SU900172A1 - Dew-point hygrometer - Google Patents

Description

I

The invention relates to meteorology, in particular to instruments measuring the humidity of a gas by the dew point temperature.

One of the known condensation hygrometers contains a light source, a condensation mirror, a cooler with a temperature sensor and a device for maintaining a layer of condensate Ø,

The closest technical solution to the invention is a condensation pyrometer containing a light source optically coupled through a condensation mirror mounted on a semiconductor refrigerator equipped with a temperature sensor to a light receiver whose output is connected to the input of a device supporting a layer of condensate and a voltage source W.

A disadvantage of the known device is the limited accuracy of determining the phase of the condensate at a temperature of fl-3iJ C, since on the mirror

condensate may simultaneously exist in the phases of ice and supercooled water.

The purpose of the invention is to improve accuracy.

To achieve this goal, a well-known condensation hygrometer containing a light source optically coupled through a condensation mirror mounted on a semiconductor cooler equipped with a temperature sensor is connected to a light receiver whose output is connected to the input of the condensate bedding device and a voltage source is additionally introduced two circuits are compared, a trigger and a relay, the inputs of the comparison circuits are connected to the temperature sensor, and the outputs are connected to the corresponding trigger inputs, to the output of which is connected A relay is connected through the contacts of which a semiconductor cooler is connected to the output of a device supporting a condensate layer and a voltage source,

H drawing shows a block diagram of the device,

The device contains a source of light 1, a receiver 2 of reflected light, a condensation mirror 3, a semiconductor cooler, a device for determining the phase of condensate made on two comparison circuits 5 and 6, a trigger 7, a relay 8 and a device 9 supporting a layer of condensate.

The device works as follows.

From the temperature sensor included in the semiconductor cooler 4, the signal goes to two comparison circuits 5 and 6, one of which is triggered by a voltage corresponding to the voltage at the mirror temperature, the other is at a temperature of 35 ° C, If the gas dew point temperature during the operation of the device has gone lower, the signal from the circuit 5 is fed to the input of the trigger 7 and sets it to position 1. The trigger, in turn, turns on the relay 8, which contacts the refrigerator k from the device 9 supporting the condensate layer to the source of the marriage, corresponding to the maximum cooling.

The mirror 3 cools down and as soon as its temperature reaches -35 ° C, the second comparison circuit 6 operates and the output from the circuit output goes to the other input of the trigger 7 and sets it to the O position. The trigger 7 turns off the relay 8 and its contacts and reconnect the refrigerator to the device maintain a layer of condensate. Condensation hygrometer goes into operation.

The device provides the mirror overcooling mode before the condensate enters the ice phase. Condensate is in a frozen state until

until the dew point temperature rises above 0 ° C. As a result, the accuracy of determining the phase of the condensate at negative temperatures from 0 to -35 ° C is increased, which

improves the accuracy of determining the humidity of gases.

Claims (1)

1. USSR author's certificate, N 265500, cl. G 01 N 21/50, 1970. 2 Patent of Great Britain No. 13759 7, cl. G 01 N21 / 50, published 197 (prototype).