SU504928A1 - Device for measuring low gas flow rates - Google Patents
Device for measuring low gas flow ratesInfo
- Publication number
- SU504928A1 SU504928A1 SU2074846A SU2074846A SU504928A1 SU 504928 A1 SU504928 A1 SU 504928A1 SU 2074846 A SU2074846 A SU 2074846A SU 2074846 A SU2074846 A SU 2074846A SU 504928 A1 SU504928 A1 SU 504928A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- gas flow
- flow rates
- low gas
- thermistors
- measuring low
- Prior art date
Links
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- Measuring Volume Flow (AREA)
Description
1one
Изобретение относитс к устройствам дл измерени малых расходов газа с помощью термодатчиков.The invention relates to devices for measuring low gas flow rates using temperature sensors.
Известны устройства, содержащие датчик со встроенными терморезисторами пр мого или косвенного подогрева, блок питани и измерительную схему, выполненную по мостовой схеме.Devices are known that contain a sensor with built-in thermistors of direct or indirect heating, a power supply unit, and a measuring circuit, made according to a bridge circuit.
Цель изобретени - повышение чувствительности и точности преобразовани при из .мерении малых расходов газа без усложнени устройства.The purpose of the invention is to increase the sensitivity and accuracy of conversion when measuring small gas flow rates without complicating the device.
Это достигаетс тем, что измерительна схема выполнена в виде работающего в автоколебательном режиме мультивибратора, а в разр дные цепи мультивибратора включены терморезисторы датчика, температурные коэффициенты которых равны по величине и противоположны по знаку.This is achieved by the fact that the measuring circuit is made in the form of a multivibrator operating in the self-oscillating mode, and the thermistors of the sensor are included in the discharge circuits of the multivibrator, whose temperature coefficients are equal in magnitude and opposite in sign.
На фиг. 1 схематически изображен датчнк; на фиг. 2 представлеиа измерительна схема.FIG. 1 shows a schematic diagram of a sensor; in fig. 2 Representation of the measurement scheme.
Датчик содержит корпус I, сопла 2 со штуцерами 3 и 4 дл входа и выхода газа и терморезисторы 5 и 6, паход щиес в одинаковых тепловых услови х.The sensor includes a housing I, nozzles 2 with nozzles 3 and 4 for gas inlet and outlet, and thermistors 5 and 6, which run in the same thermal conditions.
Измерительна схема (фиг. 2) выполнена в виде мультивибратора на транзисторах 7 и 8. В разр дные цепи мультивибратора включены терморезисторы, температурные коэффициеиты которых равны по величине и противоположпы по знаку.The measuring circuit (Fig. 2) is made in the form of a multivibrator on transistors 7 and 8. The discharge circuits of the multivibrator include thermistors, the temperature coefficients of which are equal in magnitude and opposite in sign.
Период колебаний мультивибратора определ етс суммой посто нных времени обеих ценей разр да, в которые включены терморезисторы .The period of oscillation of the multivibrator is determined by the sum of the constant times of both prices of the discharge, in which the thermistors are included.
При расходе газа уменьшаетс температура терморезисторов, увеличиваетс сопротивление одного терморезистора и уменьшаетс сопротивление другого. Период колебаний мультивибратора при этом остаетс посто нным, а измеп етс только длительность импульсов.With gas flow, the temperature of the thermistors decreases, the resistance of one thermistor increases, and the resistance of the other decreases. The oscillation period of the multivibrator remains constant, and only the pulse duration is measured.
Полученный на выходе устройства врем имнульсный сигнал преобразуетс в цифровую форму известными методами.The time signal received at the output of the device is digitized by known methods.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU2074846A SU504928A1 (en) | 1974-11-14 | 1974-11-14 | Device for measuring low gas flow rates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU2074846A SU504928A1 (en) | 1974-11-14 | 1974-11-14 | Device for measuring low gas flow rates |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU504928A1 true SU504928A1 (en) | 1976-02-28 |
Family
ID=20600658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU2074846A SU504928A1 (en) | 1974-11-14 | 1974-11-14 | Device for measuring low gas flow rates |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU504928A1 (en) |
-
1974
- 1974-11-14 SU SU2074846A patent/SU504928A1/en active
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