whole scale, which corresponds to the measurement range of the chlorine gas humidity from 0 to 0.06% by weight. or from O to 1.5 g1m HzO in chlorine.

The moisture meter passed a long test in the laboratory for measuring the humidity of the air. Three copies of moisture meters are located in Continuous production operation in the chlorine industry workshops.

Subject invention

1. A device for measuring the humidity of gases, consisting of a dry and wet thermometer with a bridge measuring circuit, characterized in that, in order to expand the range of humidity measurement within the below psychrometric tables, the wet thermometer is made in the form of a porous sleeve with a resistance coil . 2. The form of the device according to claim 1, wherein. which, in order to force the wet thermometer to be forcedly wetted, by: the latter is connected by a tube with a pressure tank with water.

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FIG. 2