SU336578A1 - METHOD FOR DETERMINING THE COMPOSITION OF BINARY MIXTURES - Google Patents
METHOD FOR DETERMINING THE COMPOSITION OF BINARY MIXTURESInfo
- Publication number
- SU336578A1 SU336578A1 SU1611370A SU1611370A SU336578A1 SU 336578 A1 SU336578 A1 SU 336578A1 SU 1611370 A SU1611370 A SU 1611370A SU 1611370 A SU1611370 A SU 1611370A SU 336578 A1 SU336578 A1 SU 336578A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- composition
- determining
- time
- binary mixtures
- mixture
- Prior art date
Links
- 239000000203 mixture Substances 0.000 title description 17
- 238000010438 heat treatment Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 239000004020 conductor Substances 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000003287 optical Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000012085 test solution Substances 0.000 description 1
Description
Изобретение относитс к определению состава жидких смесей.The invention relates to the determination of the composition of liquid mixtures.
Известны способы определени состава жидких смесей, основанные на различи х химических , оптических, электрических и других свойств компонентов смеси.Methods are known for determining the composition of liquid mixtures based on the differences in chemical, optical, electrical, and other properties of the components of the mixture.
Недостатками этих методов вл ютс мала чуаствительность и точность, а также отсутствие универсальности.The disadvantages of these methods are low sensitivity and accuracy, as well as the lack of universality.
Цель изобретени - повышение чувствительности и точности анализа.The purpose of the invention is to increase the sensitivity and accuracy of the analysis.
Цель достигаетс тем, что -по предлагаемому способу пробы анализируемой жидкой смеси нанос т на чувствительный элемент, измер ют врем его нагрева до определенной температуры и -по зависимости времени нагрева от состава определ ют концентрацию анализируемой смеси.The goal is achieved by the fact that, according to the proposed method, samples of the analyzed liquid mixture are applied to a sensitive element, the time of its heating to a certain temperature is measured, and the concentration of the analyzed mixture is determined according to the heating time.
.Важнейшей характеристикой чувствительного элемента вл етс зависимость времени нагрева его до фиксированной температуры от теплоты, затраченной на удаление нанесенной на его поверхность анализируемой смеси. Количество теплоты, затраченное на удаление жидкой смеси, онредел етс теплоемкостью смеси и теплотой ее испарени .The most important characteristic of a sensitive element is the dependence of its heating time to a fixed temperature on the heat spent on removing the analyzed mixture deposited on its surface. The amount of heat expended in removing the liquid mixture is determined by the heat capacity of the mixture and its heat of evaporation.
ют затем дл определени концентрации анализируемого раствора.then to determine the concentration of the test solution.
Принцип действи измерительной схемы заключаетс в том, что В момент подачи напр жени :на мост Уитстона, одним из ллеч которого вл етс чувствительный элемент, включаетс система счета времени. На лроводниках выдел етс джоулево тепло, и их температура повышаетс . Все проводники моста, кроме чувствительного элемента, выполнены из сплавов, дл которых температурный коэффициент сопротивлени равен нулю.The principle of operation of the measuring circuit is that at the time of applying a voltage: a system for counting time is turned on to a Wheatstone bridge, one of the elements of which is a sensitive element. Joule heat is released on the conductors and their temperature rises. All the bridge conductors, except for the sensing element, are made of alloys for which the temperature coefficient of resistance is zero.
В результате изменени температуры чувствительного элемента, который изготовлен изAs a result of the temperature change of the sensing element, which is made of
проводника с большим температурным коэффициентом , измен етс его сопротивление, и в момент определенной разницы напр жений в диагонали моста счет времени лрекраш ,аетс .a conductor with a large temperature coefficient, its resistance changes, and at the time of a certain difference in voltage across the bridge diagonal, the time lrekras is measured.
Таким образом измер ют врем нагрева чувствительного элемента до заданной температуры , котора определ етс значени ми остальных сопротивлений моста.Thus, the time of heating the sensing element to a predetermined temperature, which is determined by the values of the remaining resistances of the bridge, is measured.
Предмет изобретени Subject invention
Способ определени состава бинарных смесей , отличающийс тем, что, с целью повышени чувствительности и точности, определенную дозу анализируемой жидкой смеси нанос т :на чувствительный элемент, измер ют вре3 м его нагрева до фиксированной температуры выше температур кипени компонентов при подведении к чувствительному элементу за4 данной мощности и по зависимости времени нагрева от состава определ ют концентрацию анализируемой смеси.The method of determining the composition of binary mixtures, characterized in that, in order to increase sensitivity and accuracy, a certain dose of the analyzed liquid mixture is applied: on the sensitive element, the time of its heating to a fixed temperature above the boiling point of the components is measured when leading to the sensitive element power and the concentration of the analyzed mixture are determined from the dependence of heating time on the composition.
Publications (1)
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