SU547651A1 - Temperature measuring device - Google Patents

Description

(54) DEVICE FOR TEMPERATURE MEASUREMENT

one

The invention relates to the field of temperature measurement.

Temperature measurement devices are known that contain a variable frequency generator, in whose frequency-dependent circuit 5 a term JY, 2 is included.

Of the known devices, the closest to the technical essence is a device for measuring temperature, containing an RC-generator, in the frequency-dependent 10 circuit of which two resistance thermometers are included, and registering devices of about Gz.

A disadvantage of the known device when using it as a remote temperature meter, for example, building structures J, is the low measurement accuracy due to the instability of the generator elements.

The aim of the invention is to improve the measurement accuracy.

This is achieved by inserting two reference resistors into the device, connected via sequence-25 controlled keys

2

but with a thermometer.: and resistances, dg. The filler of the lighter of the meter conpoTiisneH :: ochennyh through control -; the second keys PL, - -,::; about the main thermometers of the resistance, and the control of the control, to the output of which is;; --- en ;; control inputs.

The drawing shows a diagram of the device. The temperature measurement device contains an RC generator made on an amplifier 1 with a frequency-dependent peppo consisting of capacitors 2 and 3, and typical thermometers with resistance 4 - 7. connected to each other in pair-parallel-controlled keys 8 and 9, identical-at reference resistors 10 and 11, connected in series with rebound thermometers via controlled keys 12 v 13; a control unit containing relays 1L and 15, zener diodes 16 and 17, diode 18, k, power supply 19, 2O.

Amplifier 1 contains feedback depressions 21, 22, a power supply circuit assembled at the Zener diode 23 and a resistance 24, an output circuit assembled at the capacitor 25 and a resistor 26.

A measuring and recording device is connected via a communication line to terminals 11, 28.

The device works as follows.

The process of temperature measurement is mz three cycles.

In the first cycle, a DC control voltage of + 15V is applied along the communication line to terminal 28. A-15 V to terminal 27 of the device circuit.

Relays 14 and 15 are de-energized. The generator circuit is powered via normally-closed contacts 19, 20 of relay 14. The normal io closed contacts 12, 13 of the relay 15 provide for the removal of the reference resistors 10, 11 from the frequency-dependent circuit, and the norm. razomk1; utg, 1e pins 8 and 9 relays 14:) G -;: l och; 1YuT thermometry sog; rOTPVLenl 5 and O; h;: DONE - For 1C-:::; th

chains.

In the first tact of the chastol-ziv / gkka, it consists of 2, 3 m censor switches: dm-cDripoTiiBJieiiHfl 4.6.

Owing to the identity of the thermometers with the resistance, the period of the out-of-signal signal in tact is equal to or the error t: t + .j-Vi / j

rtJe k - KoadijiimneHT proportionality

between the measured temperature tL and the value of the resistance C of the thermometer (}) s; sensitivity of the device, changing the period of the output signal of the sensor by a unit of change in the input signal - match) TiB, 11 of the thermometer; j - the epoch of the period. The accuracy of the temperature measured by the temperature is determined by the parameter LN d and b, which is not possible; cs ;: stats, as they change under the influence of gcneil conditions.

In Biopox: T / iKTt in the polarity that lnp erlolt tt; kte. a constant nair is given;.; x;: m ;; e H21 s, koggroo nrob (vat stabl.; P: pO}; 17. -H; that Th Syabt L p: e1, CONNECT THROUGH congat; l2, 13 сsletsovmtlno with tarmometa ;; m coiijJOTuiUieHHK 4 j: (S standard1; and: o X) g: p; -t ;; vle1; 1JO and II.

In 2: Go; - .: TaKfe lerioho vyhohog CKrua.ua is associated with a frost ate at a temperature of

(

f2)

Lenny 10, 11. In the third cycle, the control voltage of the control voltage of the MON

the relay 14 is triggered and the relay 15 is turned off. The reference resistances are turned off, and contacts 8 and 9 are connected in parallel with the resistance thermometers 4 and 6 and the resistance thermometers 5 and 7. The output signal period is equal to

ki, (3)

.

The measured temperature is determined by solving the equations (1), (2), (3) by eliminating the parameters q and b.

(four)

aR

at

The temperature calculation operation is performed by a measuring-registering device (not shown in the drawing), connected via a communication line to terminals 27, 28.

The accuracy of the temperature measurement is actually determined by the resistance thermometer class and does not depend on the generator parameters.

Ф о рм у л and II о б р е

et e and

A temperature measurement device containing a RC - generator with volt resistance thermometers in a frequency dependent circuit, a measuring and recording device, characterized in that, in order to improve the accuracy of temperature measurement, an automatic reference resistor included in it Led keys in series with resistance thermometers, two additional resistance thermometers connected via controllable keys in parallel to the main resistance thermometers, and a control unit whose output is connected Yucheny vhotsy managed keys.

Sources of information taken into account during the examination:

1. Authors' Soviet Union Inscription No. 210423, M. Kl.S, 01 K from 18.O1.67.

2. USSR author's certificate K'.444952, M. Kl Q O1 K 7/34 dated 12.27.72.

3.Turigin .A., M. Electrical measurements of non-electrical quantities. M.-L., Energia, 1966, p.539, fig.26-5 (prototype).

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