SU596839A1 - Apparatus for testing air temperature measuring devices - Google Patents

Description

(54) DEVICE FOR TESTING MEANS OF EXPOSURE

AIR TEMPERATURES

And: (the decree relates to the field of the measuring technique, namely, devices for calibrating means of measuring air temperature, for example, thermometers of resistance.

The known electrical test for calibration of sensor meters. in which a homogeneous hemiuretic field is created and in this field a measurable ter and; dash s. are traced with samples. 1. However, in it it teaches) 1 wyuns and the same measurement factors. It is also known to install AccTBcj for calibrating thermometers under natural conditions, containing the image of a first thermometer, equipped with a radiation, aspirator, individual radiation protection of an exemplary and calibrated thermometers 2. However, calibration with such a device is accompanied by large errors. Depending on the difference between the dynamic variations of the thermometer Thermometers and radiation specimens are unequal. This happens in view of the inevitable difference in the structures and coatings of individual radiation protection of an exemplary and calibrated thermometer.

The main drawback of the device is the inability to correct the dynamic response of the reference thermometer.

Irie corrected by1; 1; the functions of the I – I axial P | 1 conformation i11; p; i, ii oi; ib IX) thermometer to co-ordinate it with the functional 11p1H) brazov1P I of the needle thermometer may be i; i) Bi .-. Ujeii; j measurement accuracy.

The purpose of the invention is poiipscript TOMiiociit iKerkm TcpMOMCTpoii.

This is achieved by those. In the ISBC device, a capacitance d, 1 of placement of an exemplary temometer, made in the form of a cylinder with radial fins inside it, is filled with a liquid and has a fluid volume control unit, and the magnitude is set coaxially to the radiation thermometer.

Such an embodiment of the device makes it possible to regulate the constant time of a model thermal meter.

The time constant depends on the total mass P1 of the thermometer and container with liquid, heat transfer coefficient (between the outer wall of the container and air, equivalent to the specific heat capacity and the nloidad S of heat exchange of the container with AIR, i.e.

g

By changing the mass or by following the volume of the liquid at a constant density, you can change the value of t-.

FIG. Figure 1 shows a tank for adjusting the time constant of an exemplary thermometer; in fig. 2 — placement of a calibrated and exemplary thermometer inside the general radiation protection.

The device contains a tank 1 with radial ribs 2 serving to eliminate a temperature gradient. The container is filled with a liquid, for example alcohol, and there is an exemplary thermometer 3 in it.

In the upper part of the air inlet and outlet, there are two openings with claian 4 and 5 made of rubber sheet to prevent evaporation of the liquid through the openings.

The outlet nozzle 6 of the vessel is connected with a hose 7 to a cylinder 8 having a plug-in 9, by moving which you can change the volume of liquid in the vessel. The elastic section of the outlet pipe has a clamp 10. Above the tank I, there is an aspirator 11 consisting of an impeller with an engine. A container with an exemplary thermometer is housed in an individual radiation protection 12, and a radiation protection 13 serves as a dl. The location of the thermometer in it. If the thermometer to be tested is also scalable, in order to more reliably eliminate the effects of possible temperature gradients, the lower end of one individual protection is connected to the lower end of the other individual protection pipe VKO 14 with an opening.

Insult) Adiabatic protection 15 consists of separate elements 16. During transportation, these elements are nested inside one another, and during operation they are interconnected by foam sticks 17. The overall protection is authorized by the hook 18 for the arm 18.

The constant time control is produced as follows.

The hose 7 is connected to the socket 6, the clamp 10 is removed and, if necessary, the magnification r moves the pistol 9 down. At the same time, the liquid level in the tank rises, the air pressure in the upper part increases, as a result, the valve 4 remains closed, the valve 5 opens, and the excess air comes out. At the end of the operation, both openings are closed. If it is necessary to reduce the value of f, the piston 9 is moved up, the level of liquid in the tank decreases - the valve 5 remains closed, the valve 4 opens, the air pressure inside and outside is equalized, and after the operation is completed, both openings are closed.

At the end of the installation, depending on the operating conditions, the hose can be completely disconnected from the G pipe, and the required amount of fluid can be removed.:: In the tank due to pinching of the socket 6 with the clamp 10

1: if the numerical value of the time constant of the temperature measuring means being tested is known, then the time constant of the standard temperature measuring means iiaxod by conventional methods (for example, using abrupt measurement of the temperature of the medium), adjust it with the described

0 until the numerical value of the time constant of the measuring instrument is matched. If, however, the value of the nonstoy time of the measurement instrument being checked is unknown, then the existing characteristics determine the transition characteristic of the test medium.

5, temperature measurements and transient response of the described exemplary temperature measurement means, making adjustments to match the specified transient characteristics.

For an approximate initial setting of the time constant value, the results of experimental observations on cylinder 8 were marked with an indication of the values of the time constant.

The use of the device allows, without reducing accuracy, to substantially reduce the cost of calibration of measuring means of temperature, eliminate the need for disassembling thermometric devices, causing disruption of the mode of operation of the meteorological information system.

Claims (2)

1. USSR author's certificate number 259433, cl. G 01 K 15/00, 1966. 2. Information materials on hydrometeorological instruments and methods of observation. Collection No. 49 M., “Gidromometiizdat, 1972, p. 12-17. 75 - 77