CA1075572A - Device for indicating the ph value of water in aquariums - Google Patents
Device for indicating the ph value of water in aquariumsInfo
- Publication number
- CA1075572A CA1075572A CA260,508A CA260508A CA1075572A CA 1075572 A CA1075572 A CA 1075572A CA 260508 A CA260508 A CA 260508A CA 1075572 A CA1075572 A CA 1075572A
- Authority
- CA
- Canada
- Prior art keywords
- container
- water
- tube
- aquarium
- air cushion
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 239000007788 liquid Substances 0.000 claims abstract description 33
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 18
- 229910002092 carbon dioxide Inorganic materials 0.000 description 9
- 229920000742 Cotton Polymers 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K63/00—Receptacles for live fish, e.g. aquaria; Terraria
- A01K63/04—Arrangements for treating water specially adapted to receptacles for live fish
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/22—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using chemical indicators
- G01N31/221—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using chemical indicators for investigating pH value
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Biophysics (AREA)
- Animal Husbandry (AREA)
- Molecular Biology (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Marine Sciences & Fisheries (AREA)
- Biochemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Farming Of Fish And Shellfish (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
- Packging For Living Organisms, Food Or Medicinal Products That Are Sensitive To Environmental Conditiond (AREA)
- Investigating Or Analysing Biological Materials (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The present invention provides a device for indicating the pH value of water in an aquarium, comprising a transparent container for an indicator liquid, said container to be dipped into the water of the aquarium said container be provided with a seal which is gas permeable and impermeable to the water of the aquarium when said container is completely submerged there.
The present invention provides a device for indicating the pH value of water in an aquarium, comprising a transparent container for an indicator liquid, said container to be dipped into the water of the aquarium said container be provided with a seal which is gas permeable and impermeable to the water of the aquarium when said container is completely submerged there.
Description
10755~
The present invention relates to a device for indi-cating the pH value of water in a~uariums. In particular the present invention relates to such a device which comprises a transparent container for an indicator liquid and can be dipped into the water in aquariums.
If the water in aquariums is brought into contact with an indicator liquid, then the pH value can be determined from the change in colour of the liquid. However, for this purpose it was required heretofore to take a sample of the water in aquariums and to put it into a container filled with the indicator liquid. Thus, from time to time samples must be taken from the aquarium in order to control the pH value.
It has been found that the pH value in the water of aquariums is a function of the CO2 contained therein. Therefore, for a determination of the pH value of water in aquariums it is sufficient to control the CO2 content of the water or to use the gaseous carbon dioxide contained therein for the determination of the pH value.
The present invention provides a device suitable for these purposes.
According to the present invention there is provided a device for indicating the pH value of water in an aquarium, comprising a transparent container ~or an indicator liquid, said Con-ta in~
contian~r to be dipped into the water, of the aquarium, said container be provided with a seal which is gas permeable and impermeable to the water of the aquarium when said container is completely submerged there.
In the device according to the present invention the container has a seal which is gas permeable and impermeable to water in the completely immersed state. Therefore, water of an aquarium cannot mix with the indicator liquid but only gaseous carbon dioxide can contact it. The indicator liquid is thus not diluted by the water of an aquarium. The seal suitably is an , ` 1075S7'Z
air cushion, which can be inserted between the indicator liquid and a container lid which is permeable to gas, so that the indicator liquid does not wet the lid itself. The risk that the lid will become permeable to the water in an aquarium in the course of time is thus avoided. However, the seal can also consist merely of a lid permeable to gas.
In order to be able to properly detect the change in colour of the indicator liquid, it is advantageous to install e.g. a rod-shaped reflector in the transparent container. The colour of the indicator liquid can then be seen distinctly although water of the aquarium is still between the observer and the indicator liquid.
The present invention will be further illustrated by way of the accompanying drawings in which Figures 1 to 7 are vertical sections through devices according to various embodiments of the present invention.
The device according to Figure 1 comprises a small transparent tube 1, a fixed bottom 2 and a reflecting rod 3 inside the tube. The reflecting rod 3 can also be in the form of an illuminating tube.
The upper end of the tube 1 is provided with a lid 4, which is permeable to gas, for example, a diaphragm which is permeable to gas, or a very fine fabric. However, no water enters the tube 1 through this lid. The tube 1 is filled with an indicator liquid 5 to a level closely below the lid 4, so that an air cushion 6 remains between the level of the indicator liquid and the lid 4.
- In the embodiment according to Fig. 2 the device ansparen~;
~ ~, comprises a small ~ra~are~t tube 7, at the centre of which a ; further small tube 8 is installed. The tube 8 contains indicator liquid 9 and communicates with the interior space of the tube 7 by way of orifices 10, which are above the level of the indi-cator liquid. A stopper 11 closes the orifice for admitting
The present invention relates to a device for indi-cating the pH value of water in a~uariums. In particular the present invention relates to such a device which comprises a transparent container for an indicator liquid and can be dipped into the water in aquariums.
If the water in aquariums is brought into contact with an indicator liquid, then the pH value can be determined from the change in colour of the liquid. However, for this purpose it was required heretofore to take a sample of the water in aquariums and to put it into a container filled with the indicator liquid. Thus, from time to time samples must be taken from the aquarium in order to control the pH value.
It has been found that the pH value in the water of aquariums is a function of the CO2 contained therein. Therefore, for a determination of the pH value of water in aquariums it is sufficient to control the CO2 content of the water or to use the gaseous carbon dioxide contained therein for the determination of the pH value.
The present invention provides a device suitable for these purposes.
According to the present invention there is provided a device for indicating the pH value of water in an aquarium, comprising a transparent container ~or an indicator liquid, said Con-ta in~
contian~r to be dipped into the water, of the aquarium, said container be provided with a seal which is gas permeable and impermeable to the water of the aquarium when said container is completely submerged there.
In the device according to the present invention the container has a seal which is gas permeable and impermeable to water in the completely immersed state. Therefore, water of an aquarium cannot mix with the indicator liquid but only gaseous carbon dioxide can contact it. The indicator liquid is thus not diluted by the water of an aquarium. The seal suitably is an , ` 1075S7'Z
air cushion, which can be inserted between the indicator liquid and a container lid which is permeable to gas, so that the indicator liquid does not wet the lid itself. The risk that the lid will become permeable to the water in an aquarium in the course of time is thus avoided. However, the seal can also consist merely of a lid permeable to gas.
In order to be able to properly detect the change in colour of the indicator liquid, it is advantageous to install e.g. a rod-shaped reflector in the transparent container. The colour of the indicator liquid can then be seen distinctly although water of the aquarium is still between the observer and the indicator liquid.
The present invention will be further illustrated by way of the accompanying drawings in which Figures 1 to 7 are vertical sections through devices according to various embodiments of the present invention.
The device according to Figure 1 comprises a small transparent tube 1, a fixed bottom 2 and a reflecting rod 3 inside the tube. The reflecting rod 3 can also be in the form of an illuminating tube.
The upper end of the tube 1 is provided with a lid 4, which is permeable to gas, for example, a diaphragm which is permeable to gas, or a very fine fabric. However, no water enters the tube 1 through this lid. The tube 1 is filled with an indicator liquid 5 to a level closely below the lid 4, so that an air cushion 6 remains between the level of the indicator liquid and the lid 4.
- In the embodiment according to Fig. 2 the device ansparen~;
~ ~, comprises a small ~ra~are~t tube 7, at the centre of which a ; further small tube 8 is installed. The tube 8 contains indicator liquid 9 and communicates with the interior space of the tube 7 by way of orifices 10, which are above the level of the indi-cator liquid. A stopper 11 closes the orifice for admitting
- 2 -the indicator liquid.
Unlike tube 8, the tube 7 is open at the lower end.
An air cushion 12 is above the water as a seal. This air cushion is permeable to gas but prevents contact between the water in the aquarium and the indicator liquid. A support 13 is mounted on the outside of the tube 7. By means of this support 13 the tube 7 can be secured to the inner wall of an aquarium. The tube 8, like the tube 1 in Fig. 1 can contain a reflecting rod, which is not shown in Fig. 2.
In the embodiment according to Fig. 3 a small trans-parent tube 14, which is closed at both the upper end and the lower end, contains a small tube 15, which is open at its lower end. On its outer wall the tube 15 carries a reflecting coating 17 and thus serves for receiving an air cushion 16 and also as a reflecting rod. The tube 14 is filled with indicator liquid 18 and has orifices 19 adjacent its upper end and above the level of the indicator liquid. Said orifices 19 lead into the tube 15.
Thus, carbon dioxide can get into th~ indicator liqu d and change its colour through the air cushion lG-in the tube 1~. A stopper 20 closes the orifice for admitting the indicator liquid.
The tube 14 also is provided with a support 13, to which a suction cup 21 is secured in order to fasten the device to the wall of an aquarium.
In the embodiment according to Fig. 4 two small tubes 22 and 23 are arranged in juxtaposition and are connectes so as to form a unit. The tube 22 contains indicator liquid 5 and a reflecting rod 3 and the tube 23 is open at the lower end and contains an air cushion. The interior of each of the two tubes 22 and 23 communicate with one another through an orifice 24.
A stopper 25 closes the inlet of the tube 22.
In the embodiment according to Fig. 5 a curved tube 27 filled with indicator liquid 5 extends from one side into a small transparent tube 26. The tube 26 contains an air cushion ., 16 and is open at its lower end. The inlet for the tube 27, provided in the tube 26, is closed with a stopper 25.
The embodiment according to Fig. 6 comprises a small transparent tube 28, which is filled with indicator liquid 5 and has at its lower end a seal 4, which is permeable to gas but impermeable to water. This is practically the same device as that shown in Figure 1 but upside down.
In the embodiment according to Fig. 7 a small tube 29 is open at both ends and carries at each end a seal 30 and 31 respectively. Said seal is permeable to gas but impermeable to water. The gas containing the indicator liquid in the tube 29 flows through the device in the direction of the arrows 32, so that this embodiment provides particularly reliable endurance test data. A stopper 25 closes the inlet for the indicator liquid.
The seal which is permeable to gas can be a film which is permeable to gas such as a Teflon sheet, a trade mark for polytetrafluoroethyline.
The indicator device according to t~he invention uses the CO2 content of the water in aquariums to change the colour of the indicator. In most cases the CO2 gas must first pass through an air cushion before it comes in contact with the indicator.
This measurement is very reliable because above the carbonate hardness l the pH value of water in aquariums is determined only by the CO2 content. The measurement is important since the carbonate hardness of the water in an aquarium must remain stable so that in case of an undesired change of the indicator liquid counter-measures can be taken immediately. Since the device indicates continuously, a glance at the indicating device is sufficient to determine whether or not the pH value of the liquid - 30 is still in the admissible range.
Absorbent cotton impregnated with indicator or filter paper impregnated with indicator can also be put into a tube --" 'io75~7;Z
and the tube with the orifice at the lower end can then be immersed in the water of an aquarium. If this is done correctly, an air bubble remains under the absorbent cotton or filter paper so that the seal is also formed by an air cushion in this case.
The CO2, which possibly changes the colour of the indicator then also passes through the air cushion to the indicator in the absorbent cotton or in the filter paper while the water in the aquarium does not come in contact with the absorbent cotton of filter paper.
Unlike tube 8, the tube 7 is open at the lower end.
An air cushion 12 is above the water as a seal. This air cushion is permeable to gas but prevents contact between the water in the aquarium and the indicator liquid. A support 13 is mounted on the outside of the tube 7. By means of this support 13 the tube 7 can be secured to the inner wall of an aquarium. The tube 8, like the tube 1 in Fig. 1 can contain a reflecting rod, which is not shown in Fig. 2.
In the embodiment according to Fig. 3 a small trans-parent tube 14, which is closed at both the upper end and the lower end, contains a small tube 15, which is open at its lower end. On its outer wall the tube 15 carries a reflecting coating 17 and thus serves for receiving an air cushion 16 and also as a reflecting rod. The tube 14 is filled with indicator liquid 18 and has orifices 19 adjacent its upper end and above the level of the indicator liquid. Said orifices 19 lead into the tube 15.
Thus, carbon dioxide can get into th~ indicator liqu d and change its colour through the air cushion lG-in the tube 1~. A stopper 20 closes the orifice for admitting the indicator liquid.
The tube 14 also is provided with a support 13, to which a suction cup 21 is secured in order to fasten the device to the wall of an aquarium.
In the embodiment according to Fig. 4 two small tubes 22 and 23 are arranged in juxtaposition and are connectes so as to form a unit. The tube 22 contains indicator liquid 5 and a reflecting rod 3 and the tube 23 is open at the lower end and contains an air cushion. The interior of each of the two tubes 22 and 23 communicate with one another through an orifice 24.
A stopper 25 closes the inlet of the tube 22.
In the embodiment according to Fig. 5 a curved tube 27 filled with indicator liquid 5 extends from one side into a small transparent tube 26. The tube 26 contains an air cushion ., 16 and is open at its lower end. The inlet for the tube 27, provided in the tube 26, is closed with a stopper 25.
The embodiment according to Fig. 6 comprises a small transparent tube 28, which is filled with indicator liquid 5 and has at its lower end a seal 4, which is permeable to gas but impermeable to water. This is practically the same device as that shown in Figure 1 but upside down.
In the embodiment according to Fig. 7 a small tube 29 is open at both ends and carries at each end a seal 30 and 31 respectively. Said seal is permeable to gas but impermeable to water. The gas containing the indicator liquid in the tube 29 flows through the device in the direction of the arrows 32, so that this embodiment provides particularly reliable endurance test data. A stopper 25 closes the inlet for the indicator liquid.
The seal which is permeable to gas can be a film which is permeable to gas such as a Teflon sheet, a trade mark for polytetrafluoroethyline.
The indicator device according to t~he invention uses the CO2 content of the water in aquariums to change the colour of the indicator. In most cases the CO2 gas must first pass through an air cushion before it comes in contact with the indicator.
This measurement is very reliable because above the carbonate hardness l the pH value of water in aquariums is determined only by the CO2 content. The measurement is important since the carbonate hardness of the water in an aquarium must remain stable so that in case of an undesired change of the indicator liquid counter-measures can be taken immediately. Since the device indicates continuously, a glance at the indicating device is sufficient to determine whether or not the pH value of the liquid - 30 is still in the admissible range.
Absorbent cotton impregnated with indicator or filter paper impregnated with indicator can also be put into a tube --" 'io75~7;Z
and the tube with the orifice at the lower end can then be immersed in the water of an aquarium. If this is done correctly, an air bubble remains under the absorbent cotton or filter paper so that the seal is also formed by an air cushion in this case.
The CO2, which possibly changes the colour of the indicator then also passes through the air cushion to the indicator in the absorbent cotton or in the filter paper while the water in the aquarium does not come in contact with the absorbent cotton of filter paper.
Claims (11)
EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A device for indicating the pH value of water in an aquarium, comprising a transparent container for an indicator liquid, said container to be dipped into the water of the aquarium, said container being provided with a seal which is gas permeable and impermeable to the water of the aquarium when said container is completely submerged therein.
2. A device according to claim 1, in which the seal is a lid at the upper end of the container.
3. A device according to claim 1, in which the seal is a lid at the lower end of the container.
4. A device according to claim 1, in which a gas permeable lid is provided at both ends of the tube-like container.
5. A device according to claim 1, in which the container has a section containing an air cushion as a seal between an orifice and the indicator liquid.
6. A device according to claim 1,2 or 3 in which the transparent container contains a rod-shaped reflector.
7. A device according to claim 1, in which the container consists of two portions, one portion containing the indicator liquid and the other portion containing an air cushion.
8. A device according to claim 7, in which the container portion containing the air cushion is open at its lower end.
9. A device according to claim 7, in which the container portion containing the air cushion has an opaque wall.
10. A device according to claim 9, in which the container portion containing the air cushion is disposed within the container portion containing the indicator liquid.
11. A device according to claim 2 or 3, which is provided with a support and a suction cup.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE7527913 | 1975-09-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1075572A true CA1075572A (en) | 1980-04-15 |
Family
ID=6655231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA260,508A Expired CA1075572A (en) | 1975-09-04 | 1976-09-03 | Device for indicating the ph value of water in aquariums |
Country Status (11)
| Country | Link |
|---|---|
| JP (1) | JPS5241590A (en) |
| AU (1) | AU1740376A (en) |
| BE (1) | BE845858A (en) |
| CA (1) | CA1075572A (en) |
| CH (1) | CH594886A5 (en) |
| DK (1) | DK400676A (en) |
| ES (1) | ES234152Y (en) |
| FR (1) | FR2323142A1 (en) |
| IT (1) | IT1064953B (en) |
| NL (1) | NL186197C (en) |
| SE (1) | SE429066B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4041107A1 (en) * | 1990-12-21 | 1992-07-02 | Langenbruch Paul Friedrich Dr | Tube for continuous, long-term pH measurement - in liquids of gas permeable, indicator-impermeable material |
-
1976
- 1976-08-26 CH CH1082476A patent/CH594886A5/xx not_active IP Right Cessation
- 1976-09-02 AU AU17403/76A patent/AU1740376A/en not_active Expired
- 1976-09-02 SE SE7609702A patent/SE429066B/en not_active IP Right Cessation
- 1976-09-03 DK DK400676A patent/DK400676A/en not_active Application Discontinuation
- 1976-09-03 CA CA260,508A patent/CA1075572A/en not_active Expired
- 1976-09-03 NL NL7609851A patent/NL186197C/en not_active IP Right Cessation
- 1976-09-03 BE BE170359A patent/BE845858A/en not_active IP Right Cessation
- 1976-09-03 JP JP10505676A patent/JPS5241590A/en active Granted
- 1976-09-03 ES ES1976234152U patent/ES234152Y/en not_active Expired
- 1976-09-03 IT IT2688676A patent/IT1064953B/en active
- 1976-09-06 FR FR7626814A patent/FR2323142A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| SE7609702L (en) | 1977-03-05 |
| NL7609851A (en) | 1977-03-08 |
| JPS5631539B2 (en) | 1981-07-22 |
| DK400676A (en) | 1977-03-05 |
| BE845858A (en) | 1976-12-31 |
| ES234152U (en) | 1978-04-01 |
| NL186197C (en) | 1990-10-01 |
| FR2323142A1 (en) | 1977-04-01 |
| JPS5241590A (en) | 1977-03-31 |
| IT1064953B (en) | 1985-02-25 |
| AU1740376A (en) | 1978-03-09 |
| NL186197B (en) | 1990-05-01 |
| ES234152Y (en) | 1978-08-16 |
| CH594886A5 (en) | 1978-01-31 |
| SE429066B (en) | 1983-08-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |