DE901963C - Filling liquid for low temperature thermometer - Google Patents
Filling liquid for low temperature thermometerInfo
- Publication number
- DE901963C DE901963C DEB17192A DEB0017192A DE901963C DE 901963 C DE901963 C DE 901963C DE B17192 A DEB17192 A DE B17192A DE B0017192 A DEB0017192 A DE B0017192A DE 901963 C DE901963 C DE 901963C
- Authority
- DE
- Germany
- Prior art keywords
- filling liquid
- low temperature
- temperature thermometer
- isopentane
- mixture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K5/00—Measuring temperature based on the expansion or contraction of a material
- G01K5/02—Measuring temperature based on the expansion or contraction of a material the material being a liquid
- G01K5/04—Details
- G01K5/12—Selection of liquid compositions
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Liquid Crystal Substances (AREA)
Description
Füllflüssigkeit für Tieftemperaturthermometer Zum Füllen von Tieftemperaturthermometern hat man bisher in der Regel Pentan verwendet. Dieses ist jedoch nur für Thermometer geeignet, die für Temperaturen bis zu - 1600 verwendet werden, weil bei tieferer Temperatur in dem Pentan Kristallbildung eintritt.Filling liquid for cryogenic thermometers For filling cryogenic thermometers up to now, pentane has generally been used. However, this is only for thermometers suitable, which are used for temperatures up to - 1600, because at lower Temperature at which pentane crystal formation occurs.
Es wurde nun gefunden, daß eine Mischung aus Isopentan (2-Methylbutan) mit einem oder mehreren Isohexanen und bzw. oder Isoheptanen sich auch für solche Thermometer als Füllflüssigkeit verwenden läßt, die bei Temperaturen bis zu -@ 200° benutzt werden sollen. Man mischt dem Isopentan zweckmäßig 10 bis 90 % Isohexan oder Isoheptan oder eines Gemisches aus diesen Stoffen zu. Am geeignetsten sind Gemische, die, auf Isopentan bezogen, 10 bis 20 % Isohexan oder Isoheptan oder eines Gemisches dieser Stoffe enthalten. Kleine Mengen Cyclopentan stören in der Mischung nicht, dagegen soll die Anwesenheit von n-Pentan, 2, 2-Dimethylpropan und n-Hexan vermieden werden. It has now been found that a mixture of isopentane (2-methylbutane) with one or more isohexanes and / or isoheptanes are also suitable for such Thermometer can be used as filling liquid, which can be used at temperatures up to - @ 200 ° should be used. It is advisable to mix 10 to 90% isohexane with the isopentane or isoheptane or a mixture of these substances. Are most suitable Mixtures that, based on isopentane, 10 to 20% isohexane or isoheptane or one Contain a mixture of these substances. Small amounts of cyclopentane interfere with the mixture not, but the presence of n-pentane, 2,2-dimethylpropane and n-hexane should be be avoided.
Beispiele geeigneter Mischungen, aus denen bis -200° keine Kristalle abgeschieden werden, sind I. 8o g Isopentan (Sdp. 28, n,D, = 1,3537), 20 g 2-Methylpentan (Sdp. 60,3°, n20D=1,3715). Examples of suitable mixtures from which no crystals up to -200 ° are deposited are I. 80 g of isopentane (bp. 28, n, D, = 1.3537), 20 g of 2-methylpentane (Bp 60.3 °, n20D = 1.3715).
Statt des 2-Methylpentans kann die gleiche Menge 3-Methylpentan (Sdp. 630, n20D= I,3763) oder 2, 3-Dimethylbutan (Sdp. 58°, n200 1,3750) verwendet werden. Instead of 2-methylpentane, the same amount of 3-methylpentane (bp. 630, n20D = 1,3763) or 2,3-dimethylbutane (bp 58 °, n200 1.3750) can be used.
2. 80 g Isopentan, 10 g 2-Methylpentan, 10 g 3-Methylpentan. 2. 80 g isopentane, 10 g 2-methylpentane, 10 g 3-methylpentane.
3. 80 g einer durch sorgfältige Fraktionierung gewonnenen, von 27,5 bis 29° siedenden Isopentanfraktion und 20 g einer von 57 bis 63,5° siedenden Isohexanfraktion. 3. 80 g of a 27.5 obtained by careful fractionation isopentane fraction boiling up to 29 ° and 20 g of an isohexane fraction boiling from 57 to 63.5 °.
4. 80 g Isopentan, 20 g einer von go bis 92° siedenden, 2- und 3-Methylhexan enthaltenden Fraktion (nD20 = I,3870). 4. 80 g of isopentane, 20 g of 2- and 3-methylhexane boiling from 0 to 92 ° containing fraction (nD20 = I, 3870).
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB17192A DE901963C (en) | 1951-10-17 | 1951-10-17 | Filling liquid for low temperature thermometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB17192A DE901963C (en) | 1951-10-17 | 1951-10-17 | Filling liquid for low temperature thermometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE901963C true DE901963C (en) | 1954-01-18 |
Family
ID=6959215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEB17192A Expired DE901963C (en) | 1951-10-17 | 1951-10-17 | Filling liquid for low temperature thermometer |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE901963C (en) |
-
1951
- 1951-10-17 DE DEB17192A patent/DE901963C/en not_active Expired
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