SU1213406A1 - Thermoelectric dew-point hygrometer - Google Patents

Abstract

The invention relates to instruments for controlling the humidity of the air. To extend the functionality, the hygrometer is equipped with a thermal flow sensor installed on the surface of the mirror. The measuring circuit contains two circuits NIN and two inverters, which allows determining the temperature of the air and the dew point when the thermo battery reaches. At these times, the thermopile is disconnected from the power source and connected to the temperature meter. 2 Il. u 00 4ib

Description

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The invention relates to a measurement technique, namely, instruments for monitoring air humidity, and may find application in technological processes of heat and humidity treatment of air.

The aim of the invention is to enhance the functionality of the hygrometer.

Fig. 1 shows a hygrometer measuring unit; figure 2 - structural diagram of the hygrometer.

On the one hand of thermoelectric power unit 1, the junctions are stabilized in a null thermostat 2 (for example, thermoelectric one), and on the other side there is a copper condensation plate 3 with a miniature, for example, thermoelectric heat flow sensor 4. The presence of dew on the surface of the condensation plate is monitored by a dew sensor 5 (for example, photoelectric).

A heat flux sensor A mounted on the surface of the condensation plate is connected to a null indicator 6 (FIG. 2}, to one of the inputs of the matching circuit 7, and through an inverter 8 to one of the inputs of the matching circuit 9. - The dew sensor 5 is connected to the second input of the circuit 9 from the output and via the inverter 10 to the second input of the matching circuit 7. The output of the null indicator 6 and the output of the matching circuit 9 are connected to the switch 11, and the output of the matching circuit 9 is connected to the reversing device 19, to which the output 7 is also connected match. The device 19 is connected to the thermoelectric battery 1, and the thermoelectric device 1 together with the switch 11 is connected to the temperature measuring transducer 13.

The device works as follows.

In the initial state, the temperature of the condensation plate is higher than the air temperature. The heat flux is directed from the plate to the air, and the heat flux sensor 4 generates a positive signal. Dew on the surface of the plate is absent therefore, at the output of the dew sensor 5, the signal is zero.

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The magnitude of the signal from the heat flux sensor. At the moment when the temperature of the plate becomes equal to the air temperature, the heat

there is no flow from the plate to the air and the heat flow sensor signal is zero. At the same time, at the output of the null indicator 6, a signal is generated that controls the switch 11.

The switchboard makes a temporary disconnection of the thermoelectric battery I from the power supply circuit and connects it to the temperature measuring transducer 13, by which it measures

Thermal emf corresponding to air temperature.

Upon further cooling of the condensation plate, its temperature becomes lower than the air temperature and a negative signal is generated at the output of the heat flow sensor, which is converted by the inverter 8 into a positive one and fed to the input; schemes 9 matches. At the time of the occurrence of dew on the surface of the condensation plate, the dew sensor 5 generates a positive signal, which also enters the input of the coincidence circuit. If there are two positive signals at the input, the coincidence circuit generates a signal that controls the reversing device 12 and the switch 11 of the switch 11. The switch provides the measurement of the battery's thermoelectric power corresponding to the temperature

dew point, and the reversing device switches the thermoelectric battery into the heating mode of the condensation plate.

 The temperature of the condensation plate rises and becomes higher than the air temperature, and the heat flow sensor signal entering the input of the coincidence circuit becomes positive. When the dew evaporates from the surface of the condensation plate, the signal of the dew sensor becomes equal to kul. The zero signal is converted by the inverter 10 into a positive one, as a result of which

the second positive signal is fed to the input of the matching circuit. In this case, the coincidence circuit generates a signal controlling the reversing device and the thermoelectric switch.

switches to cooling mode

condensing plate. Device.; returns to its original state, and the measurement cycle is repeated.

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Claims (1)

Invention Formula A thermoelectric condensation hygrometer containing a thermoelectric battery with a condensation plate on one surface and a null thermostat on another surface, a dew sensor, is a reversing device, a switch, a temperature measuring transducer and a zero indicator, characterized in that in order to expand the hygrometer's functional capabilities It contains two coincidence circuits and two inverters mounted on the surface of the condensation plate. 4 A heat flux sensor connected to a null indicator and one of the inputs of each matching circuit, and with the input of the second matching circuit through an inverter, the dew sensor connected to the other inputs of each matching circuit, let's take with the input of the first matching circuit through an inverter, matching circuit outputs connected to the reversing device, the output of the second matching circuit and the output of the null indicator are connected to a switch that is connected to the measuring transducer temperature, which is connected to thermoelectric. Fmg.1 Compiled by V.Ekaev Editor T.Kugrsheva Tehred T, Tulik 777/54 Circulation 778 Subscription VNIIPI USSR State Committee. for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Branch PPP Patent, Uzhgorod, Proektna St., 4 2 Proofreader E.Sirozman