SU1352246A1 - Device for measuring mean temperature value of medium sections with heterogeneous temperature pattern - Google Patents

Abstract

The invention relates to the field of temperature measurements. The purpose of the invention is to increase the measurement accuracy and simplify the device. The wired thermocoupler 2.3 forms a series circuit with a resistor 4.3 and a current generator 3.3 and, together with the thermoconverter circuit 2.2, forms a bridge circuit, the outputs of which through amplifier 5.2 are connected to the input of switch 6, which connects the corresponding amplifier 5 to the registration unit 7. Such inclusion of wire thermocouples 2.3 makes it possible to single out a voltage proportional to the resistance and average temperature of trimming, equal to the length difference between the first 2.1 and second 2.2, second 2.2 and third 2.3, etc. converters. 2 Il. with "(L

Description

Fig

The invention relates to temperature measurements, namely, devices for measuring the average temperature of medium sections with a non-uniform temperature field, and is intended for use in environmental control systems and technological processes.

The purpose of the invention is to improve the measurement accuracy, as well as to simplify the device.

FIG. 1 shows a diagram of the device; in fig. 2 is a diagram of a distributed thermocouple.

The device (Fig. 1) contains a distributed thermocouple 1, made in the form of a bundle of n wired thermocouples. Figure 1 shows a device containing three wired thermocouples 2.1, 2.2 and 2.3 (), three generators 3.1, 3.2 and 3.3 currents, the first terminals of which are connected to the first terminals of the thermocouples 2.1, 2.2 and 2.3, and the second - respectively to the first terminals of the resistors 4.1, 4.2 and 4.3, two power amplifiers 5.1 and 5.2, switch 6, recorder 7 and

two additional resistors 8.1 and

80 2

Each threshold thermoconverter (Fig. 2) consists of direct and return wires made of a material whose resistance depends on temperature, for example, nickel, copper, and others. At the same time, the length of each K-th wire thermal converter is longer than the (K-l) -ro thermal converter by an L value equal to the length of the temperature averaging section.

The device works as follows.

The wire thermoconverter 2.1. Forms a series circuit with resistors 8.1 and 4.1 and a current generator 3.1. The wire thermoconverter 2.2 forms a series circuit with resistors 8.2 and 4.2 and generator 3.2 current. These circuits form a bridge circuit, the outputs of which are connected to the input of switch 6 through a decoupling amplifier 5.1.

ten

15

20

the output signal of the bridge circuit at t will be zero.

The wired thermocoupler 2.3 forms a series circuit with a resistor 4.3 and a current generator 3.3 and, together with the wire thermoconverter 2.2 circuit, forms the second bridge circuit, the outputs of which are connected to the input of the switch 6 via the isolating amplifier 5.2. The latter connects the corresponding amplifier 5 to the recording unit 7.

Such an inclusion of wire thermal converters allows the selection of voltages proportional to the resistance and, accordingly, to an average cutoff temperature equal to the length difference L between the first 2.1 and second 2.2, second 2.2 and third 2.3 and so on thermal converters. In the presence of n wire thermocouples. there is (p-1) the mean temperature of medium length sections L located 25 along the length of the entire thermal converter, since the length of the first thermal converter 2.1 is used only to compensate for the supply wires of the second thermal converter.

Claims (1)

Invention Formula A device for measuring the average temperature of medium sections with a non-uniform temperature field, containing a distributed thermoconverter made in the form of a bundle of 5-wire thermocouples, the first outputs of which are connected respectively to the first terminals 40 mi n current generators, the second terminals of which are connected respectively to the first terminals n of the resistors, the switch, the output of which is connected to the recorder, and the inputs are connected to 45 outputs (nl) of decoupling amplifiers, the first inputs of which are connected respectively to the second terminals of the resistors with the exception of the last resistor, the second output of which is connected to the second input (nl) -ro of the decoupling amplifier and the second output of the nth wire thermocouple Ausch; ee so that, in order to improve measurement accuracy thirty 35 50 The magnitude of the resistances of the additional d are introduced into it (p-1) additional resistors 8.1 and 8.2, is selected. resistors, each of which is equal to the resistance of a wire thermal converter with a length L at some initial temperature t. Then between the second terminals of the corresponding wire thermocouples and resistors, the second inputs five 0 the output signal of the bridge circuit at t will be zero. The wired thermocoupler 2.3 forms a series circuit with a resistor 4.3 and a current generator 3.3 and, together with the wired thermocouple circuit 2.2, forms a second bridge circuit, the outputs of which are also connected to the input of the switch 6 via the isolating amplifier 5.2. The latter connects the corresponding amplifier 5 to the recording unit 7. Such inclusion of wire thermocouples allows to select voltages proportional to the resistance and, accordingly, to the average cut-off temperature equal to the length difference L between the first 2.1 and the second 2.2, the second 2.2 and the third 2.3, etc. thermal converters. In the presence of n wire thermocouples. there is (p-1) the mean temperature of medium sections of length L located along the length of the entire thermal converter, since the length of the first thermal converter 2.1 is used only to compensate for the supply wires of the second thermal converter. Invention Formula A device for measuring the average temperature of medium sections with a non-uniform temperature field, containing a distributed thermoconverter made in the form of a bundle of 5-wire thermocouples, the first terminals of which are connected respectively to the first terminals 0 m n current generators, the second terminals of which are connected respectively to the first terminals n of the resistors, the switch, the output of which is connected to the recorder, and the inputs are connected to 5 outputs (nl) of decoupling amplifiers, the first inputs of which are connected respectively to the second terminals of the resistors with the exception of the last resistor, the second terminal of which is connected to the second input (nl) -ro of the decoupling amplifier and the second output of the n-th wire thermocouple converter, e e with the fact that, in order to improve measurement accuracy, 0 five 0 they introduced (n-1) additional resistors, each of which is included between the second terminals of the corresponding wire thermocouples and resistors, the second inputs The amplifiers of the power amplifiers, with the exception of the last one, are connected respectively to the second terminals of the wired converters, with the exception of the first and the last, each wired thermal transducer .2 2.5 Editor M, Petrova Compiled by V.Kulikov Tehred M. Morgental 5553/36 Circulation 776 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab ,, d 4/5 Production and printing company, Uzhgorod, y. Project, 4 The user consists of a straight and return wire, and the length of each K-th wire thermocouple is longer than (K-1) -th wire thermocouple by an L value equal to the length of the averaging segment. 2 Proofreader N.Korol