SU798677A1 - Two-phase mist water-content meter - Google Patents

Description

(54) TWO-PHASE MIST WATER METER

I

The invention relates to a measurement technique and is intended to measure the water content of two-phase media (fogs).

According to the main author. St. No. 342159, a two-phase mist water meter is known that contains a pipeline in which two electric heaters and thermocouples are installed to measure the temperature of the drawn air on each of the heaters. It is necessary to place it before taking measurements in a room where there is no fog, what is necessary to do to calibrate the instrument. This complicates the operation of the device and eliminates the automation of the measurement process, as in real conditions of operation

there is often no fog in the premises.

The purpose of the invention is to eliminate these drawbacks and to increase measurement accuracy.

The goal is achieved by the fact that a third heater is additionally introduced into the meter, which is installed in the flow chamber in front of other heaters along the air flow in the pipeline, and this heater

i is connected to a power source

 your switch.

To automate the measurement process, a time-program block is connected to the device, connected to the switches through which the power source is connected to the heaters and the air pump.

Claims (1)

FIG. 1 shows the proposed meter; in fig. 2 shows a scheme for thermometry of air using thermocouples. The meter is an air blower 1 made of material with low thermal conductivity, such as foam plastic, and has chambers 2 and 3 in which flat heaters 4 and 5 of the same power are installed, made of co-wired wire, for example mica nye, plates. The temperature measurement in the flow is made by thermocouples 6 and 7, 8 and 9 and with indication by the galvanometer 10 according to the scheme shown in FIG. 2, Upstream heaters 4 and 5, in the course of the air flow in pipe 1, an additional heater 12 is installed in chamber 1.1, which is connected via switch 13 to power supply 14, which is connected via switches 15 and 16 to heaters 4 and 5, as well as air pump 17. To all the switches are connected to the time-program block 18. The proposed device operates as follows. The air sucked into the duct 1, when measuring water, is slowed down near heater 4, while the water droplets are dried. on the heater 4, and the thermo pair 8 and 9 - the temperature difference L. t, on the heater 5. The difference temp. i - - tO The temperature is determined by the iO galvanometer due to the counter-switching of thermocouples 6, 7 and 8, 9. Before measuring the water content, calibrate the device, which includes a switch 13, through which current from the power source 14 enters the heater 12 in which water droplets are evaporated when air is pumped, as a result of which air flows to heaters 4 and 5 without water droplets. After 5 minutes, the necessary dp warm-up device. installation is made gal. Vanometer 10 by introducing a compensation current into the thermocouple circuit. 74 In order to measure the water content in the medium, the switch 13 is turned off, as a result of which the heater 2 is turned off and the air passes with droplets to the heater 4, where these droplets are dried. After this, the temperature difference on heaters 4 and 5 is measured on a scale of a galvanometer 10 calibrated by temperature and then the water content is determined by the formula e "QLT where K T} .1.5-2.5 is the coefficient determined for this .3 device design experimentally. To ensure the automation of measurements, the signal from the program-time unit 18 is supplied to the switches 13, 15 and 16 in accordance with the measurement program recorded, for example, in the program-time unit 18 on a magnetic tape. In this case, instead of a galvanometer dp of recording the water content of the medium, a recorder can be used, and, for example, electromagnetic relays as switches. Thus, when using the proposed device, the introduction of the device in the room without fog to calibrate the device is eliminated, which leads to easier operation of the device, expansion of its field of application, and the possibility of automating the measurement process. . Claims of Invention Two-phase fog meter according to ed. No. 342159, characterized in that, in order to increase accuracy, it is additionally equipped with a third electric heater installed in the flow chamber in front of two other heaters along the air flow in the duct and equipped with a switch. Sources of information taken into account in the examination 1. USSR author's certificate No. 342159, cl. G 01 W 1/00, 1970 (prototype). 40 FIG. 2