SU367379A1 - PSYCHROMETER FOR MEASURING MOISTURE WITH NEGATIVE TEMPERATURES - Google Patents

Description

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The invention relates to the field of measurement technology, in particular to a psychromatic for measuring humidity at negative temperatures.

Known psychrometers are used to measure the moisture content at negative temashtraurs, which contain dry and wet thermosensitive elements, aspirator and heater placed in the channel.

The purpose of the invention is to improve the accuracy of measuring the relative humidity of the air at negative temperatures by minimizing the magnitude of the temperature gradient in the working channel of the psychrometer.

This is achieved by performing a heater in the form of a reochord wound on the outer wall of the working channel of the psychrometer in which the heat-sensitive elements are placed.

Ia drawing schematically shows the proposed psychrometer.

The psychrometer contains a working channel I, in which dry 3 and wet 4 temperature-sensitive elements, a water reservoir 5, an aspirator 6, an organic glass tube 7 for fastening the moist heat-sensitive element and a heater 8 wound on the outer wall are housed in block 2 working channel.

At negative ambient temperatures, the temperature inside the working channel of the psychrometer is kept constant () by automatically maintaining the air temperature in the channel / as indicated by one of the dry temperature-sensitive elements. 3. The technique and technique for measuring the humidity of the air does not change. The temperature gradient along the length of the channel and over the section in

psychrometer is almost zero.

The device has a small capacity of the working tank with water and is designed for short-term (up to 15 hours) measurements of air humidity at negative temperatures.

In order to ensure the efficiency of the preheater, in the inlet part, an increased tenla discharge is created. For this, the heater is made sectional - in the form of

several sections, for example, in the first section, allow a smaller step of winding or use a wire with a smaller section.

Subject matter

1. A psychrometer for measuring humidity at negative temperatures, containing dry and 30 wet temperature-sensitive elements placed in the working channel, an aspirator and a heater, characterized in that, in order to improve accuracy, the heater in it is in the form of a radiator, external wall of the working channel.

2. Psychro; 1, characterized in that, in order to increase the efficiency of the preheater, in one of them the reyhord is 1y-filled with sectional section with different winding pitch.

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